Audio tool
Convert audio to MP3
Drop in a WAV, FLAC, OGG or M4A file and get an MP3 you can play anywhere. Pick the bitrate if you care about the size-versus-quality trade; the default is the one most people would pick anyway.
- 100% free
- No signup
- Batch convert
Drop your files here
or click to browse from your device
Supports WAV, FLAC, OGG, MP4 · Max 200 MB per file · Up to 100 files
You can also paste a copied image with Ctrl+V / ⌘V
Conversion settings
MP3 is lossy, so this is a size-versus-quality trade. 192 kbps is transparent to most listeners on most material.
- Secure & privateYour files are never shared
- Lightning fastMost images in under a second
- High qualitymozjpeg and libvips under the hood
- Works everywhereAny device, any browser
Input, output and limits
Every figure below is read from the same configuration the server enforces, so this page cannot promise a limit the system will refuse.
- Input formats
- WAV, FLAC, OGG, M4A
- Output format
- MP3What is MP3?
- Maximum file size
- 200 MB per file
- Maximum duration
- 60 minutes
- Batch processing
- Yes — several files at once, downloaded as one ZIP
- Price
- Free, with no account and no watermark
- Processing
- On our own server, then deleted automatically
- Engine
- FFmpeg
- File retention
- Upload and result both deleted after 24 hours
Output quality
The audio is decoded once and re-encoded with LAME, the reference MP3 encoder, at the bitrate you choose — there is no intermediate re-compression and no resampling unless the source rate is one MP3 cannot carry. Sample rate, channel layout and length are preserved exactly, so the result lines up with the original if you are syncing it against video or a transcript. The honest limit is inherent to the format rather than to this tool: MP3 is lossy, so converting from FLAC or WAV throws information away permanently, and converting an existing MP3 through another MP3 stage compounds the loss. If your source is already an MP3 and you only want it smaller, you are better off accepting the file as it is than running it through a second encode.
See what this tool actually did to real files — median size change, speed and sample size, published whichever way the numbers fall.
Common use cases
Making studio recordings portable
WAV files from a recorder are enormous. MP3 at 192 kbps is roughly a tenth of the size and plays anywhere.
Getting FLAC onto a car stereo or old player
Plenty of hardware never learned FLAC. MP3 is the universal fallback.
Voice memos and interviews
M4A from a phone converts to MP3 for transcription services that only accept it.
Shrinking a podcast for upload
128 kbps mono-friendly speech drops the file size dramatically with no audible cost.
Settings you can change
Quality
320 kbps — highest, biggest file · 256 kbps — very good · 192 kbps — the usual choice · 128 kbps — small, fine for speech · 96 kbps — voice notes only
MP3 is lossy, so this is a size-versus-quality trade. 192 kbps is transparent to most listeners on most material.
Troubleshooting
- It says there is no audio track
- The file is probably a video container with the sound stripped, or it is damaged. Try playing it locally first — if your own player is silent, there is nothing here to convert.
- The MP3 is bigger than I expected
- Lower the bitrate. A one-hour recording at 320 kbps is about 140 MB; at 128 kbps it is about 55 MB.
- My .aac or .wma file is rejected
- Those two formats are not accepted yet. If your file came from a phone it is most likely .m4a despite what it is called — try renaming the extension and uploading again.
Something else went wrong? Tell us what happened — a person reads every report, and that is how this list gets longer.
Privacy and file deletion
- Stored under a random nameUploads have no connection to the file name you sent and are never served from a public directory. This tool accepts files up to 200 MB, several at a time.
- Deleted on a timerUploads are removed within 2 hours and finished results within 24 hours, whichever comes first.
- Nobody looks at themNo one browses uploads, nothing is shared with third parties, and no file is used to train anything. The only thing kept past deletion is the size and timing of the job.
- Encrypted in transitEvery request runs over HTTPS, so the file is encrypted between your device and our server.
Full privacy policyHow the system is builtWhat we measure, and why it is kept
Frequently asked questions
Browse video toolsWhich formats can I put in?
WAV, FLAC, OGG and M4A. If you have a video file instead, use MP4 to MP3 — that tool strips the picture and keeps the sound. Raw .aac and .wma are not accepted yet.
Will converting FLAC to MP3 lose quality?
Yes, and it is worth being straight about it. FLAC is lossless; MP3 is not. Going FLAC to MP3 discards audio information permanently, and no bitrate setting undoes that. At 256 or 320 kbps the difference is inaudible to most people on most equipment, but it is a one-way trip — keep the FLAC if it is your only copy.
What bitrate should I choose?
192 kbps for music you will listen to normally, 128 kbps for spoken word where file size matters, and 320 kbps if this is going into an archive or you are unsure. Above 320 there is nothing to gain — that is the MP3 format's own ceiling.
Is my file uploaded?
Yes. Audio encoding needs FFmpeg, which cannot run usefully in a browser tab for files this size. Your file is stored under a random name, is never listened to by a person, and is deleted automatically within 24 hours.
Are the tags and album art kept?
Basic tags — title, artist, album — carry across. Embedded cover art is dropped, because it travels as a one-frame video stream and some players refuse a file that has one.
How long does my video stay on your server?
Your upload and the finished file are both deleted 24 hours after the job starts. This tool accepts files up to 200 mb and 60 minutes long. Nothing is shared with anyone and there is no account for it to be attached to; while a job is live we may open it in our own admin area to check the encode came out clean.