Utilumo
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Guide1 min readUpdated August 12, 2026

How to edit a video in your browser

Short answer

Common quick video edits — cutting, splitting, looping, muting, and replacing audio — can run entirely in the browser and export MP4. No upload or install is needed because the video is processed in the tab.

Small video jobs, no install

You often do not need a video editor — you need one small change: shorten a clip, mute it, loop it, or split it into parts. Modern browsers can do each of these locally, so the file stays on your device and you get an MP4 back.

The common edits

  1. Cut / trimKeep only the part you need by setting a start and end. The quickest way to shrink a clip and drop dead air.
  2. SplitBreak one long video into several MP4 parts — for chapters, uploads, or sharing sections separately.
  3. LoopRepeat a short clip a number of times into one longer MP4 — useful for backgrounds and social loops.
  4. Mute or swap audioRemove a video's audio track, or add your own music or voiceover in its place.
Output is MP4These edits export MP4 (H.264), which plays almost everywhere. If you need a different container or codec, convert afterwards.
Try it: Cut VideoTrim a video to a start and end, exported as MP4, locally.Open tool
Try it: Split VideoSplit a video into MP4 parts locally in your browser.Open tool
Try it: Loop VideoRepeat a clip into a longer looped MP4 locally.Open tool
Try it: Remove Audio from VideoMute a video and export MP4 locally.Open tool
Try it: Add Audio to VideoAdd your own audio track to a video locally.Open tool

References

Questions

Can I edit video without uploading it?

Yes. These tools process the video in your browser tab, so the file never leaves your device — no upload and no account.

Why is the output always MP4?

MP4 with H.264 is the most compatible format, so it is a safe default for sharing. If you need WebM, MOV, or MKV, run the result through a converter.

Does this send my data anywhere?

No. Utilumo's developer tools parse and transform input inside the browser tab. Nothing is uploaded, stored, or logged.

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