YOUR FILES STAY ON YOUR DEVICE

Convert MP3 to FLAC

Convert MP3 to FLAC locally in your browser. No upload required. Choose output settings and download individual files or a batch ZIP.

AUDIO CONVERTER Your files stay on your device.

Input: MP3
Up to 32 MB per file · 10 minutes
View supported formats

Audio settings

Recommended settings

FLAC

Output format

Advanced settings

Sample rateChannelsCompression level

Compression changes file size and encoding time, not quality. Original sample rate and channels preserve PCM samples from supported WAV/FLAC inputs.

Conversion removes tags and artwork. Mono/stereo only. View supported formats

Processing happens locally in your browser. Your files are never uploaded.

Audio codec licenses & notices. Originals untouched. Verify local processing. Advertising makes separate network requests.

Three steps to your FLAC

Choose one or more MP3 files.
Adjust the output settings, then convert.
Download individual files or the batch as a ZIP.

Need a shorter clip? Trim audio with a waveform.

Audio quality

Saving decoded audio as WAV, FLAC or AIFF does not restore detail already lost in the source. It avoids another lossy codec stage.

Format compatibility and settings

MP3 input accepts MPEG Layer III CBR/VBR. Decoding removes tags and artwork and cannot restore detail lost by the original encoder. FLAC compresses PCM losslessly. Compression level changes storage size and encoding time, not fidelity. Check FLAC support in the receiving player or editor.

Local processing and practical limits

The audio engine loads when needed and processes one file at a time in a worker. No upload server is involved. Cancel stops the worker. Download and clear results to release memory. Tags and artwork are omitted.

Verify local processing. Read the audio software notices.

View audio tools →

GOOD TO KNOW

Audio conversion questions.

How do I convert MP3 to FLAC?

Choose files, adjust the output settings and press Convert. Download each result or use Download All for a ZIP. All conversion happens on your device.

Does conversion affect audio quality?

Saving decoded audio as WAV, FLAC or AIFF does not restore detail already lost in the source. It avoids another lossy codec stage.

When should I choose FLAC?

Are files or metadata uploaded?

No. File names, audio bytes, duration, metadata and decoded samples stay on your device. Conversion removes tags and artwork. Engine downloads and separate advertising requests may appear in your Network panel.

Which files and browsers work?

Use a browser with WebAssembly and Web Workers. This version supports mono/stereo PCM WAV (8, 16 or 24-bit), native FLAC (8, 16 or 24-bit), standard PCM AIFF (16 or 24-bit, not AIFC), MPEG Layer III MP3 input (CBR/VBR), single-stream Ogg Vorbis and Ogg Opus. MP3 output supports CBR/VBR at 44.1 or 48 kHz. Inputs are limited to 32 MB, 10 minutes and 64 MB of decoded PCM. Batch results are limited to 64 MB. Encrypted, chained and multichannel recordings are not supported.