Audio converter
Convert your audio to MP3, M4A, WAV, OGG or FLAC, in batches, right in your browser. Nothing is uploaded.
Files are processed in your browser and never uploaded.
How to use Audio converter
Add your files
Drop up to 500 audio files onto the upload area, or tap the area to choose them from your device.
Set the options
Choose Engine. Every setting is on screen before you add a file, so you can see what the tool will do before it runs.
Run it and save
Press Convert them, Don →. The button stays disabled until there is something to work on, and each file shows its own progress and result. Press Download all (zip), Don. Each finished file keeps a name based on the one you started with, so you can tell the versions apart.
What this tool does
Convert up to 500 audio files at once
Add up to 500 files, each up to 1 GB, and the batch is converted one file after another on your device, each with its own progress line.
Output MP3, M4A, WAV, OGG or FLAC
Convert to sets the output: MP3 and M4A when size matters, WAV and FLAC when you want the audio kept intact.
Choose bitrate and mono or stereo
Bitrate runs 128k, 192k, 256k or 320k, and you can keep the original channels or force mono, which roughly halves the size of a speech recording.
Lossless WAV and FLAC options
WAV and FLAC keep every sample, so a master you plan to edit again loses nothing. FLAC is about half the size of the same audio as WAV.
Download each file or all as a zip
Save any finished file on its own, or take the whole batch as one zip when you have converted a folder's worth.
No upload, no sign-up
Nothing is uploaded. The audio is decoded and re-encoded by your browser, so even a 1 GB file never leaves the machine.
Frequently asked questions
How many files can I convert, and will my device cope?
You can add up to 500 audio files at once. Everything runs on your device and each finished file is held in memory, so a very large batch can slow down or crash the tab. On a phone or older machine, convert a smaller batch at a time.
Are my files uploaded anywhere?
No. The audio is converted inside your browser on your device, and nothing is ever sent to a server.
Which format should I pick?
MP3 plays almost everywhere and is the safe default. M4A (AAC) is a little smaller at the same quality. OGG (Opus) is very efficient at small sizes. WAV and FLAC are lossless and keep full quality; WAV is uncompressed and large, while FLAC is compressed and smaller than WAV.
Does the bitrate matter?
For MP3, M4A and OGG a higher bitrate means better quality and a bigger file; 192 kbps is a good balance for music and 128 kbps is fine for speech. WAV and FLAC ignore the bitrate because they do not throw away any audio.
Will converting to MP3 from a lossless file lose quality?
Converting from a lossless source like WAV or FLAC to a lossy one such as MP3 does lose a little quality, but at 192 kbps and above most people will not hear the difference. Converting between two lossless formats keeps full quality.
What are the two engines?
Fast mode converts on your device with no download; MP3, WAV and FLAC work in every modern browser, and M4A and OGG use your browser's built-in encoder. Compatible mode uses a built-in engine that handles more files but downloads about 31 MB the first time and is slower. It picks automatically and you can override it.
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