Video Trimmer

How to trim a video

1. 1

   Choose a video

   Pick or drop one MP4, MOV, WebM, MKV or MPEG-TS file.

2. 2

   Set the section

   Drag the start and end handles under the video, or type exact times. Press Preview selection to watch just that part.

3. 3

   Pick a method and trim

   Precise cut re-encodes for exact frames; Fast cut copies without re-encoding. Press Trim Video, then play and download the result.

What to know

• Precise cut. The video is re-encoded so the picture starts and ends on the frames at your times, within about one frame. Audio is cut at its own packet boundaries, so it can differ by a few hundredths of a second. The saved length is checked to be within 0.25 seconds of your selection, and audio and video are checked to start within 0.25 seconds of each other. Re-encoding loses a little quality.
• Fast cut (not exact). The video and audio are copied without re-encoding, so quality is unchanged and it is quick. But video can only start on a keyframe, so the copy begins at the keyframe at or before your start. After the run the page tells you where it really began. The extra seconds before your start may remain inside the file: many players hide them, others show them. Use Precise cut when that matters.
• Which methods are offered. Precise cut needs your browser to decode and encode the video, and is not offered for HDR or wide-colour video. Fast cut keeps the original container (MP4, MOV, WebM or MKV) and is not offered for MPEG-TS, where only Precise cut works. If a method cannot work for your file, the page says why instead of switching quietly.
• Keyboard and touch. The two handles are sliders: arrow keys move the focused handle, Page Up and Page Down move it further. On a touch screen only a sideways drag moves a handle, so the page still scrolls when you swipe up or down. The start and end fields take times such as 75.5 or 1:15.5.
• One section only. The tool keeps a single section. Joining, several selections, cropping, effects and captions are not part of it.

Supported files

The tools open one MP4, MOV, WebM, MKV or MPEG-TS file at a time. Tested: H.264 video with AAC audio in MP4, MOV, MKV and MPEG-TS, VP9 video with Opus audio in WebM, and HEVC in MP4 (which can be muted and fast-cut anywhere, but only re-encoded where your browser can decode it). MPEG-TS means plain 188-byte .ts files; 192-byte camcorder and Blu-ray streams (.m2ts, AVCHD .mts) are not opened because their audio cannot be read reliably, and a fast cut is not offered for MPEG-TS. Other codecs inside these containers are tried, but whether they work depends on your browser; the tool says so in plain words when it cannot handle a file, and tells a damaged file apart from an unsupported one.

Only the main video track and its main audio track are used. Other tracks, subtitles, chapters and descriptive tags (title, location, creation tool) are not kept. The picture’s rotation and shape are kept, and the frame rate is never changed. Transparency is not kept when a video is re-encoded.

Limits

largest video file

500 MB

longest video

60 minutes

largest picture re-encoded

4K

largest result

500 MB

The video is read from your disk in small pieces, but the finished file is built in memory and then copied once for download, and decoded frames take memory while a run is going, so long or high-resolution videos can fail on phones and small computers. Speed depends entirely on your device and browser, and a run can take longer than the video itself. Cancel stops the work at once and keeps nothing.

Frequently asked questions