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Snowkit PDF
Merge, split, compress, convert, sign and scan PDFs.
All-in-one
Edit text
Combine and split
Merge PDFCombine several PDF files into one in your browser.Split PDFSplit a PDF into separate files by page ranges, pull out selected pages, or save every page on its own.Images to PDFCombine JPG, PNG and WebP pictures into a single PDF in your browser.Extract pages from PDFPick pages or ranges such as 2-5, 9 and save them as one new PDF, or one PDF per range.
Scan
Convert
PDF to WordTurn PDFs into editable Word documents or plain text.PDF to textExtract all the text from a PDF as a plain .txt file.Word to PDFTurn Word documents into clean PDFs with lists, tables and pictures.PDF to JPGConvert PDF pages to JPG images at 72, 150 or 300 DPI.Markdown to PDFTurn Markdown into a clean typeset PDF with selectable text, live page preview and page sizes.HTML to PDFConvert pasted HTML or an .html file into a PDF with real, selectable text and a live preview.Extract images from PDFPull the photos and pictures out of a PDF at their original size and save them as PNG files or one ZIP.PDF to PDF/AMake an archive copy of a PDF with PDF/A-2b metadata, a colour profile and scripts removed.Translate PDFTranslate a PDF on your device and keep the page layout.
Sign and fill
Sign PDFFill in forms and add your signature, text, dates and check marks.Fill PDF formType into PDF form fields, tick boxes and pick options in your browser, then download the filled form.Add text to PDFType text anywhere on a PDF, add dates and check marks, then download.Flatten PDFMake form fields, comments and stamps a permanent part of the page, or turn pages into images.PDF annotatorHighlight, strike out, draw, add notes, boxes and arrows, then save as comments or flatten.Contract templatesFill in a service agreement, mutual NDA or room rental, download the PDF and sign it.Make PDF fillableAdd text boxes, checkboxes, dropdowns and signature boxes to a PDF so anyone can fill it in.
Edit pages
Rotate PDFRotate one page or a whole PDF left or right and save it.Delete PDF pagesRemove unwanted pages from a PDF in your browser.Reorder PDF pagesRearrange the pages of a PDF by dragging thumbnails or using arrow buttons, then save.Page numbers and watermarksNumber PDF pages, add headers and footers, or stamp a watermark.Add page numbers to PDFNumber the pages of a PDF in your browser.Watermark PDFStamp a text watermark such as DRAFT, CONFIDENTIAL or COPY across every page of a PDF, in your browser.Crop PDFCrop PDF pages with a box, or trim white margins automatically, on any set of pages.PDF basicsExtract images, make a PDF grayscale, change the page size, edit its details or shrink it to a size.Change PDF page sizeResize PDF pages to A4, US Letter, Legal, A3 or A5, scaling the content to fit with text kept sharp.Grayscale PDFTurn a colour PDF into grayscale for printing or sharing.PDF booklet and pages per sheetPrint 2, 4, 6 or 9 pages on each sheet, or fold the pages into a booklet in the right order.PDF booklet makerRearrange a PDF so it prints as a folded booklet with the pages in the right order.Pages per sheet PDFPut 2, 4, 6 or 9 PDF pages on each sheet of A4 or Letter to save paper.
Protect and compare
Redact PDFBlack out words and areas in a PDF, removing the hidden text for good.Compare PDFCompare two PDFs page by page and see every added and removed word side by side.Protect PDFLock a PDF with a password and AES-256 encryption, with optional print and copy limits.Unlock PDFRemove the password from your own PDF when you know it, and save a copy that opens freely.Repair PDFFix damaged PDFs that will not open, and see a plain list of exactly what was repaired.Edit PDF metadataSee and change a PDF's title, author, subject, keywords and creator, or clear them all before you share it.
Office files
PDF to ExcelPull tables out of PDFs into Excel workbooks or CSV files, page by page.PDF to CSVPull the tables out of a PDF into a CSV file in your browser.Excel to PDFTurn Excel, OpenDocument and CSV sheets into tidy, printable PDF tables.CSV to PDFTurn a CSV file into a tidy, printable PDF table in your browser, with gridlines, page numbers and the header row on every page.PowerPoint to PDFTurn PowerPoint slides into a PDF with text, shapes, pictures and tables.PDF to PowerPointTurn PDF pages into PowerPoint slides, with an optional editable text layer.Mail mergeOne letter with fields plus a spreadsheet gives a PDF page or a separate PDF for every row.Certificate makerDesign one certificate and get a PDF with a page for every name on your list.
