Compress Audio reduces a file's size by lowering its bitrate and encoding to MP3 or AAC. It's ideal for shrinking large WAV recordings for email or upload. Pick a bitrate, export in your browser, and see how much smaller the file became.
Drop a WAV, FLAC, MP3 or AAC file in; its size is displayed.
Pick MP3 or AAC output and select a target bitrate from 64k to 256k.
Export to shrink the file and see the size reduction.
128 kbps is a good default for speech and music; lower for smaller files, higher for better quality.
MP3 and AAC are lossy, so very low bitrates lose detail — the bitrate options let you balance size and quality.
Dramatically — an uncompressed WAV converted to a 128k MP3 is often a tenth of the size.
No. This tool runs entirely in your browser — your file is processed on your own device and never leaves it. The only network request is an anonymous usage counter.