Free · No signup · Runs in browser

Free MP3 to FLAC Converter

Convert MP3 to FLAC lossless format — perfect for archiving and audiophile listening.

Why use MorphFlux?

MP3 to FLAC conversion runs entirely in your browser — lossless output for archiving and high-fidelity listening.

Lossless FLAC output

The output FLAC file contains lossless audio — no further quality loss beyond what was already present in the MP3.

Runs locally in your browser

Your MP3 files are processed entirely on your device using FFmpeg WebAssembly. Nothing is uploaded to any server.

Perfect for archiving

FLAC is the standard lossless format for music archiving, supported by all major music players and streaming services.

Free with no signup required

Convert as many MP3 files to FLAC as you need, completely free. No account, no email, no credit card required.

When would you need this?

Common scenarios where converting MP3 to FLAC improves audio archiving and listening quality.

Converting MP3 music files to FLAC for archiving a high-quality music collection

Transforming MP3 recordings to FLAC for playback on audiophile DACs and amplifiers

Converting MP3 audio to FLAC for use with music players that support lossless formats

About MP3 and FLAC

Understanding the difference between MP3 lossy compression and FLAC lossless compression.

MP3

What is MP3?

MP3 uses lossy compression that permanently removes audio data to reduce file size. While sufficient for casual listening, MP3 is not ideal for archiving or high-fidelity audio systems.

FLAC

What is FLAC?

FLAC (Free Lossless Audio Codec) is a lossless audio format that compresses audio without any quality loss. FLAC files are significantly larger than MP3 but preserve every detail of the original audio, making them ideal for archiving and audiophile listening.

Frequently Asked Questions

Everything you need to know about converting MP3 to FLAC online.

How do I convert MP3 to FLAC?

Drop your MP3 file into the converter above or click to select it. The conversion happens in your browser and you can download the FLAC file when ready.

Will the FLAC be higher quality than the MP3?

The FLAC will not recover quality lost during MP3 compression, but it will not lose any further quality. Think of it as a lossless snapshot of your MP3.

Why is the FLAC file so much larger?

FLAC stores lossless audio data, which is typically 3-5x larger than the equivalent MP3. This is the tradeoff for zero additional quality loss.

Is my file uploaded to a server?

No. All conversion happens locally in your browser using FFmpeg WebAssembly. Your files never leave your device.

Is there a file size limit?

Files up to 200MB are supported. Since conversion happens in your browser, very large files may require more memory.

Related Tools

More free converters you might find useful.