Snowkit Studio
Convert, resize, compress and record images, video and audio.
All-in-one
Snowkit StudioEdit photos on one canvas: crop, adjust, add text and stickers, and export for every platform.Add text to photoPut a caption, title or label on any photo, choose the font, colour, outline and box, then save it as JPG, PNG or WebP.Image converterConvert and resize PNG, JPG and WebP right in your browser.Meme makerTop text, bottom text, done in seconds on your own device.Video and audioConvert, compress, trim and turn videos into GIFs, all on your device.
Make for social
Social export packOne photo or video to every platform size in one zip.Thumbnail makerYouTube thumbnails with big text, safe zones and your colours.Carousel makerSlice a wide image or build text slides at 1080 x 1350, as a zip or PDF.Burn in captionsBurn SRT or VTT subtitles into a video in a style you choose.
Print for your business
Flyer makerFlyers and posters in A4, Letter or A3 with your logo and colours.Menu makerMenus and price lists with sections, prices, your branding and a QR code.Price tag sheetPrice tags and shelf labels from a spreadsheet, with barcodes, on label sheets.Voucher makerGift cards and vouchers with serial numbers and QR codes, plus a CSV of serials.
Edit photos
Photo editorCrop, rotate, straighten, adjust, filter and watermark a photo, then save JPG, PNG or WebP.Crop image to squareCrop any photo to a perfect 1:1 square for profile pictures and posts.Add watermark to photoPut your name or website on a photo as a text watermark.Collage makerPut 2 to 9 photos into a grid, strip or mosaic sized for posts, stories or banners.GIF makerTurn photos or a short video clip into an animated GIF, with size shown before you save.Image colour pickerPick exact colours from any image with a loupe and export its palette.Crop imageCrop a photo freely or to 1:1, 4:5, 16:9 and other shapes, then save it as JPG, PNG or WebP.Rotate imageRotate a photo 90 degrees left or right, or straighten a tilted horizon with the slider, then save it.Flip imageFlip a photo horizontally to mirror it, or vertically to turn it upside down, then save it as JPG, PNG or WebP.
ID and passport photos
Convert images
HEIC to JPGConvert iPhone HEIC photos to JPG or PNG in batches, privately.JPG to PNGConvert JPG or JPEG images to PNG in your browser, one at a time or in a batch.PNG to JPGTurn PNG images into JPG to cut the file size.WebP to JPGConvert WebP images to JPG in your browser.WebP to PNGConvert WebP to PNG in your browser and keep transparent backgrounds.PNG to WebPConvert PNG images to WebP for faster websites.JPG to WebPConvert JPG photos to WebP to shrink file sizes for websites and shops.Image to SVGTurn a PNG or JPG into a clean SVG with the colours you choose, or save an SVG as PNG or JPG.PNG to SVGTurn a PNG logo, icon or drawing into a clean SVG with the colours you choose.JPG to SVGVectorize a JPG into an SVG with 2 to 32 colours and adjustable smoothing.SVG to PNGSave an SVG as a sharp PNG at 1x, 2x, 4x or any width you type, with a transparent or coloured background.SVG to JPGTurn an SVG into a JPG on a white or coloured background at the size you choose.
Photo privacy
Resize images
Resize image to 1080x1080Resize any picture to exactly 1080 x 1080 pixels for square social posts.Resize image to 1080x1350Resize photos to 1080 x 1350 pixels, the 4:5 portrait size that fills the most space in a feed.Resize image to 1080x1920Resize pictures to exactly 1080 x 1920 pixels, the 9:16 size for stories, reels and shorts.Resize image to 1920x1080Resize pictures to exactly 1920 x 1080 for wallpapers, slides and video thumbnails.Resize image to 1280x720Resize any image to exactly 1280 x 720 pixels, the standard video thumbnail size.Resize image to 1500x500Resize a picture to 1500 x 500 pixels, the 3:1 header and banner size for social profiles.Image resizerResize JPG, PNG and WebP images to an exact width and height, by percent or to fit a box, one at a time or in a batch.Resize image for LinkedIn bannerResize a photo to 1584 x 396 pixels, the 4:1 size for a LinkedIn profile background.Resize image for LinkedIn postResize an image to 1200 x 627 pixels for LinkedIn link and image posts.Resize image for PinterestResize photos to 1000 x 1500 pixels, the tall 2:3 shape that suits Pinterest pins.
