Trim Audio
Trim and cut audio to a tenth of a second, with fades
Click or drop an audio file hereChoose an audio file
About Trim Audio
Trim Audio keeps one section of an audio file, from a start to an end set to a tenth of a second, and drops the rest; it cannot remove a passage from the middle. Without a fade, compressed audio is copied without re-encoding and keeps its format; WAV, AIFF, and 16-bit FLAC are cut to the exact sample in their own format. A fade-in or fade-out re-encodes the audio: MP3, OGG (Vorbis), M4A, and AAC at a high setting, WAV, AIFF, and FLAC losslessly, and every other format as WAV; an Apple Lossless .m4a then becomes AAC, and Opus in an .ogg file becomes Vorbis. The cut is made by ffmpeg.wasm on your device.
How to trim an audio file
- 1Pick or drop the audio file; "Kept" then shows how long the section will be.
- 2Set "Start" and "End" by typing seconds, moving the sliders, or playing and clicking "Set to the player's position".
- 3If you want, enter a "Fade in (seconds)" and a "Fade out (seconds)".
- 4Click "Trim audio", listen, then click "Download" to save trimmed_ followed by your file name.
Formats and limits
- Input formats
- MP3, WAV, M4A, AAC, FLAC, OGG, OGA, Opus, WMA, AC3, AIFF, AIF, AMR, MKA, WEBA, CAF, MP2, M4B, M4R, WV, AU
- Output format
- The source's format; with a fade, MP3, WAV, FLAC, OGG, M4A, AAC, and AIFF keep theirs and other formats become WAV
- Precision
- Times to a tenth of a second; exact sample for WAV, AIFF, 16-bit FLAC, and faded files; nearest audio frame for other copied files
- Fades
- In and out, each up to 30 s in tenths of a second; together no longer than the part kept
Common uses
- An interview with a slow start
- A WAV interview that opens with two minutes of sound checks: set "Start" after them, and the file is cut to the exact sample and stays WAV, rewritten sample for sample without loss.
- A voice memo to forward
- An M4A voice memo whose useful part is in the middle: play it, click "Set to the player's position" at the right moments, and only that part is saved, still as M4A.
- Music under a video or a slideshow
- A track that must fit a 45-second clip: keep 45 seconds, add a 1-second fade-in and a 3-second fade-out, and an MP3 comes back as an MP3, re-encoded at a high setting because of the fades.
- A lossless excerpt
- A few seconds of a 16-bit FLAC album track for a presentation: the cut lands on the exact sample and the excerpt stays lossless FLAC.
Which tool to use
- Split Audio: Split Audio keeps every piece: it cuts one file at a point, into 2 to 100 equal parts, or every N seconds, in a format you choose. Trim Audio keeps a single stretch and drops the rest.
- Trim Video: Trim Video cuts a video file and keeps its picture with all of its audio tracks, without fades. Use it when the sound has to stay with the image.
- Video to Audio: Video to Audio saves the whole soundtrack of a video in one of 19 audio formats without cutting it; trim the result here afterward.
Where your file is processed
Trimming happens on your device: ffmpeg.wasm, downloaded from unpkg.com the first time, cuts the file inside the browser tab, and the audio is not sent to any server. If a trim fails, the cleaned error message, your file's extension and size range, and your browser's name and version reach our error log.
Frequently asked questions
Can I remove a part from the middle of a song?
No. The trimmer keeps one continuous section, from "Start" to "End". To drop a middle passage, split the file at both ends with Split Audio and join the two outer parts with Merge Audio.
Will trimming reduce quality?
No, without fades: compressed files are copied as they are, and WAV, AIFF, and 16-bit FLAC are rewritten sample for sample. A fade needs a new encode; MP3, OGG, M4A, and AAC are then written at a high setting and lose a little, and an Apple Lossless .m4a is saved as AAC.
Is the cut exact to the millisecond?
No, the times are set to the tenth of a second. From there, WAV, AIFF, 16-bit FLAC, and any file with a fade are cut to the exact sample, while a copied MP3 or other compressed file starts on the nearest audio frame: 0.3 to 39.5 ms late in our test of September 27, 2026.
Can I make an iPhone ringtone with it?
Yes, in two steps: keep at most 40 seconds here, then convert the result to M4R with Audio Converter. A short fade-out avoids an abrupt stop when the ringtone loops.
Which audio formats can I trim?
MP3, WAV, M4A, AAC, FLAC, OGG, Opus, WMA, AIFF, AMR, and others such as AC3, CAF, and M4B, 21 file extensions in all. Without a fade, the trimmed file keeps the format it came in.
How large a file can I trim?
750 MB on a computer and 300 MB on a phone or tablet. The whole file is copied into the browser tab's memory for ffmpeg.wasm, with the trimmed copy; a browser stops the work above about 1 GB on a computer, and much lower on a phone, so a larger file is refused as soon as you choose it.
Can I trim the sound of a video?
Not directly, because the file picker here asks for audio files. Pull the sound out with Video to Audio, then trim that file; to cut the picture and its sound together, use Trim Video.
Do fades make the clip shorter?
No. A fade-in starts at "Start" and a fade-out ends at "End", both inside the kept part, so the length shown next to "Kept" stays the same; the two fades together cannot exceed that length.
Tips and tricks
- ✓Play the file, pause where the section should begin, and click "Set to the player's position" under Start.
- ✓On a format your browser cannot play, such as WMA, type the start and end: there is no player, but trimming works the same.