Step-by-step instructions
- 1
Open FormatDrop's audio converter
Navigate to formatdrop.com/audio-converter. The converter uses FFmpeg compiled to WebAssembly — it runs locally in your browser, your FLAC files never leave your device. No account, no file size limits.
Go to converter - 2
Upload your FLAC file
Drop your FLAC file onto the converter, or click to browse. FLAC files can be large (100+ MB for a single album track at high resolution) — since processing is local, upload time is not a factor.
- 3
Select MP3 as output and choose bitrate
Choose MP3 from the format selector. For bitrate: 320 kbps is transparent for all music at normal listening volumes — essentially indistinguishable from the FLAC source in double-blind tests. 192 kbps is excellent for most content and produces a file 40% smaller than 320 kbps. 128 kbps is acceptable for casual listening on phone speakers or earbuds. For music libraries you'll listen to seriously: 320 kbps.
- 4
Preserve metadata during conversion
FLAC files typically contain rich metadata: album art, track title, artist, album, year, genre, disc number, and more. Good converters transfer this metadata to the output MP3's ID3 tags automatically. FormatDrop preserves FLAC metadata in the MP3 output — your music library organisation stays intact.
- 5
Download and verify
Download the MP3. Import into your music player and verify the track plays correctly, metadata appears (title, artist, album, art), and duration is correct. For critical listening comparison: play the same section in both the FLAC and MP3 — at 320 kbps, the difference should be inaudible.
Why convert FLAC to MP3?
FLAC to MP3 is a 'lossy conversion' — you're permanently discarding audio data that FLAC preserved. However, this is only meaningful in theory. At 320 kbps, MP3 is statistically indistinguishable from lossless in most ABX double-blind tests. The perceptual audio coding in MP3 specifically models what the human auditory system can and cannot perceive — the discarded data is, by design, inaudible. The exception is extremely compressed music with synthesized transients (certain electronic music, some classical percussion) where very trained ears can detect 320 kbps MP3 artifacts under careful listening conditions. For 99% of music in 99% of listening scenarios: 320 kbps MP3 is 'good enough' to be your only copy. That said: always keep the FLAC masters. Storage is cheap; once you delete the FLAC and only have MP3, you've permanently lost the option to create higher-quality versions later.
Your files never leave your device
FormatDrop runs the conversion engine entirely inside your browser using WebAssembly. No file upload. No server. Nothing stored. You can verify this by opening DevTools → Network tab and watching: zero upload requests.
Frequently asked questions
What bitrate should I use when converting FLAC to MP3?
Should I keep my FLAC files after converting to MP3?
Does FLAC to MP3 conversion preserve album art?
No account. No upload. Works in any browser.