How to compress audio in three steps
Add the recording
Drop an MP3, WAV or M4A onto the compressor. DigiCompress verifies the file’s signature before it starts.
Choose a quality level
Speech sounds fine at low bitrates; music benefits from a higher setting. Pick the one that fits.
Download and clear
Save the smaller file. The original and the result are then released from the tab’s memory.
Recordings are some of the most private files you have
Audio files capture what people actually said: interviews with sources, therapy or medical notes, legal consultations, private voice messages, unreleased tracks. They’re also often huge — an hour of uncompressed WAV can run past 600 MB — which is why people go looking for a compressor in the first place.
DigiCompress encodes the audio with FFmpeg running in your browser, so the recording is never uploaded and never transcribed, analysed or stored by anyone. We see only that an audio file of a given size was compressed.
Getting the right size and sound
- WAV shrinks the most
- WAV is uncompressed, so converting a WAV recording usually saves 80–90% of its size with no audible difference for speech.
- Speech needs less
- Voice notes, lectures and interviews sound clear at low bitrates. Save higher settings for music.
- Don’t over-squeeze MP3s
- An MP3 is already compressed. Re-compressing a small, low-bitrate MP3 saves little and can add artefacts.
- Mono for single voices
- A single speaker recorded in stereo stores the same sound twice. Mono output can halve the size.
Supported formats and limits
| Format | Extensions | Max size | Typical source |
|---|---|---|---|
| MP3 | .mp3 | 2 GB | Music, podcasts, downloads |
| WAV | .wav | 2 GB | Recorders, studio exports |
| M4A / AAC | .m4a | 2 GB | iPhone Voice Memos, exports |
Have a video and only care about the sound? Try the video compressor to keep both, or extract the audio first in your editor.