Audio converter
Drop one or more audio files, or a video, and choose the format and quality. There is no artificial size limit.
Drop your files hereTap to choose your files
or click to chooseMP3, WAV, OGG, M4A, FLAC, MP4 · up to 20 files
Processed on your device: nothing is uploaded
Your browser is too old for this tool
It can’t read or create audio. Update Chrome, Edge, Firefox, or Safari and try again.
Your browser doesn’t include audio WebCodecs, so its own decoder is used. It works the same with MP3, WAV, M4A, and FLAC; very long audio may take longer, and OGG isn’t available.
You can drag more files into the box above.
Output format
To create M4A (AAC), your browser downloads a ≈ 250 KB encoder once, only if it doesn’t include one. On a mobile connection this can take a few seconds.
More options
Raises or lowers the volume so the loudest point ends up close to the maximum, without distorting.
This file has several audio tracks (for example, different languages).
Trim (optional)
Leave it empty to start from the beginning.
Leave it empty to go to the end.
File details (optional)
Conversion complete
How to use it
- Drop your audio files into the box or select them from your device. Videos work too: their audio is used. You can load up to 20 at once.
- Choose the output format and the quality. Below, you will see how large the result would be before you start.
- If you need to, open “More options” to change the sample rate, switch to mono, normalize the volume, trim the start and end, or add a title and artist.
- Select “Convert audio,” listen to the result, and download it. If you converted several files, they download together in a ZIP.
Frequently asked questions
Are my audio files uploaded to a server?
No. The conversion happens inside your browser, using your own device’s power. The files never leave it, so you can convert private recordings safely.
Which formats can I convert?
You can load MP3, WAV, OGG, Opus, M4A, AAC, FLAC, and WebM files, and also MP4, MOV, MKV, or WebM videos to keep their audio. Older formats such as WMA, AMR, or AC-3 can’t be opened by any browser. The output is MP3, WAV, OGG (Opus), M4A (AAC), or FLAC. M4A and FLAC work in any modern browser: if yours doesn’t include them, a small encoder is downloaded the first time. OGG depends on your browser, and the page tells you if it can’t create it.
What MP3 quality should I choose?
For music, 192 kbps sounds very good and stays small; 320 kbps is the maximum and only shows up on very good equipment. For speech, such as podcasts, lectures, or voice notes, 64 or 96 kbps is enough and the file stays small. MP3, OGG, and M4A files are created at a constant bitrate (CBR): the size is proportional to the length and the kbps you choose, with no surprises.
Is quality lost when converting?
Converting to WAV or FLAC loses nothing compared with the original audio. MP3, OGG, and M4A compress the sound with some loss: at 192 kbps or higher the difference is barely noticeable. Keep in mind that turning an MP3 into a WAV doesn’t bring back the quality that was already lost: the file just gets larger.
Can I convert several files at once?
Yes, up to 20 at a time. Each one is converted with the same settings, you see its progress, and you can download them separately or all together in a ZIP.
Is there a size limit or a watermark?
There is no watermark and no artificial limit. You can load files of up to 4 GB each; the real limit is your device’s memory, so very long WAV files may be slower or fail. In that case, choose MP3 or OGG.
Which format to choose
- MP3: the most compatible. It plays on any player, phone, and car. It is the best choice if you are unsure.
- M4A (AAC): sounds a bit better than MP3 at the same size and is Apple’s format.
- OGG (Opus): very efficient for speech and music, ideal if file size matters.
- WAV: uncompressed and lossless. It is good for editing, but one minute takes about 10 MB.
- FLAC: lossless and smaller than WAV. Ideal for keeping music at studio quality.
More than one file, more control
With a single file you can trim the start and end and type the title, artist, and album. With several, they are all converted with the same settings and delivered in a ZIP. If a video has several audio tracks, for example in different languages, you can choose which one to convert.
About the encoders
MP3 files are created with an encoder based on LAME, compiled to WebAssembly (LGPL license). If your browser can’t create M4A (AAC), the AAC encoder from FFmpeg is used, also in WebAssembly (LGPL license), and FLAC files are created with libFLAC (BSD license). Each one is downloaded only when you choose that format and runs on your device.
Updated on October 1, 2026