Compress images
Convert video
MOV to MP4Convert iPhone and QuickTime MOV videos to MP4 so they play everywhere.MP4 to WebMConvert MP4 to WebM for websites and the web.Video converterConvert MP4, MOV, WebM and MKV videos, or shrink one to a size such as 10 MB, on your device.MKV to MP4Convert MKV videos to MP4 so they play on phones, TVs and editors.
Edit video
Compress videoMake a video file smaller for email, chat or upload limits.Trim videoCut a video down to the part you want.Video to GIFTurn a few seconds of any video into an animated GIF.Merge videosJoin clips into one MP4 or WebM, with trims, matched sizes and optional crossfades.Mute videoRemove the sound from a video, or make it quieter or louder, without touching the picture.Reduce video volumeTurn the sound of a video down or up without touching the picture.Compress video to sizeShrink a video to just under a size limit you choose, such as 10 MB or 25 MB.Video editorCrop, rotate, speed up, slow down or reverse a video, add music and text, all in your browser.Rotate videoTurn a sideways or upside-down video the right way round and save it as an MP4.Crop videoCrop a video to square, vertical 9:16, widescreen 16:9 or 4:5 for social feeds.Speed up videoChange a video's speed from 0.25x slow motion to 4x fast, with voices kept natural.Reverse videoMake a video play backwards, sound included, and save it as an MP4.
Video for social
Record your screen
Audio
MP4 to MP3Turn an MP4 video into an MP3 audio file in your browser.WAV to MP3Convert large WAV recordings to compact MP3 files.Trim audioCut an MP3, WAV or M4A file down to the part you want.Audio converterConvert MP3, WAV, M4A, OGG, FLAC and other audio files in batches, right on your device.M4A to MP3Convert M4A voice memos and music to MP3 in batches.FLAC to MP3Convert large lossless FLAC files to compact MP3 at the quality you choose.BPM and key finderFind the tempo and musical key of a song from a file, or tap along to count the beats.Song key finderDrop in an MP3, WAV or M4A file to estimate its musical key and tempo, analysed on your device.Tap tempoTap a key or the button along with the beat to measure the tempo in beats per minute.Audio clean-upReduce background noise, even out loudness and trim silence on your device.Audio editorJoin audio files, change speed, pitch and volume, add fades and save as WAV or MP3.Change audio speedSpeed up or slow down a song, lecture or voice memo from 0.5x to 2x, with the pitch kept natural.Change pitch of audioMove a song up or down by up to 12 semitones without changing its length, then save as MP3 or WAV.Volume boosterMake a quiet recording louder without distortion, or set the volume by up to 20 dB.Vocal removerSplit a song into an instrumental and a vocal track on your device.Karaoke makerMake a karaoke track by taking the lead vocal out of a song on your device.
Snowkit Write
Check, clean, count, cite and study your writing.
All-in-one
Write better
Outline makerPlan an essay or article section by section with a word budget, then start writing.Essay outline makerOutline an essay from a proven structure: a thesis, body paragraphs, a counterargument and a conclusion, each with its share of the word count.Article outline templatePlan a blog post or article from a ready structure for how-to guides, list articles and product reviews, with a word budget for each section and a reading time.Grammar checkerCheck English grammar, spelling and style privately, on your device.Text to speechHear any text read aloud with natural voices and word-by-word highlighting.Readability checkerFlesch reading ease, grade level, reading time and long sentences for any text.Reading time calculatorFind out how long your text takes to read silently and to say aloud, for blogs, speeches and presentations.Lorem ipsum generatorPlaceholder text by paragraphs, sentences, words or list items, in Latin or plain English.
Count
Clean up
Case converterConvert text to UPPER, lower, Title or Sentence case, or camelCase, snake_case, kebab-case and more.Remove duplicate linesDelete repeated lines from a list and keep the first copy of each, in order.Sort linesSort lines A to Z, Z to A, in natural number order, by length, in reverse or at random, and remove empty or duplicate lines.Find and replace textFind and replace words or patterns in any text, with match case, whole words and regular expressions, and a count of every change.Text cleanerRemove line breaks, extra spaces, empty lines, curly quotes, HTML tags and emoji from pasted text.Remove line breaksRemove line breaks, extra spaces and empty lines from text pasted out of PDFs and emails, keeping paragraphs if you like.Remove emojis from textStrip emoji, flags and pictographs from any text while keeping the words, punctuation and line breaks.Fancy text generatorTurn plain text into bold, italic, script, outline and other Unicode styles you can paste anywhere.Bold text generatorType once and copy bold, bold italic and bold sans letters made from Unicode characters, ready to paste into bios, posts and messages.Cursive text generatorTurn text into cursive and script letters made from Unicode characters, then copy them into a bio, caption or message with one tap.
