Add as many files as you like. They are converted one after another on this device, and nothing is uploaded. Turn audio into MP3, M4A, OGG, WAV or FLAC, or pull the sound out of a video, free and private.
How to convert audio
- Press Choose audio files and select one or more files.
- Pick the format under Convert to: MP3, M4A, OGG, WAV or FLAC.
- For compressed formats, choose the Quality: 128, 192, 256 or 320 kbps.
- Press Convert. Press Stop if you change your mind.
- Download each file, or use Download all as ZIP to take the whole batch.
Remove all clears the list so you can start a new batch.
Which format to choose
MP3 plays on practically every phone, car stereo and computer, so it is the safe choice for sharing. M4A uses AAC, which sounds a little better than MP3 at the same size and suits Apple devices. OGG uses the Opus codec, which is very efficient and popular for the web and games. WAV is uncompressed, so it is large but ideal for editing. FLAC appears when your browser can encode it; it is lossless like WAV but about half the size.
Choosing the quality
The kbps number is how much data each second of sound may use. Higher numbers sound closer to the original and make bigger files. Converting from one lossy format to another cannot add back detail that was already removed, so there is little point in choosing a higher quality than the source. If your browser cannot encode at the rate you picked, the closest lower rate is used and shown next to the file.
As a rough guide, 128 kbps is fine for speech, 192 kbps suits most music, and 256 or 320 kbps is for careful listening.
Supported files
You can add MP3, WAV, M4A, AAC, OGG, Opus and FLAC audio, plus MP4, MOV, MKV and WebM video files.
Sound from videos
Add an MP4, MOV, MKV or WebM video and only its soundtrack is kept, which is handy for saving a talk, a lesson or a song from a clip you recorded. The picture is ignored, so this is quick even for long videos.
Common uses
- Making a small MP3 of a lecture to listen to on the bus.
- Changing a voice memo from M4A to MP3 so it opens on any device.
- Converting music files to WAV for editing in a recording program.
- Preparing audio for a website, a game or a video project.
To clean up or edit a file after converting, try the audio clean-up or the audio editor.
Private by design
Your browser reads each file, converts it with its own built-in audio engine and offers the result straight from memory. There is no server that receives your recordings, so voice memos, interviews and unreleased music stay on this device. Very large batches use more memory, so a phone handles fewer long files at once than a computer.
Questions
Why is my converted file bigger?
Moving to WAV or FLAC, or to a higher kbps than the original, makes files larger without adding quality.
Can I convert protected music?
Only files your browser can open. Music with copy protection will not decode.
Is there a file size limit?
There is no set limit, but the whole file is held in memory while it converts, so very long recordings need a computer rather than a phone.
Why is FLAC missing from the list?
It is offered only when your browser can encode it.