Free online MP3 Audio to FLAC Audio converter. Files are processed locally in your browser — no uploads, 100% private.
Drop your .MP3 file here
or click to browse from your device
100% browser-based — no server uploads, no cloud processing
Free forever — no account or subscription required
Supports batch conversion for multiple files at once
Works on any device — desktop, tablet, and mobile
Results available in seconds — no server queue or wait time
Files are cleared immediately after processing for maximum privacy
MPEG Layer 3 — the universal compressed audio format
Free Lossless Audio Codec — perfect reconstruction
FLAC is an industry-standard format with universal support
FLAC preserves every detail without any compression loss
Source: MPEG Layer 3 — the universal compressed audio format
Output: Free Lossless Audio Codec — perfect reconstruction
Lossy — original audio data is permanently discarded
Audible artifacts at very low bitrates
Not suitable for professional audio mastering
Music distribution and streaming services
Podcast episodes and voice recordings
Video background music and soundtrack delivery
Ringtones and mobile notification sounds
Use 192–320 kbps for music; 64–128 kbps is sufficient for voice content
VBR (variable bitrate) encoding gives better quality per byte than CBR
Never convert from one lossy format to another — use a lossless source
Joint stereo mode is more efficient than true stereo at the same bitrate
Drag & drop your file or click to browse
Files are processed instantly in your browser
Save your converted or processed file
Upload your MP3 file using the drop zone above. Your file is instantly converted to FLAC format right in your browser — no server upload, no waiting.
Completely. Our converter processes your MP3 file 100% in your browser using client-side code. It never leaves your device or touches any external server.
It depends on the formats. Converting from lossless to lossy (e.g. PNG to JPEG) may reduce quality. Converting lossless-to-lossless (e.g. PNG to WebP lossless) preserves all quality.
Free, instant, and 100% private. Your files are processed locally in your browser.