MP3 to FLAC Converter
Convert MP3 to FLAC for lossless archival audio. Free, private, up to 100 MB per file.
- No signup
- Private
- Fast
Super Fast
Convert in seconds on desktop and mobile.
100% Private
Files never leave your device.
Secure
Browser-side processing only.
Lossless FLAC
No quality loss from re-encoding source if already lossless.
Why use this tool?
FLAC preserves full audio quality while still compressing file size compared to WAV — ideal for audiophile libraries.
How to convert MP3 to FLAC
Step 1: Upload your MP3 file
Choose an MP3 audio file from your device or drag it into the upload area. Files up to 100 MB are supported.
Step 2: Convert in your browser
We convert the audio to FLAC locally using FFmpeg in your browser — nothing is uploaded to our servers.
Step 3: Download your FLAC
Preview the result and download the converted file with one click.
Supported formats
- Input: MP3 (.mp3) up to 100 MB
- Output: FLAC
Frequently asked questions
Is this MP3 to FLAC converter free?
Yes. Convert MP3 to FLAC online for free — no account, no watermark, and no limits on how many files you convert.
Are my files uploaded to your servers?
No. Conversion runs entirely in your browser with FFmpeg WebAssembly. Your files never leave your device.
What is the maximum file size?
You can convert MP3 files up to 100 MB per file. Very large files may be slow or fail on low-memory devices.
Why does the first conversion take longer?
The first run downloads the FFmpeg engine into your browser (one time per session). Later conversions on the same page are faster.