Video Trimmer
Cut the beginning and end off a video right in your browser. Drag the handles on the thumbnail timeline or type exact times to the millisecond, loop the selection to check it, then save the trimmed clip with its sound. Your video is never uploaded.
Times as seconds (75.5) or minutes:seconds (1:15.5). Drag the handles or the green selection; with a handle focused, arrow keys move it 0.1 s (Shift: 1 s).
Good to know: the selected part is re-encoded while it plays in the background, so trimming takes as long as the clip (a 20-second cut takes about 20 seconds). Keep this tab open and visible until it finishes.
How to use the Video Trimmer
- Open your video: drop it on the box or press Choose video (MP4, WebM, MOV and more).
- Drag the green handles on the timeline to where the clip should start and end, or type exact times such as 1:05.250.
- Press Play selection to check the cut; tick Loop to repeat it.
- Choose quality and audio, then press Trim video. The clip is recorded in real time, so a 20-second cut takes about 20 seconds.
- Download the trimmed clip when it is ready.
Time formats you can type
The Start and End boxes accept plain seconds or clock-style times. Decimals give you millisecond precision, and a comma works as a decimal point too.
| You type | Means | In seconds |
|---|---|---|
| 12.5 | 12 and a half seconds | 12.5 |
| 1:05 | 1 minute 5 seconds | 65 |
| 1:05.250 | 1 minute 5.25 seconds | 65.25 |
| 0:00:42.1 | 42.1 seconds | 42.1 |
| 1:02:03 | 1 hour 2 minutes 3 seconds | 3,723 |
At 30 frames per second one frame lasts 1 ÷ 30 ≈ 0.033 s, at 25 fps 0.04 s and at 60 fps about 0.017 s, so moving a handle by 0.1 s with the arrow keys skips about 3 frames of a 30 fps video.
How the trimmer works
The page loads your file into a hidden video player, jumps to the start time, and plays the selection while drawing every frame onto a canvas. The canvas stream and the audio are fed to the browser's built-in MediaRecorder, which encodes a new WebM file, and recording stops when playback reaches the end time. This is why the export runs in real time and why it works without uploading anything.
The output bitrate follows the picture size: High uses about 0.14 bits per pixel per frame, Balanced 0.08 and Small 0.04 (at 30 fps). For a 1280 × 720 clip that is roughly 3.9, 2.2 and 1.1 Mbps, or about 29, 17 and 8 MB per minute including 128 kbps audio. Videos larger than 1920 pixels on the long side are scaled down to 1920 to keep real-time encoding smooth.
Tips for a clean cut
- Use Play selection with Loop ticked to hear whether the cut lands between words or beats.
- Pause the video on the exact frame you want, then press Set to current next to Start or End.
- Leave about 0.2 s of extra room at each end; a little padding looks more natural than a hard cut.
- To keep the original quality without re-encoding, cut at keyframes with a desktop tool such as ffmpeg (
-ss,-toand-c copy).
Frequently asked questions
How do I trim a video without uploading it?
Open the file in this page. The video is decoded, played and re-recorded by your own browser using the MediaRecorder API, so the file never leaves your device and there is no size limit other than your device's memory.
Why does trimming take as long as the clip?
Browsers cannot copy video frames without decoding them, so the trimmer plays the selected part in the background and re-encodes it as it plays. A 30-second selection therefore takes about 30 seconds. Keep the tab open and visible while it works.
What format is the trimmed video?
WebM (VP9 or VP8 video with Opus audio) in Chrome, Edge and Firefox, which plays in all modern browsers, VLC, and uploads fine to YouTube, Discord and most sites. Safari, which cannot record WebM, saves MP4 instead.
How precise is the cut?
You can set times to the millisecond. The exported clip starts on the frame at your start time and stops within about one frame of your end time; because recording runs in real time, a busy computer can occasionally add or drop a frame at the ends.
Will the quality get worse?
The clip is re-encoded, so there is a small quality loss, like any export. Choose High quality for the best result; Small file gives a lower bitrate for sharing in chat apps.
Which videos can I open?
Anything your browser can play: MP4 (H.264), WebM, and in most browsers MOV and MKV with common codecs. Some HEVC (H.265) or ProRes files only open in certain browsers; convert them to MP4 first if they do not load.