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Video Trimmer

Cut a clip out of a video by start and end time, without uploading it.

To trim a video, add the file and enter the start and end times as seconds, m:ss or h:mm:ss. Stream copy is near-instant but cuts at the nearest keyframe, so enable re-encoding when you need the cut to land on an exact frame.

Runs in your browser
Engine
FFmpeg compiled to WebAssembly
First run
Downloads ~30 MB of FFmpeg core, then cached
Upload
None — the file never leaves your device
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why did my cut start slightly early?

Without re-encoding, FFmpeg copies streams and can only cut at keyframes, which may be a second or two before your chosen point. Enable re-encoding for a frame-accurate cut at the cost of processing time.

Why is the first run slow?

The FFmpeg WebAssembly core is about 30 MB and downloads once per session. After that it stays in the browser cache, and subsequent conversions start immediately.

Is my video uploaded anywhere?

No. FFmpeg runs inside your browser as WebAssembly, so the file is read from disk into memory and never sent to a server. That is also why there is no file size limit beyond your available RAM.

Why is it slower than desktop FFmpeg?

WebAssembly runs single-threaded here and cannot use your GPU, so encoding is typically several times slower than a native build. For a short clip that is fine; for a feature-length film, use desktop FFmpeg.

How to use the video trimmer

  1. 1Select your video file — the file stays on your device and is never uploaded.
  2. 2Enter or paste your start.
  3. 3Enter or paste your end.
  4. 4Turn "Re-encode for a frame-accurate cut" on or off as needed.
  5. 5Press Run, then download the result when it is ready.

Embed this tool

Put the working video trimmer on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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