Cut an MP3 file online
Trim an MP3 by choosing a start and end second, directly in your browser, no complex editor needed.
or click to select it
Cut an MP3 down to just the part you need by picking a start and end second — no waveform editor, no software to install. Upload the file, QuickToolio reads its exact duration, and you type the two numbers that bound the section you want to keep.
The tool re-encodes only the range between your start and end second, discarding everything outside it. Because it decodes the original MP3 and writes a brand-new one rather than splicing compressed audio frames together, the cut point lands exactly on the second you typed instead of snapping to the nearest frame boundary.
Use cases
- Cut a 20-second ringtone snippet out of your favorite song.
- Remove a long silent intro or outro before sharing a recording.
- Extract just the chorus of a track to send to someone.
How it works
- 1
Upload your MP3
Drop the file in or select it from your device; QuickToolio automatically detects its total duration.
- 2
Set the start and end second
Type the exact second where the clip should start and where it should end — the fields are bounded to the file's real length.
- 3
Download the trimmed MP3
Once processing finishes, download the cut section as a new MP3 file.
Technical details
Runs ffmpeg.wasm entirely in your browser. It seeks to the start point before decoding (rather than decoding the whole file and discarding the unwanted part), which keeps even large MP3s fast to cut, then re-encodes the kept section with libmp3lame at a high variable bitrate (~V2, roughly 170-210 kbps) regardless of the source file's original bitrate.
Frequently asked questions
Why doesn't the cut start or end exactly where I expect?
It should — unlike tools that copy compressed audio frames as-is, this one decodes the MP3 and re-encodes only the selected range, so the boundary matches the second you entered. Double-check the duration shown after upload; it reflects the real file length, not an estimate.
Is there a file size limit?
MP3 files up to 300 MB work reliably in most browsers.