Compress an audio file until it fits
Reduce bitrate, sample rate or channels to shrink a recording. Perfect for podcasts, voice notes and files that are too big to email.
How it works
Choose your audio file
Your track is opened on your own device.
Lower the bitrate
This is the single biggest factor in file size.
Consider mono
For speech, a single channel can halve the size with little loss.
The track is opened, not sent
Editing audio normally means uploading the file and hoping the service is trustworthy. Here your browser opens the track from your disk, works on it in place, and saves the result back. The audio never crosses the network.
- Opened from your disk by your browser — not sent anywhere first.
- Held in the tab while the tool works, then dropped.
- Saved to your device by your browser, not by a link to a server.
- Closing the tab clears the working copy completely.
- No account, so nothing is ever attached to an identity.
- No tracking of what you worked on or what was inside the file.
There is no queue, no render farm and no waiting room. The track is worked on in front of you and released the moment the tab closes. The how it works page covers what actually happens inside the tab, and our DevTools guide shows how to confirm 0 bytes are uploaded.
What people use it for
Getting a podcast under a hosting limit
Lowering the bitrate and dropping to mono is usually enough to fit inside an episode cap.
Sending a voice note that is too long
A ten-minute recording is a lot to ask someone to play. Trim it to the useful minute and it actually gets heard.
Fitting an episode inside a feed limit
Podcast hosts set a maximum size. Checking the result here saves a failed upload later.
Keeping a copy that will still open in ten years
A widely supported format is a safer long-term bet than a container only one app understands.
Formats & limits
What this tool accepts, what it produces, and what it will never ask you for.
- Input
- MP3, WAV, M4A, OGG, FLAC and AAC
- Output
- MP3, WAV, M4A, FLAC or OGG
- Maximum file size
- Set by your device, not by a plan
- Files per run
- One at a time
- Sign-up required
- None
- Watermark
- Never added
- Works offline
- Yes, once the page has loaded
- Supported browsers
- Any current Chrome, Edge, Firefox or Safari
When something goes wrong
Corrupt files, and formats outside the list above, stop with a plain message rather than a spinner that never finishes. If a track plays in your music app it will normally open here.
The audio container is not one the browser can read. Convert it to MP3 or WAV first, then run it through again.
Why not an upload site
An upload-based audio editor sends your recording to a server and sends the result back. Removing that round trip removes the waiting, the caps and the copy of your file.
A typical upload site
This tool
Questions
How small can I make a file?
It depends on the content. Speech stays clear down to 64 kbps in mono. Music generally needs at least 128 kbps to remain pleasant, and 96 kbps or below becomes noticeably dull.
What does the loudness evening option do?
It raises quiet passages and lowers loud ones so the overall volume is more consistent. This is useful for podcasts and lectures, but it changes the original dynamics.
Will compressing a WAV to MP3 lose quality?
Yes, but by an amount you choose. MP3 is a lossy format, so some detail is discarded. At 192 kbps or above, most listeners cannot tell the difference in everyday listening.
Is there a file size limit?
No fixed limit is imposed by the tool. The practical ceiling is how much memory your device has free, because the whole job runs inside this browser tab.
Does it work without an internet connection?
Yes, once the page has loaded. Nothing is fetched while you work, so a dropped connection does not interrupt a run.
Do I need an account or an email address?
No. There is nothing to sign up for, and nothing is ever attached to an identity because no file leaves your device.