# Convert MP3 to FLAC

> Convert MP3 to FLAC online for free. Runs entirely in your browser, so your files never leave your device. Fast batch conversion, no sign-up, no watermarks.

URL: https://www.converterrr.com/mp3-to-flac

- Runs in the browser with WebCodecs: files are not uploaded, and no credits are used.
- Engines: WebCodecs (browser), FFmpeg (WASM) (browser), FFmpeg (cloud).
- API: available. `POST /api/v1/jobs` with `"output_format": "flac"` (paid plans).
- More: [Audio converter](https://www.converterrr.com/audio-converter), [MP3 converter](https://www.converterrr.com/mp3-converter), [Compress MP3](https://www.converterrr.com/compress-mp3).

## How to convert MP3 to FLAC

1. **Add your MP3 files.** Drag and drop MP3 files onto the converter, paste them, or click to browse. You can add several at once.
2. **Choose FLAC.** FLAC is already selected. Open Options if you want to change quality, size or metadata.
3. **Convert.** Click Convert. Your files are converted right in your browser in seconds.
4. **Download your FLAC.** Download each FLAC file, or everything at once as a ZIP.

## Good to know

- Converting to FLAC won't restore detail that MP3 compression already removed, but it prevents any further quality loss when you edit and re-save.
- MP3 files are typically used for music libraries, podcasts and audio for any device, while FLAC is best for archiving CDs and high-fidelity music libraries.
- This conversion runs on WebCodecs, running locally in your browser — nothing is uploaded and it works even on slow connections.

## MP3 vs FLAC

|  | MP3 | FLAC |
| --- | --- | --- |
| Full name | MPEG Audio Layer III | Free Lossless Audio Codec |
| Type | Audio | Audio |
| Extensions | .mp3 | .flac |
| MIME type | audio/mpeg | audio/flac |
| Best for | music libraries, podcasts and audio for any device | archiving CDs and high-fidelity music libraries |
| Properties | lossy compression | lossless, open standard |

**MP3:** MP3 is the most compatible audio format in the world. Its lossy compression keeps music small enough to share while sounding close to CD quality.

**FLAC:** FLAC compresses audio without losing any quality, typically halving the size of a WAV file.

The other way around: [convert FLAC to MP3](https://www.converterrr.com/flac-to-mp3).

## Related conversions

- [FLAC to MP3](https://www.converterrr.com/flac-to-mp3) (in the browser)
- [MP3 to WAV](https://www.converterrr.com/mp3-to-wav) (in the browser)
- [MP3 to M4A](https://www.converterrr.com/mp3-to-m4a) (in the browser)
- [MP4 to FLAC](https://www.converterrr.com/mp4-to-flac) (in the browser)
- [WAV to FLAC](https://www.converterrr.com/wav-to-flac) (in the browser)
- [MP3 to AAC](https://www.converterrr.com/mp3-to-aac) (in the browser)
- [MOV to FLAC](https://www.converterrr.com/mov-to-flac) (in the browser)
- [MP3 to OGG](https://www.converterrr.com/mp3-to-ogg) (in the browser)
- [M4A to FLAC](https://www.converterrr.com/m4a-to-flac) (in the browser)
- [MP3 to Opus](https://www.converterrr.com/mp3-to-opus) (in the browser)
- [WebM to FLAC](https://www.converterrr.com/webm-to-flac) (in the browser)
- [MP3 to WMA](https://www.converterrr.com/mp3-to-wma) (in the browser)

## Convert MP3 to other formats

[MP3 to WAV](https://www.converterrr.com/mp3-to-wav), [MP3 to M4A](https://www.converterrr.com/mp3-to-m4a), [MP3 to AAC](https://www.converterrr.com/mp3-to-aac), [MP3 to OGG](https://www.converterrr.com/mp3-to-ogg), [MP3 to Opus](https://www.converterrr.com/mp3-to-opus), [MP3 to WMA](https://www.converterrr.com/mp3-to-wma), [MP3 to AIFF](https://www.converterrr.com/mp3-to-aiff), [MP3 to AMR](https://www.converterrr.com/mp3-to-amr), [MP3 to M4B](https://www.converterrr.com/mp3-to-m4b), [MP3 to AC3](https://www.converterrr.com/mp3-to-ac3), [MP3 to MP2](https://www.converterrr.com/mp3-to-mp2), [MP3 to WEBA](https://www.converterrr.com/mp3-to-weba), [MP3 to OGA](https://www.converterrr.com/mp3-to-oga), [MP3 to MKA](https://www.converterrr.com/mp3-to-mka), [MP3 to WV](https://www.converterrr.com/mp3-to-wv), [MP3 to AU](https://www.converterrr.com/mp3-to-au), [MP3 to TTA](https://www.converterrr.com/mp3-to-tta)

## Convert other formats to FLAC

[MP4 to FLAC](https://www.converterrr.com/mp4-to-flac), [WAV to FLAC](https://www.converterrr.com/wav-to-flac), [MOV to FLAC](https://www.converterrr.com/mov-to-flac), [M4A to FLAC](https://www.converterrr.com/m4a-to-flac), [WebM to FLAC](https://www.converterrr.com/webm-to-flac), [MKV to FLAC](https://www.converterrr.com/mkv-to-flac), [AAC to FLAC](https://www.converterrr.com/aac-to-flac), [AVI to FLAC](https://www.converterrr.com/avi-to-flac), [OGG to FLAC](https://www.converterrr.com/ogg-to-flac), [WMV to FLAC](https://www.converterrr.com/wmv-to-flac), [Opus to FLAC](https://www.converterrr.com/opus-to-flac), [WMA to FLAC](https://www.converterrr.com/wma-to-flac), [M4V to FLAC](https://www.converterrr.com/m4v-to-flac), [3GP to FLAC](https://www.converterrr.com/3gp-to-flac), [FLV to FLAC](https://www.converterrr.com/flv-to-flac), [MPEG to FLAC](https://www.converterrr.com/mpeg-to-flac), [AIFF to FLAC](https://www.converterrr.com/aiff-to-flac), [AMR to FLAC](https://www.converterrr.com/amr-to-flac), [TS to FLAC](https://www.converterrr.com/ts-to-flac), [MPG to FLAC](https://www.converterrr.com/mpg-to-flac), [M4B to FLAC](https://www.converterrr.com/m4b-to-flac), [MTS to FLAC](https://www.converterrr.com/mts-to-flac), [VOB to FLAC](https://www.converterrr.com/vob-to-flac), [M2TS to FLAC](https://www.converterrr.com/m2ts-to-flac)

## MP3 to FLAC: frequently asked questions

### How do I convert MP3 to FLAC?

Drop your MP3 file onto the converter above, make sure FLAC is selected, and click Convert. When it's done, download the FLAC file — it usually takes a few seconds.

### Is it safe to convert MP3 to FLAC here?

Yes. MP3 to FLAC conversion happens entirely inside your browser using WebAssembly, so your file is never uploaded to any server.

### Is the MP3 to FLAC converter free?

Yes — free with no watermark. Signed-out visitors can convert 25 files a day, and a free account raises that to 250.

### Will converting MP3 to FLAC reduce quality?

No — FLAC preserves the content of your MP3 file as faithfully as the format allows.

### Can I convert multiple MP3 files at once?

Yes. Add up to 5 files at a time without an account, 10 with a free account and up to 500 on paid plans, then download them individually or as a single ZIP.

### Can I convert FLAC back to MP3?

Yes — use our FLAC to MP3 converter. Note that converting back and forth between formats can't recover detail lost to lossy compression.