MP3 to FLAC Converter
Convert MP3 to FLAC in your browser. Free, private, and on your device.
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Drop your MP3 files here
One file or a whole batch. Everything stays on your device.
Works with MP3, WAV, M4A, AAC, OGG, OPUS, FLAC, WEBM, MP4, MOV and MKV. Other supported files are welcome too.
Convert MP3 to FLAC — Without Uploading Anything
Need your MP3 as a FLAC? FLAC is useful for storing music in full quality and audiophile listening. Create a working copy in your browser, then open it in the app that needs it. Keep your original MP3 too.
Many converters ask you to send a recording to their server before they can do any work. Crikk reads your local file and runs the audio engine on your device. You skip the upload, and the sound stays with you. You can make another copy with different settings whenever you need one.
How to Convert MP3 to FLAC
- Step 1
Add your MP3 files
Drop your files on the page or use Choose Files. You can add several recordings at once. A MP3 page accepts other supported formats too; each row shows what was actually detected.
- Step 2
Check the output format
FLAC starts selected. Choose another format if your plans change, then open Advanced for bitrate, sample rate or channel settings. Leave the defaults to preserve source settings where possible.
- Step 3
Convert and download
Click Convert. Files finish one at a time so several encoders do not compete for memory. A single result downloads automatically. For a batch, download individual files or save the completed results together as a ZIP.
MP3 vs FLAC: What's the Difference?
| Feature | MP3 | FLAC |
|---|---|---|
| Full name | MPEG-1 Audio Layer III | Free Lossless Audio Codec |
| Type | Lossy | Lossless |
| Sound quality | Good to great, depending on bitrate | Perfect, CD-quality or better |
| File size | Small — about 1–2.5 MB per minute | Medium — about 5–6 MB per minute (half of WAV) |
| Plays on | Plays on almost everything | Most players and phones; Apple Music doesn't import it |
| Best for | sharing music, phones and car stereos, podcasts | storing music in full quality, audiophile listening, backups that take less space than WAV |
Will Converting MP3 to FLAC Affect Quality?
Your FLAC keeps the decoded sound from the MP3, within the output bit depth and sample rate you choose. It cannot restore detail removed when the MP3 was made. A lossless working format avoids another lossy encoding step when an editor saves your work. Raising the sample rate alone does not improve the recording.
Will My File Get Bigger or Smaller?
FLAC is usually about 4 times bigger than MP3. A lossless format stores more of the decoded signal instead of using the same kind of lossy compression. A bigger file does not mean that missing detail has returned.
As a rough guide, a 5 MB MP3 could become about 20 MB as FLAC. Duration, channels, sample rate and bitrate all affect the result, so this is an estimate.
When to Use FLAC
- storing music in full quality. Keep a lossless music collection.
- audiophile listening. Store recordings without another lossy conversion.
- backups that take less space than WAV. Use compressed lossless files instead of large PCM files.
Before choosing FLAC, check what the receiving app or player accepts. Most players and phones; Apple Music doesn't import it. VLC, Foobar2000, Windows Media Player, most Android phones are common ways to open this format. Keep the original recording until you have played the result and confirmed that it fits your project.
Why Use Crikk to Convert MP3 to FLAC
🔒 Private by design
Local file reading and conversion keep your recording on your device. The tool does not upload sound or file names.
⚡ No upload wait
Conversion starts with a local file. Speed depends on its length, the output codec and your device.
📦 Convert a batch
Add several files and work through them one at a time. Download completed files separately or together in a ZIP.
🎚️ Choose your settings
Keep source settings where possible, or choose a bitrate, sample rate and channel count for your next app.
↔ Change your mind
The output dropdown stays editable after you add files. Pick a different format without leaving the current page.
✓ Free and simple
There is no account to create and no watermark added to your sound. Your original files stay available for later.
About MP3 Files
MP3 is the most popular audio format in the world. It shrinks audio to a small size while still sounding good. Almost every phone, computer, car stereo, and app can play it.
Opens with: Any media player — Windows Media Player, Apple Music, VLC, and every phone
Made by Fraunhofer Society / MPEG · Since 1993
About FLAC Files
FLAC keeps perfect sound, just like WAV, but at about half the size. Music fans use it to store full-quality collections. It's free and open.
Opens with: VLC, Foobar2000, Windows Media Player, most Android phones
Made by Xiph.Org Foundation · Since 2001
Frequently Asked Questions
Will converting MP3 to FLAC improve the sound?
No. It cannot bring back missing detail. It creates a file in the format your next app or editing workflow needs.
Why is my FLAC bigger?
FLAC stores audio differently from MP3. Extra space comes from the output representation, rather than newly recovered sound.
Why convert MP3 to FLAC?
Your editor, production app or client may ask for FLAC. A lossless working file also avoids repeatedly encoding your edits into MP3.
Is this MP3 to FLAC converter free?
Yes. It is free to use with no sign-up, watermark or daily conversion limit.
Do you upload my MP3 file?
No. The file is read and processed by your browser on your device. The conversion tool does not send audio or file names to a server.
Does it work without internet?
The tool can cache the current page and its audio engine when service workers are available. Offline availability depends on your browser cache. Open the page online first; browser storage cleanup can remove cached files.
Can I convert several MP3 files?
Yes. Add a batch and convert it one file at a time. Each result has a download button. Multiple finished files can also be saved together in a ZIP.
Is there a file size limit?
There is no server upload limit because your files stay local. Very large files still depend on device memory, and output files are held in your browser. A computer is a better choice for long recordings.
Does it work on phones?
A browser with the required audio features can run the tool. Codec support varies by device. Unavailable output formats are disabled, and an error row explains when the selected file cannot be decoded.
Can I choose something other than FLAC?
Yes. The page starts with FLAC, but the output dropdown stays editable. Changing it updates this session without navigating to another page.
Related Conversions
Convert MP3 to other formats
Convert other files to FLAC
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Convert MP3 to FLAC