MP3 to FLAC Converter

Method

How It Works

1. Drop one or many MP3 files into the area above
2. Each file is decoded locally, then re-encoded to FLAC (lossless FLAC)
3. A download button appears per file; nothing is ever uploaded

MP3 vs FLAC: What Actually Changes

MP3 is the universal lossy format: small files, playable literally everywhere, at the cost of discarding audio detail during compression. At 320 kbps that loss is inaudible to most listeners on most systems, which is why it remains the standard for sharing and USB sticks. FLAC is lossless compression: identical audio to WAV at roughly half the file size. Bandcamp, Beatport, and most quality-focused stores offer it, but CDJ support arrived late and many players still refuse it. Converting between them changes the container and encoding, never the music itself: same length, same sample rate, same channels. What changes is file size, compatibility, and (when a lossy encoder is involved) how much audio detail survives.

About the Quality

Straight answer: converting a lossy file to a lossless container does not restore quality that the original compression removed, but it also loses nothing further and produces a file every DAW, sampler, and CDJ accepts. The encoder is the reference libFLAC engine running as WebAssembly in your browser, producing standard FLAC files at the original sample rate and bit depth.

Why In-Browser Beats Uploading (and Installing)

Upload-based converter sites spend most of their time moving your file over the network, then make you wait in a queue behind other users, and your audio sits on someone else's server. Desktop tools like Audacity or ffmpeg avoid that but demand installation and, in ffmpeg's case, a command line. This converter takes the third path: the same class of codec runs as WebAssembly inside the page, so a MP3you drop is being encoded milliseconds later, nothing installs, nothing uploads, and batch conversion of a whole folder works from any machine, including one you don't own.

Made for DJ and Producer Workflows

This converter is part of a set of browser-based audio tools for DJs: analyze a track's key and BPM, change its key or tempo, and if you manage a whole library across formats, the Vibes app keeps it organized with keys, BPM, and energy written where rekordbox, Serato, and Traktor read them.

Frequently Asked Questions