Free is enough for most one-off jobs. Pro raises the file and batch caps; Pro + Media unlocks GB-scale streaming and unlimited duration.
Larger files supported on Developer (5 GB CSV) and Enterprise (unlimited). All processing happens in your browser — files never reach a server.
Drop your audio file
Pick a target bitrate (CBR or VBR)
Download the re-encoded file
0 bytes uploaded. Bitrate Changer runs entirely in your browser using FFmpeg.wasm 8.1, RNNoise, and the Web Audio API. Your audio stays on your device at all times. No data is sent to any server — critical for sensitive interviews and confidential calls.
VBR (variable bitrate) gives better quality at the same average size but isn't supported by every player. CBR (constant) is universally compatible.
Hit a specific file size (5 MB, 16 MB, 25 MB, 100 MB). JAD calculates the right bitrate for your duration and target.
Open toolResample audio to 8, 16, 22.05, 44.1, 48, 88.2, 96, or 192 kHz. High-quality polyphase resampling via FFmpeg.
Open toolEncode WAV files to MP3 with selectable bitrate (64-320 kbps). LAME-quality encoding via FFmpeg 8.1 — locally.
Open tool