Compare and format
Cite sources
Citation generatorAPA, MLA, Chicago and Harvard citations and reference lists, with no ads.Research notesSources, quotes and notes in one place, cited in any style and ready to start a draft.Research organizerKeep every source, quote and page number for an essay or article in one place, with APA, MLA, Chicago or Harvard references and a cited first draft.
Jobs
Resume builderAn ATS-friendly one-column resume with live checks, saved as PDF, Word or text.Resume keyword matchCompare your resume with a job post: matched and missing keywords and the job title.Cover letterA tailored cover letter draft from your resume and the job post, with tips, as PDF or Word.Application trackerJob applications from saved to offer, with follow-up reminders for your calendar.
Learn
FlashcardsFlashcards with spaced repetition and easy import from Quizlet or any list.Typing speed testMeasure your words per minute and accuracy with timed tests, and see which keys slow you down.Notes from textStudy notes with headings, a summary and key terms from a transcript or PDF, then flashcards or a quiz.Quiz makerMultiple choice, true or false and short answer quizzes, printed as a test with an answer key.Comment bankReusable feedback comments in categories, ready to copy into any marking tool.
Office
Meeting minutesMinutes with attendees, a summary, decisions and action items from a meeting transcript.Slide makerAn outline or Markdown turned into themed slides to present or save as PDF or PowerPoint.Flowchart makerFlowcharts and mind maps from a few lines of text, edited by clicking, saved as SVG or PNG.
Snowkit Dev
JSON, SQL, encoding, regex, secrets and everyday developer utilities.
All-in-one
JSON and data
JSON formatterFormat JSON with spaces or tabs, minify it, sort keys and browse it as a tree.JSON validatorCheck whether JSON is valid and see the line, column and a plain explanation of any error, like a trailing comma.JSON to CSVTurn a JSON list of objects into CSV for Excel or Google Sheets.CSV to JSONConvert CSV or spreadsheet cells to JSON.JSON to YAMLConvert JSON to clean YAML with risky values quoted for you, or turn YAML with anchors and block text into JSON.JSON toolkitValidate JSON against a schema, test JSONPath queries and generate realistic mock data.JSONPath testerTest JSONPath expressions with filters, slices and recursive search against your own JSON and see matches live.Mock data generatorGenerate realistic fake records from a JSON Schema or a sample object: names, emails, dates, numbers in range and UUIDs, repeatable with a seed.CSV cleanerRemove duplicates and empty rows, trim spaces, split and merge columns and fix dates in a CSV.
Encode and decode
Base64 encode and decodeEncode text to Base64 or decode it back, with full UTF-8, URL-safe Base64 and file to data URL conversion.URL encode and decodePercent-encode a query value or a whole web address, or decode one back to text.JWT decoderDecode a JSON Web Token to read its header and claims, with exp, nbf and iat as dates, and check HS256 signatures.Text to binaryConvert text to binary, hex, octal or decimal codes and back, with full UTF-8 support.Binary to textPaste binary code such as 01101000 01101001 and read it as text.Image to Base64Turn images into Base64 data URLs for HTML and CSS, or decode Base64 back into an image.Base64 to imagePaste a Base64 string or data URL to see the image and download it as PNG, JPG, WebP, GIF or SVG.
Format and minify
Code formatterBeautify or minify HTML, CSS and JavaScript, with the size before and after.HTML formatterPaste messy or minified HTML and get it neatly indented, with inline scripts and styles formatted too.CSS minifierMinify CSS by removing comments, whitespace and unneeded semicolons, and see the size before and after.JavaScript minifierMinify JavaScript by removing comments and whitespace while keeping strings, regular expressions and template literals intact.
Generate
UUID generatorMake random version 4 or time-ordered version 7 UUIDs with secure random numbers, in bulk, and inspect any UUID.Password generatorMake strong passwords or easy-to-type passphrases with your browser's secure random numbers, and see the strength in bits.SHA-256 hash generatorGet the SHA-256 hash of any text or file, plus SHA-1, SHA-512 and MD5, and compare it with a published checksum..gitignore generatorCombine templates for your languages, frameworks, editors and OS into one tidy .gitignore.MD5 hash generatorGet the MD5 checksum of any text or file, with SHA-1, SHA-256 and SHA-512 alongside, and compare it with a published value.README generatorWrite a README or a changelog from a short form, ready as Markdown.Changelog generatorWrite a CHANGELOG.md in Keep a Changelog format from a short form or your commit messages, with compare links for each version.Env example generatorTurn a .env file into a .env.example with the values removed and the comments kept.Screenshot beautifierAdd a background, padding, rounded corners, a shadow, a browser frame and notes to a screenshot.Browser mockup generatorPut any screenshot in a clean browser window with your own address, add a background, padding and shadow, and save a PNG.
