Audio tool
Convert FLAC to MP3
FLAC is lossless, which is why it sounds perfect and takes up so much room. MP3 gets it to about a third of the size and onto every device you own. Keep the FLAC — this is a one-way trip.
- 100% free
- No signup
- Batch convert
Drop your FLAC files here
or click to browse from your device
Supports FLAC · 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
- FLAC
- 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
FLAC decodes to exactly the original samples — that is what lossless means — so the MP3 is produced from pristine input with a single generation of loss, which is the best case MP3 can offer. LAME handles the encode at your chosen bitrate with sample rate, channel layout and duration preserved. Worth knowing about the ceiling: MP3 tops out at 320 kbps and cannot represent sample rates above 48 kHz, so a 96 kHz studio FLAC is resampled down. That resampling is competently done and inaudible in normal listening, but it means the MP3 genuinely cannot be a substitute for a high-resolution master. Convert for portability, archive the FLAC.
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
Getting a lossless library onto a phone
A third of the size, and phones play MP3 without any app.
Car stereos and older hardware
FLAC support is still patchy on anything more than a few years old.
Sharing a track with someone
MP3 avoids both the size and the "what is this file" problem.
Freeing space while keeping the originals
Batch-convert, move the FLACs to an external drive.
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
- The MP3 sounds different on good headphones
- Use 320 kbps. On revealing equipment, 192 kbps from a lossless source is where some people start to hear the difference.
- My FLAC is over 200 MB
- That is around 25 minutes of CD-quality stereo, or less for high-resolution files. Split the album into tracks first.
- The tags did not come across fully
- Basic tags carry over; less common FLAC fields have no MP3 equivalent. Re-tag with a dedicated tool if the metadata matters.
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 toolsAm I destroying my lossless files?
The MP3 is a lossy copy, and no setting recovers what it discards. But the FLAC you uploaded is untouched — we never modify your input. Keep it as the archive and treat the MP3 as the copy you carry around.
What bitrate keeps it sounding lossless?
Nothing does, strictly speaking. In practice 320 kbps is transparent to almost everyone on almost all material; 256 kbps is transparent to most people on most material. If you have the storage and this is music you care about, use 320.
How much smaller will it be?
Roughly a third at 320 kbps, and about a fifth at 192 kbps. FLAC itself is already about half the size of the equivalent WAV, so the jump is smaller than people expect.
Is my file uploaded?
Yes — FLAC decoding and MP3 encoding both need FFmpeg. Stored under a random name, never listened to, deleted within 24 hours.
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.