Video Trimmer
Trim and cut video files to the desired length
Video Trimmer cuts a clip between start and end times using FFmpeg compiled to WebAssembly — the file is processed inside your browser's memory and never uploaded anywhere.
Content reviewed: August 24, 2026
Encrypted with HTTPSProcessed in your browser
All processing runs locally in your browser. Your files and text are not sent to Tool-web's server.
Actions:
How to Use
- Upload your video file
- Set start and end points using the timeline
- Preview the selection
- Download the trimmed video
Features
- Precise timeline selection
- Preview before download
- Supports MP4, WebM, AVI
- Frame-accurate cutting
- No re-encoding option
Tips for getting Video Trimmer right
- First use downloads the ~30 MB FFmpeg core; subsequent trims run offline-fast
- Stream-copy mode cuts instantly but snaps to nearby keyframes — expect ±a-few-second precision on long-GOP footage
- Very large files hit browser memory limits; trim in segments if a 2 GB recording refuses to load
How the cut works
The tool invokes ffmpeg -ss <start> -i input -t <duration> -c copy output. Stream copy avoids re-encoding, which keeps quality identical and speed near-instant — the tradeoff is that cuts land on keyframes rather than exact frames.
Precision vs speed
| Approach | Speed | Precision | This tool |
|---|---|---|---|
| Stream copy (-c copy) | Seconds even for GB files | Keyframe-snapped (±seconds) | Yes |
| Full re-encode | Minutes; heavy CPU | Frame-exact | No |
Troubleshooting
- Cut includes extra footage at the start? That's keyframe snapping — nudge the start time later
- Processing stuck at 0%? The WASM core may still be downloading; check the network tab
- Audio drift after cutting? Rare stream-copy artifact on variable-frame-rate sources
Frequently Asked Questions
What video formats are supported?
The tool supports MP4, WebM, MOV, AVI, and MKV video formats.
Does trimming reduce quality?
The tool offers a stream copy mode that cuts without re-encoding, preserving original quality.
What is the maximum file size?
The tool can handle video files up to 2GB depending on your browser's memory capacity.
Privacy & Security
Trimming runs via FFmpeg.wasm entirely in your browser. Video files never leave your machine.
Tips & Best Practices
- First use downloads the ~30 MB FFmpeg core; subsequent trims run offline-fast
- Stream-copy mode cuts instantly but snaps to nearby keyframes — expect ±a-few-second precision on long-GOP footage
- Very large files hit browser memory limits; trim in segments if a 2 GB recording refuses to load
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