Test and convert
Regex testerTest a JavaScript regular expression with every match highlighted, numbered and named groups, and a live replace preview.Unix timestamp converterConvert a Unix timestamp to a date in any time zone, or a date to a timestamp.cURL converterTurn a cURL command into JavaScript fetch, Python requests, Go or PHP code.Format converterConvert between JSON, YAML, TOML, XML and .env in any direction, with line-numbered errors.Colour converterConvert HEX, RGB, HSL, HSV and OKLCH, build tints and shades, and check WCAG contrast.Contrast checkerCheck the contrast ratio between text and background colours against WCAG AA and AAA, see a live preview, and get the closest passing colour.
Inspect and protect
Databases and SQL
SQL playgroundQuery CSV, JSON and SQLite files with SQL, then export the results.SQLite viewerOpen SQLite database files in your browser, browse tables, run SQL and export results.Query CSV with SQLTurn CSV and JSON files into tables and query them with SQL in your browser.SQL formatterBeautify or minify SQL: joins, CTEs, subqueries, CASE, INSERT, UPDATE and CREATE TABLE.
Types and schemas
Snowkit AI
Private AI that runs on your own device, and tools for working with AI.
Edit photos
Background removerCut out people, products and pets with private AI on your device.Photo upscalerEnlarge photos 2x or 4x with AI that runs on your device. Sharper edges, no upload.Object eraserBrush over people, signs or blemishes and erase them from photos, on your device.Blur backgroundBlur the background of a photo and keep the subject sharp, with the AI running on your device.Change background colourPut the subject of a photo on a new colour, gradient or picture, made on your device.White background for photoPut a product or person on a clean white background for shops, marketplaces and profiles.
Read text
Image to textCopy the text out of photos, screenshots and scanned PDFs, privately.OCR PDFRead the text from scanned PDFs page by page and copy it out.Receipt to textSnap a receipt and get the shop, date, items, tax and total as CSV or JSON, privately.Ask a PDFAsk questions of a PDF and get the best matching passages with page links, all on your device.
Transcribe speech
Speech to textTranscribe lectures, meetings and videos into text and subtitles, privately.Subtitle generatorCreate SRT and WebVTT subtitles for your videos automatically with AI in your browser.Lecture recorderRecord lectures with a live level meter, save the audio and transcribe it on your device.Voice recorderRecord your voice or a meeting in your browser with a live level meter, pause and resume, then save WebM or WAV.
Write with AI
AI summarizerGet the key points of any text with your browser's built-in AI, or by picking key sentences.AI rewriterRewrite text more formal, more casual, shorter or longer with your browser's built-in AI.AI translatorTranslate text with your browser's built-in, on-device translator. Your words stay private.
Work with AI
Markdown converterTurn PDFs, Word files, web pages and pasted text into clean Markdown.Token counterExact token counts for OpenAI models, context window fit and cost.AI cost estimatorEstimate tokens and cost for GPT, Claude, Gemini and Llama models with your own prices.Redact textRemove names, emails, numbers and keys from text before sharing it or using AI.Reversible redactionSwap names, emails and numbers for labels before using AI, then put the real values back in the reply.Prompt librarySave prompts with {{variables}} and versions, fill them in and copy.Compare AI answersPut two to four AI answers side by side with a word diff, lengths and a scoring table.AI text chunkerSplit text, Markdown or PDF text into overlapping chunks by tokens or characters and export JSONL.
Build with AI
Function schema builderBuild tool definitions visually and export them in every common tool format, MCP included.MCP testerConnect to an MCP server over HTTP or SSE, list its tools and call them, with the raw JSON-RPC.JSONL dataset builderBuild chat or completion JSONL datasets from CSV or a form and check every line.Jsonl validatorCheck a JSONL training or eval file line by line: invalid JSON, missing messages, empty answers, wrong roles and duplicates.AI answer schema checkCheck a batch of AI JSON answers against a JSON Schema, with a report for each answer.
Snowkit Calc
Calculators, statistics, number converters and charts.
All-in-one
Snowkit CalcA calculator with history, variables, statistics and charts in one notebook.CalculatorsEveryday calculators for money, dates, health and units.Scientific calculatorTrig, logs, powers, roots and factorials, with keyboard support and history.CSV to chartPaste a CSV and export a crisp bar, line, pie or scatter chart.
