Video Trimmer
Trim a video down to just the part you want. Enter a start and end time — in seconds ("30"), MM:SS ("1:15"), or HH:MM:SS ("0:01:15") — and download the clip as MP4. The default "Fast (copy)" mode is essentially instant because it copies the existing H.264 stream without re-encoding, but cut points snap to the nearest keyframe — your clip may start a second or two earlier than requested. Pick "Re-encode H.264" for a sample-accurate cut at the cost of encoding time. Everything runs locally via ffmpeg.wasm; the file never leaves your device. Re-encoded outputs are also downscaled to a 1080p ceiling so the browser doesn't run out of memory on 4K sources.
Drop .mp4 / .webm / .mkv / .mov / .avi file here
or click to choose
Options
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Supports
.mp4, .webm, .mkv, .mov, .avi → .mp4
Related tools
Tools that work with the same formats — most users open one of these next.
Compress Video
Shrink a video file by re-encoding to H.264 with a quality preset — free, in-browser.
MP4 to WebM
Convert MP4 video to WebM (VP9 + Opus) — free, runs entirely in your browser.
MP4 to MKV
Remux MP4 to Matroska (MKV) — fast, lossless, no re-encoding.
MP4 to MOV
Convert MP4 video to MOV (QuickTime) — free online, no upload.
MP4 to GIF
Convert MP4 video to an animated GIF — free online, with a tuned palette.
MP4 to MP3
Extract the audio track from an MP4 video as an MP3 file — free online.
Frequently asked
Is Video Trimmer free to use?
Yes. Video Trimmer is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — Video Trimmer runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does Video Trimmer work?
Open Video Trimmer, drop in your MP4, WEBM, MKV, MOV, AVI file, choose any options, and click Convert. Your browser does the work locally and produces a MP4 file you can save right away.
What's the maximum file size for Video Trimmer?
Because Video Trimmer runs in your browser, the maximum size depends on your device's available memory. Most modern phones and laptops handle files up to a few hundred MB without issues.