Video Trimmer & Cutter
Upload a video, set start and end times, and download your trimmed clip instantly.
All processing happens in your browser — your files are never uploaded.
How to use Video Trimmer & Cutter
The Video Trimmer lets you cut any portion of an MP4, WebM, MOV or MKV video by setting a precise start time and end time, then exports the clipped segment — entirely in your browser without uploading the file to any server. Ideal for removing intros and outros, isolating a highlight clip, or shortening a screen recording before sharing.
- Click "Select Video" and open your video file (MP4, WebM, MOV or MKV).
- Use the timeline scrubber or type exact timestamps to set the start and end of the clip.
- Preview the trimmed segment using the built-in player to confirm the cut points.
- Choose whether to re-encode the clip or perform a fast keyframe-accurate cut.
- Click Trim, then download the exported clip when processing completes.
Your data never leaves your device — 100% private processing.
Re-encode vs keyframe cut
A keyframe (stream-copy) cut is nearly instantaneous because the video data is not decoded and re-encoded — the tool simply finds the nearest keyframe to your chosen timestamp and copies the stream. The trade-off is that the actual cut point may be slightly off from your target. A full re-encode is slower but delivers frame-accurate cuts and lets you change the output format or resolution at the same time. For most social-media clips, a keyframe cut is the faster, practical choice.
| Method | Speed | Frame accuracy | Output size |
|---|---|---|---|
| Keyframe cut | Very fast | Near the keyframe | Same as source |
| Full re-encode | Slower | Exact frame | Depends on codec |
Supported video formats for trimming
The trimmer accepts the most widely used video containers: MP4 (H.264/H.265), WebM (VP8/VP9/AV1), MOV (QuickTime) and MKV (Matroska). Audio tracks are preserved in the output. Subtitle and chapter metadata embedded in the source file are also retained when you use the stream-copy method, keeping your clip self-contained.
Glossary
- Keyframe
- A fully encoded video frame used as a reference; frames between keyframes store only the difference from the nearest keyframe.
- Stream copy
- Copying audio or video data from source to output without decoding or re-encoding, which is extremely fast.
- Re-encode
- Fully decoding compressed media and compressing it again, which is slower but allows precise cuts and format changes.
- Timestamp
- A position in a media file expressed as HH:MM:SS.mmm, used to specify start and end points for trimming.
- GOP (Group of Pictures)
- A sequence of frames between two keyframes; the length of the GOP determines how close a keyframe cut can be to a target time.
Related reading
Frequently Asked Questions
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Why use Video Trimmer & Cutter?
- Powered by FFmpeg running directly in the browser — no upload needed
- Supports all major video and audio formats
- Lossless and lossy options for quality control
- Export results immediately without waiting for cloud processing
Common use cases
- Compress a video before uploading to Google Drive
- Extract audio from a video lecture for easy listening
- Trim a video clip for a social media reel
- Convert MOV files to MP4 for cross-platform compatibility
- Merge two audio tracks for a podcast episode
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