School and statistics
Statistics calculatorMean, median, mode, quartiles and standard deviation for any list of numbers.Final grade calculatorFind the score you need on your final exam to reach the grade you want.Fraction calculatorAdd, subtract, multiply and divide fractions and mixed numbers, with every step shown.Decimal to fractionTurn any decimal or percent into a fraction in simplest form, including repeating decimals like 0.333...Weighted grade calculatorWork out your overall grade from weighted categories, and what you need on the work still to come.Z-score calculatorZ-scores, p-values for z and t tests, and confidence intervals, with the working shown.P-value calculatorGet the p-value for a z-score or a t statistic with its degrees of freedom, one or two tailed, and see whether it is significant.Confidence interval calculatorWork out a 90, 95 or 99 percent confidence interval for a mean or a proportion from your sample, with the margin of error shown.GradebookA private gradebook with weighted categories, totals, letter grades and CSV import and export.
Number converters
Number converterBinary, octal, decimal and hex, Roman numerals, and numbers written in words.Roman numeral converterConvert numbers to Roman numerals and Roman numerals to numbers, from 1 to 3999.Number to wordsWrite any number out in English words, with or without “and”, or as a check amount with cents.
Money
Mortgage calculatorEstimate your monthly mortgage payment from price, down payment, rate and term, with total interest, an amortization table and extra payments.Loan calculatorWork out the monthly payment and total interest on any fixed-rate loan, with the full schedule and what extra payments save.Compound interest calculatorSee how savings grow with compound interest and regular deposits, with a year-by-year table, or find the deposit that reaches your goal.Discount calculatorFind the sale price after a discount, stack a second discount and add sales tax to see the final price and what you save.Tip calculatorWork out the tip and split the bill between any number of people, with the option to round up each share or the total.Budget plannerA monthly budget with 50/30/20 and zero-based views, charts and CSV export, kept on your device.Invoice makerMake an invoice with your logo, tax, a payment QR code and numbering, track what is unpaid, and download a clean PDF.Quote makerMake a quote or estimate as a clean PDF, then turn it into an invoice in one click.TimesheetTrack time with a timer or by hand, round it and add the hours to an invoice.Expense ledgerAdd receipts, sort them by category and month, and export a CSV or an expense report PDF.Income trackerPayments owed and paid by client and month, with your invoices brought in and tax set aside.Freelance income trackerTrack freelance payments by client and month: what is owed, what is overdue and what came in this year, with tax set aside and your invoices brought in.Salary calculatorSalary to hourly and back, a simple take-home pay estimate, sales tax and percentage change.Salary to hourly calculatorConvert a yearly salary to an hourly rate, or an hourly wage to a yearly salary, using your own hours per week and weeks worked.Take-home pay calculatorEstimate take-home pay from your gross pay and the tax and deduction rates you enter.Sales tax calculatorAdd sales tax to a price or work out the price before tax from a total.
Dates and time
Age calculatorFind an exact age in years, months and days, the weekday you were born and the days until your next birthday.Date difference calculatorCount the days, weeks, months and business days between two dates, or add and subtract days from a date.Time calculatorAdd and subtract hours and minutes, find the time between two times even past midnight, and add a duration to a clock time.Time zone converterSee one time in every city you add, daylight saving included, with a meeting planner.Meeting plannerLine up working hours in several cities and see where they overlap.
Everyday sums
Percentage calculatorWork out X% of a number, what percent one number is of another, percentage change and reverse percentages, with the formula shown.Unit converterConvert length, mass, volume, temperature, area, speed, data, energy, pressure and fuel economy with exact factors.BMI calculatorCalculate BMI in kg and cm or pounds, feet and inches, with the WHO adult category and healthy weight range for your height.GPA calculatorCalculate your GPA on the 4.0 scale from grades and credits, with Honors and AP weighting and your cumulative GPA.Random generatorFair random numbers, dice rolls, coin flips and list picks from your browser's secure source.Dice rollerRoll any number of dice with a total and modifier.Coin flipFlip one coin or a thousand and keep a running tally of heads and tails.Percentage change calculatorFind the percentage increase or decrease from an old value to a new one, and the percentage difference between two numbers.
Health
Calorie calculatorEstimate daily calories with BMR and TDEE, and body fat with the US Navy method.TDEE calculatorEstimate your total daily energy expenditure from age, height, weight and activity with the Mifflin-St Jeor equation.Body fat calculatorEstimate body fat percentage from height, neck, waist and hip measurements with the US Navy formula, in centimetres or inches.
