Compress MP3 files while preserving audio quality. Choose quality level and download the optimized file.
Drop an audio file to compress
or click to browse — MP3, WAV, FLAC, AAC, OGG
100% browser-based — no server uploads, no cloud processing
Free forever — no account, credit card, or subscription required
Works on any device — desktop, tablet, and mobile
Supports MP3, WAV, FLAC, AAC, OGG, Opus and more
Results available in seconds — no server queue or wait time
Files cleared immediately after processing — maximum privacy
Music streaming and podcast distribution
Ringtones, alerts, and notification sounds
Video soundtrack and background music delivery
High-quality archiving and master backups
Always start from the highest-quality source: lossless to lossy, never lossy to lossy
For streaming, target -14 LUFS (Spotify) or -16 LUFS (podcasts) for consistent loudness
Sample rate and bit depth matter more than codec choice at equivalent bitrates
Preview converted audio before distribution to catch artifacts early
Drag & drop your file or click to browse
Files are processed instantly in your browser
Save your converted or processed file
Yes, completely free. No usage limits, no watermarks, no account required.
Your files are processed entirely in your browser using client-side code. They never leave your device and are never uploaded to any server.
MP3 Compressor works with all major audio formats: MP3, WAV, FLAC, AAC, OGG, Opus, M4A and more.
Free, instant, and 100% private. Your files are processed locally in your browser.