Compress audio to an exact size
Upload forms and email clients cap audio attachments in megabytes, and trial-and-error encoding wastes round trips. The tool reads your file's duration, divides your MB budget by it (with 2% headroom for container overhead) and encodes at exactly the resulting bitrate.
Drop your file here — or click to choose
audio file (MP3/WAV/M4A/FLAC/OGG/AAC) · up to 200MB each · processing starts instantly, preview is free
MB
No signup needed. Only pay if you want the clean file.
Frequently asked questions
Will it hit the target exactly?
Within a few percent. Very short files or budgets below the codec floor (~8 kbps) can deviate — the result notes say when a limit was applied.
MP3 or M4A for a size budget?
M4A/AAC sounds better at the same bitrate; MP3 wins when the receiving form only accepts .mp3.
When this tool is not the right choice
You need a specific sample rate instead of a size
use the sample rate converter
use the sample rate converter