Charts
Bar graph makerCreate a bar graph from CSV or cells copied from Excel or Google Sheets.Line graph makerPaste dates and values to make a line graph online.Pie chart makerMake a pie or donut chart from pasted data or a CSV file.Scatter plot makerMake a scatter plot from two numeric columns.Graphing calculatorPlot y = f(x), pan and zoom, trace values, and find roots and intersections.
Algebra
Equation solverSolve linear, quadratic, cubic and polynomial equations and linear systems, with every step shown.Matrix calculatorDeterminant, inverse, RREF, rank, LU and eigenvalues up to 8x8, in exact fractions with steps.Calculus calculatorIntegrals, derivatives and limits with every step shown, plus a graph.Integral calculatorIntegrate any function with every step shown: substitution, integration by parts, partial fractions and trig identities.Derivative calculatorDifferentiate any function and see each rule applied: power, product, quotient and chain rules, exponentials, logs and trig.Limit calculatorFind limits with the working shown: direct substitution, factoring, conjugates, L'Hopital's rule and limits at infinity.
Geometry
Geometry calculatorSlope, distance and midpoint, the Pythagorean theorem, and the area and volume of common shapes.Slope calculatorEnter two points to get the slope, the line equation, the distance between them, the midpoint and the angle, with every step shown.Pythagorean theorem calculatorFind the hypotenuse or a missing leg of a right triangle with a squared plus b squared equals c squared, plus its angles and area.Area calculatorWork out the area of rectangles, triangles, circles, trapezoids, parallelograms and ellipses in any unit, with the formula shown.Volume calculatorWork out the volume and surface area of cubes, boxes, cylinders, spheres, cones and pyramids, with the formula shown and litres too.
Snowkit QR
QR codes that never expire, retail barcodes and a scanner.
All-in-one
Create
Wi-Fi QR codeMake a QR code that connects phones to your Wi-Fi in one scan, for WPA, WPA2, WPA3 and hidden networks.vCard QR codeMake a QR code that saves your name, phone, email, company and address to a phone's contacts.QR code with logoPut your logo in the middle of a QR code and match your brand colours.Bulk QR code generatorTurn a CSV, Excel sheet or list into QR codes, as a ZIP of PNG or SVG files or a label sheet.WhatsApp and crypto QR codesQR codes that open a WhatsApp chat or a crypto payment, read back and checked before you save them.WhatsApp QR codeMake a QR code that opens a WhatsApp chat with your number and an optional first message.Crypto QR codeMake a QR code for a Bitcoin, Ethereum, Solana or other wallet address, with an optional amount.SMS QR codeMake a QR code that opens a text message to your number with the words already filled in.Email QR codeMake a QR code that opens a new email with the address, subject and message filled in.Phone number QR codeMake a QR code that dials your phone number when scanned, for flyers, signs and business cards.Location QR codeMake a QR code for a place by its latitude and longitude, so phones open the spot in their map app.Calendar event QR codeMake a QR code that adds an event with its title, time and place to a phone's calendar.
Barcodes
Snowkit Launch
Get a site or app ready to go live: crawler rules, domains and SSL.
All-in-one
AI crawlers
llms.txt generatorCreate an llms.txt file for your website with a live preview.robots.txt AI crawlersBuild robots.txt rules for GPTBot, ClaudeBot, Google-Extended, PerplexityBot and 20 more AI crawlers.Block GPTBotStop GPTBot from collecting your pages for model training with a two-line robots.txt rule.Block AI crawlersOne robots.txt block that stops GPTBot, ClaudeBot, CCBot, Bytespider, Google-Extended and the other major AI crawlers.robots.txt checkerPaste a robots.txt and see, for any page, whether GPTBot, PerplexityBot, Google-Extended and other crawlers are allowed, and which rule decides.
Domains and SSL
SSL certificate expiry checkerSee when your sites' SSL certificates expire, who issued them and which names they cover, from public certificate logs.WHOIS lookupLook up a domain's registrar, creation and expiry dates, status and nameservers with RDAP, the official successor to WHOIS.Domain expiry reminderCheck when your domains expire and download one calendar file with reminders 30, 14, 7 and 1 days before.SSL expiry reminderFind when your SSL certificates expire and add reminders to Google, Apple or Outlook calendars with one file.DNS lookupA, AAAA, MX, TXT, CNAME, NS, SOA, CAA and SRV records, plus SPF, DMARC and DKIM checks.SPF DMARC checkerCheck a domain's SPF record and its 10-lookup limit, its DMARC policy and DKIM keys, with plain fixes for every problem.
