Audio Compressor
Shrink audio files by lowering the bitrate, with MP3, M4A or Opus output and an optional mono mix.
Processed in your browser: your files are never uploaded.
The video engine (FFmpeg) downloads once, about 31 MB, and then works offline in this tab. Processing runs on your own device, so long or 4K videos can take a while; keep the tab open until it finishes.
Audio Compressor
Audio files get too big for email, messaging apps and upload limits quickly, especially WAV recordings. This compressor re-encodes your file at a lower bitrate that still sounds good: 64 kbps is plenty for speech and podcasts, 128 kbps for music. Switching to mono halves the size again for voice recordings, and Opus gives the best quality for the smallest size.
How to use Audio Compressor
- Choose an audio file.
- Pick the target quality and format, and mono if it is speech.
- Click Compress audio.
- Compare the size, listen and download.
When it comes in handy
- Getting a recording under an email or WhatsApp size limit.
- Making podcast episodes quicker to download.
- Saving space on a phone.
Frequently asked questions
- How much smaller will my file be?
- A WAV file often shrinks by 90% or more. An MP3 that is already 128 kbps shrinks less, roughly in proportion to the new bitrate.
- Will it sound worse?
- Lower bitrates remove detail you mostly cannot hear. For speech, 64 kbps mono is hard to tell apart from the original; for music, stay at 128 kbps or above.
- Are my files uploaded?
- No. The video engine runs in your browser, so your files stay on your device. Only the engine itself (FFmpeg, about 31 MB) is downloaded, once.