Compress audio
Get a recording down to a size that will actually send. For music, turning the quality down a step is usually all it takes. For speech, switching to a single channel halves it again with nothing you can hear. Listen to the result before you commit to it.
How to use it
- 1 Add your audio files.
- 2 Pick a format and a quality level.
- 3 For speech, switch to a single channel. It halves the size and you will not hear it.
- 4 Listen to the preview, then download.
Formats this tool accepts
Each one has a reference page covering what it stores and where it is supported.
Questions about compress audio
What bitrate should I use?
For music in MP3, 192 kbps is transparent to most listeners and 320 kbps is the practical ceiling. For a podcast or voice recording, 64 to 96 kbps in mono sounds fine and produces a file a fraction of the size. Opus does the same job at roughly half those numbers.
Does compressing lose quality permanently?
Yes. Lossy encoding discards audio the model considers masked, and it cannot be recovered by re-encoding upward later. Always compress from the highest quality source you have, not from an already compressed copy.
Why is my compressed file barely smaller?
Usually because the source was already at or below the bitrate you asked for. Re-encoding it then costs quality without saving space. Check the original bitrate first and only go down from there.
Are my files uploaded to a server?
No. The whole thing runs inside the browser tab you already have open. Your file is read straight from your own disk, worked on there, and handed back as a download. Nothing is sent anywhere, nothing is stored, and there is no account and no queue.
Is there a file size limit?
There is no server-side limit because there is no server. The practical ceiling is your device memory, since the file and its output both have to fit in the tab. Files up to a few hundred megabytes are usually fine on a desktop machine, while phones and older laptops will struggle sooner. If a large file fails, close other tabs and try again.
Does it work offline?
Yes, once the page has loaded once. The engine is cached by the browser, so you can turn off your connection, reload the page and keep working. That is a useful side effect of doing the processing locally rather than a separate offline mode you have to enable.
Other audio tools
Popular audio conversions
Pairs people convert most often in this category, each on its own page.