Icons and branding
Favicon generatorMake favicon.ico, Apple touch, Android and maskable icons plus a web manifest from a logo or letter.Head tag packOne image to favicons, a share image, a web manifest and ready-to-paste head tags in a zip.OG image generatorMake a 1200x630 Open Graph share image from a photo or logo with your title on it, plus the og:image tags.Branded documentsMake a letterhead, report cover or one-pager from your logo and colours, as PDF or Word.Business card makerPrint ten business cards on one sheet, front and back, with a QR code to your website.Email signatureMake an email signature from your details and copy it into your mail app.
Search and sharing
Meta tag generatorWrite SEO, Open Graph and X card tags with live Google, share card and chat previews, or check yours.Meta tag checkerPaste your page source and see which SEO, Open Graph and X card tags are missing, too long or using relative addresses.Sitemap generatorTurn a list of URLs into a valid sitemap.xml with duplicates removed, plus the robots.txt line.robots.txt generatorWrite a robots.txt with your own Disallow rules and sitemap line, and choose which AI crawlers may read your site.Link in bio pageA one-page link list in your colours, as a single HTML file with a QR code.
Legal pages
Security and launch checks
Pre-launch scanFind leaked keys, public .env and .git files, weak headers and missing tags before you launch.HTTP header checkerSee a URL's headers and redirects, with a security header grade and the exact lines to fix.Redirect checkerFollow every redirect from a URL, with each status code, and see the final page's headers.
Everyday tools
Timers and small helpers for getting things done.
Yours
Your SnowkitEverything you make, kept in one private Library on your device, with projects, tricks and your kit.TricksTricks: steps Snowkit repeats for you. Teach Snowkit a trick once, run it on a whole folder, and share it with a link.ChecklistsTick-off checklists for tax season, rental and loan applications, job applications and assignments.Tax document checklistA tick-off checklist of income records, receipts and personal details to gather before you file, with notes and a printable copy.Rental application checklistEverything a landlord usually asks for in a rental application, with links to scan, redact and combine your documents into one PDF.
Decide
Time
Stopwatch and timerA stopwatch with laps and CSV export, plus named countdown timers with a sound at the end.Countdown timerSet one or several named countdown timers with presets or your own time, and hear a sound when each one ends.Online alarm clockBrowser alarms with labels, repeat days, a choice of sounds and snooze, saved on your device.Assignment plannerAssignments and exams with due dates and progress, and every deadline in your calendar.Class schedule makerA weekly class timetable with rooms and colours, saved as an image or added to your calendar.Weekly schedule makerPlan a weekly schedule of classes, work shifts and study blocks, Monday to Sunday, in colours you choose.Classroom timerA big full-screen countdown the whole room can read, with presets and keyboard controls.
Test your devices
Device testsCheck your microphone, webcam, keyboard and screen in seconds, with nothing recorded or sent.Mic testCheck that your microphone works with a live level meter, choose between microphones and play back a short test clip.Webcam testSee your webcam's live picture, resolution and frame rate, switch between cameras and take a test snapshot.Keyboard testPress each key to see it light up on a full keyboard, with key codes and a log, to find dead, stuck or double-typing keys.Dead pixel testFill your screen with solid colours to spot dead, stuck or bright pixels and backlight bleed, and see your screen size and refresh rate.
Music
Guitar tuner and metronomeTune a guitar, bass or ukulele with your microphone, and keep time with a clear metronome.Ukulele tunerTune a soprano, concert or tenor ukulele to standard G C E A with your microphone, or play reference notes and tune by ear.Online metronomeA clear online metronome with accents, time signatures and tap tempo, timed by your browser's audio clock so it stays steady.
~/new in the bin
Fresh off the workbench.
Grammar checkerCheck English grammar, spelling and style privately, on your device.Scientific calculatorTrig, logs, powers, roots and factorials, with keyboard support and history.Document scannerTurn photos of pages into a straight, clean PDF, with edges found for you.FlashcardsFlashcards with spaced repetition and easy import from Quizlet or any list.Screen recorderRecord your screen, a window or a tab with sound. No download, no watermark.Speech to textTranscribe lectures, meetings and videos into text and subtitles, privately.Statistics calculatorMean, median, mode, quartiles and standard deviation for any list of numbers.Citation generatorAPA, MLA, Chicago and Harvard citations and reference lists, with no ads.
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