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TabBench

Cut Video

Trim a video to any start and end point without re-encoding — instant and lossless.

Runs in your browser. Nothing you add is uploaded.

What the Cut Video does

Cutting a clip out of a video is usually the last thing standing between you and sending it — the interesting thirty seconds sit inside a four-minute recording, and everything you try either wants an account or spends ten minutes re-encoding. This trims by copying streams instead of re-encoding, which finishes almost instantly and loses nothing at all.

How to trim a video online

  1. Upload the video. It plays immediately from your device — nothing is sent anywhere.
  2. Drag the start and end handles. The preview jumps as you move them, so you can hear exactly where the cut lands.
  3. Check the clip length shown underneath.
  4. Press Trim & download. The first run fetches the video engine (about 32MB, once per browser); after that it is near-instant.

The Cut Video runs entirely in your browser — nothing you enter is uploaded, stored, or logged.

When to use it

Sending only the part that matters

A message limit or an attachment cap usually is not a size problem so much as a length problem. Cutting to the relevant thirty seconds solves both at once.

Removing dead air at the start and end

Screen recordings almost always begin with fumbling for the stop button. Trimming both ends takes seconds and makes a recording look deliberate.

Pulling a clip out of a longer recording

Grabbing one exchange out of a meeting recording, without opening an editor or re-exporting the whole file.

Good to know

  • Cuts land on the nearest keyframe before your start point — usually within a second or two. That is the trade for it being instant and lossless.
  • The engine downloads once per browser and is then cached, so the first cut is slower than every one after it.
  • MP4 and WebM copy cleanly. MKV and unusual codecs sometimes cannot be stream-copied and will report an error rather than produce a broken file.
  • Your original file is never modified — the trim downloads as a new file.

Frequently asked questions

Does trimming reduce quality?

No. The cut copies streams rather than re-encoding, so the output is bit-identical to the source within the range you kept.

Does trimming reduce the quality?

No, and this is the main reason to use a stream copy. The kept portion is copied bit-for-bit rather than decoded and re-encoded, so the output is identical to the source within that range. Tools that re-encode lose a generation of quality every time.

Why is my cut slightly off from where I set it?

Because a stream copy has to begin at a keyframe, and keyframes typically occur every one to two seconds. Landing exactly on an arbitrary frame would require re-encoding the whole clip, which in a browser would take minutes rather than seconds and would cost quality.

Why does the first trim take longer?

The video engine is about 32MB and downloads the first time you use it. Your browser caches it afterwards, so subsequent trims — and the audio remover, which shares the same engine — start immediately.

Is my video uploaded?

No. The processing runs inside your browser through WebAssembly, so the file never leaves your device. That is unusual for a video tool and is why this works on footage you would not hand to a website.

Is there a file size limit?

The practical limit is your device's memory, since the file is held in the tab while it is processed. Clips of a few hundred megabytes are fine; multi-gigabyte files may exhaust memory on a phone.

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