How to reduce audio size without uploading — browser tool
- Step 1Upload your audio file — Drop your audio.
- Step 2Set compression threshold and ratio — Set size target.
- Step 3Download the compressed audio — Download — your file never left the browser.
Frequently asked questions
What compression settings work best for podcasts?+
A good starting point for podcast voice: threshold −18 dB, ratio 3:1, attack 10ms, release 200ms. This is a moderate compression that tightens dynamics without sounding pumping. For louder, more aggressive radio-style compression: threshold −24 dB, ratio 6:1, attack 5ms, release 100ms.
What is the difference between compression and normalisation?+
Normalisation adjusts overall gain to a single target level — it raises or lowers the entire file by a constant amount. Compression dynamically adjusts gain moment-by-moment, reducing loud parts and (after make-up gain) raising the overall perceived loudness. Compression changes the shape of the dynamics; normalisation only changes the overall level.
Can too much compression make audio sound bad?+
Yes — over-compression (high ratio, low threshold) creates a flat, lifeless sound that is fatiguing to listen to. It can also produce pumping artefacts where the volume noticeably rises and falls with the programme. Apply enough compression to control peaks and improve consistency, but leave some dynamic life in the recording.
Privacy first
All audio processing runs locally in your browser using FFmpeg compiled to WebAssembly. No file is ever uploaded — only metadata counters are saved for signed-in dashboard stats.