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DYNAMB

Trim video online — free, no watermark

Cut a video down to just the part you need, entirely in your browser. Drag the start and end handles on the timeline, preview the clip, and export it as an MP4 — the file never leaves your device, and there is no watermark or signup.

  • No upload — files stay on your device
  • Works offline once loaded
  • Free forever, no signup, no watermark
Drop a video here, or tap to choose MP4, MOV, WebM or MKV, up to ~500MB — nothing is uploaded

This file is over 500MB — trimming will still work, but expect it to take longer, especially on a phone.

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The clip is re-encoded so the cut lands on the exact frame you chose — that's what makes it frame-accurate, at the cost of a short wait instead of an instant copy.

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  • Original {{ sourceSizeLabel }}
  • Trimmed clip {{ resultSizeLabel }}
  • Length {{ clock(clipLength) }}

How to use this tool

  1. Drop your video

    MP4, MOV, WebM or MKV — any file up to about 500MB works comfortably.

  2. Set the start and end points

    Drag the two handles on the timeline or type exact times, and use the video preview to check the cut.

  3. Trim and download

    Hit Trim video — the clip is re-encoded so the cut lands on the exact frame, then download it as MP4.

Questions people ask

How do I trim a video without losing quality?

This tool re-encodes your clip using your device's hardware video encoder, so visual quality stays very close to the original — there is no generation loss from re-uploading or re-compressing an already-compressed file, because nothing is ever uploaded in the first place.

Why does trimming take a few seconds instead of being instant?

A truly instant trim can only cut on a keyframe, which means the start point can drift by a second or two. This tool re-encodes the clip instead, which takes a little longer but guarantees the cut starts and ends exactly where you set the handles.

Can I cut a video without re-encoding it?

Not with this tool — it always re-encodes to guarantee a frame-accurate cut. If you only need an instant, lossless cut and can accept the start snapping to the nearest keyframe, that is a different trade-off we may add as a separate mode later.

Is my video uploaded anywhere?

No. Trimming happens entirely inside your browser using the WebCodecs API built into Chrome and Edge. The file is read from your device and the trimmed clip is handed straight back as a download — nothing is sent to a server.

What formats can I trim?

MP4, MOV, WebM and MKV files in; the output is always MP4 (H.264 video, AAC audio), which plays everywhere.

Is there a length or size limit?

There is no hard limit, but files over roughly 500MB take noticeably longer to re-encode, especially on a phone. The tool warns you when a file crosses that size.

Related tools

Free because it costs us nothing to run: your browser does the work, not our servers. Made by Dynamb Technologies — we build software for businesses.