Video Trimmer
Video Trimmer is a free online video converter for changing MP4, WEBM, MKV, MOV, and AVI files into MP4 files. Video Trimmer accepts 6 MIME types, returns video/mp4, includes 3 settings, and runs in your browser on the device.
Drop .mp4 / .webm / .mkv / .mov / .avi file here
or click to choose
Options
Key facts
- Input
- 5 formats: MP4, WEBM, MKV, MOV, and AVI (video/mp4, video/webm, video/x-matroska, video/quicktime, video/x-msvideo, video/avi)
- Output
- MP4 (video/mp4)
- Runtime
- your browser on the device
- Settings
- 3 controls: Start time, End time, and Cut mode
- File mode
- 1 input file creates 1 output file
- Cost
- $0, no account required
How to use Video Trimmer
- 1
Open your MP4, WEBM, MKV, MOV, AVI file
Drop your MP4, WEBM, MKV, MOV, AVI file onto the page, or click to browse and pick one from your device.
- 2
Choose options
Adjust the conversion options to suit your needs. Defaults work well for most inputs.
- 3
Convert and download
Click Convert. Your MP4 file is ready to download in seconds.
Video Trimmer details
First, Video Trimmer reads MP4, WEBM, MKV, MOV, and AVI source files and prepares MP4 output for the video workflow. Next, The visible controls are Start time, End time, and Cut mode. Additionally, Files and text stay in the browser session.
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. Video Trimmer 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.
Common searches
- video trimmer
- trim video
- cut video
- video cutter
- video editor
- trim 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 MOV
Convert MP4 video to MOV (QuickTime) — free online, no upload.
MP4 to MP3
Extract the audio track from an MP4 video as an MP3 file — free online.
MP4 to WAV
Extract the audio track from an MP4 video as an uncompressed WAV file.
MP4 to FLAC
Extract the audio track from an MP4 video as a FLAC file — free online.
Frequently asked
What is Video Trimmer?
Video Trimmer is a free online video converter for changing MP4, WEBM, MKV, MOV, and AVI files into MP4 files. Video Trimmer accepts 6 MIME types, returns video/mp4, includes 3 settings, and runs in your browser on the device.
What files does Video Trimmer accept and create?
Video Trimmer accepts MP4, WEBM, MKV, MOV, AVI files (video/mp4, video/webm, video/x-matroska, video/quicktime, video/x-msvideo, video/avi) and creates MP4 files (video/mp4). The page includes 3 settings: Start time, End time, and Cut mode.
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 do I use Video Trimmer?
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 is 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.