Video Trimmer

The Video Trimmer plays your chosen section back in real time and re-records it frame by frame from a canvas, which means the output is re-encoded video with no audio track.

What is the Video Trimmer?

A desktop trimmer usually cuts without re-encoding: it copies the compressed stream untouched and can only start at a keyframe, which is why a cut sometimes lands a fraction of a second off where you asked. A browser page cannot do that, because it has no access to the compressed stream. This tool takes the only route available and captures playback, drawing frames onto a canvas roughly every 33 milliseconds and recording that canvas at 30 frames per second, so the result is a genuinely new encode at your video's original pixel dimensions and, importantly, without sound.

Key Features

• Start and end sliders with live start, end and duration readouts
• Set Now buttons take the current playhead as either edge
• Canvas capture keeps the source pixel dimensions, capped at 30 fps
• Output written by MediaRecorder, in practice WebM with VP9
• The entire cut happens in the tab, with nothing uploaded

Common Use Cases

• Pulling a silent twenty-second clip out of a screen recording for a bug report
• Cutting the dead air off the front of a phone video
• Making a short muted loop for a website background
• Grabbing one moment from a long game capture to share

How to Use the Video Trimmer

1. Drop in a video your browser can actually play, such as MP4 or WebM.
2. Scrub the player to your in-point and press Set Now under Start.
3. Do the same under End, then check the Duration box between them.
4. Leave the format on WebM unless you are happy with a renamed file.
5. Press Trim and Download, then leave the tab visible until it finishes.

Tips for Best Results

• The cut runs in real time, so a five-minute selection takes five minutes to record.
• Sixty-frame footage is resampled down to 30 fps, and fast motion will look less smooth.
• Keep the tab in the foreground, because background tabs throttle the frame capture.
• If you need the sound, trim the audio separately and recombine both in a real editor.

Why Use WiserWork's Video Trimmer?

The reason to use this page is that the video never leaves your machine, which is exactly what you want for a screen recording full of internal dashboards or a personal clip you would rather not hand to an upload form. The reason to be careful is that the browser gives it no way to copy the compressed stream, so every export is a fresh encode at 30 fps and the audio is dropped. For a short, silent clip that is a fair trade; for anything with dialogue it is not.

Who Uses the Video Trimmer?

Support engineers and testers use it constantly, because a bug report clip is short, silent and often shows something confidential. Social posters trim the slow start off a phone video before uploading. Web developers make small muted background loops without opening an editor.

Frequently Asked Questions

Does the trimmed clip keep its audio?

No. Only the canvas is captured, and a canvas carries picture but no sound, so the file you download is silent. This is the single most important thing to know before using it.

Does it re-encode, or does it copy the original stream?

It always re-encodes. Copying a compressed stream requires access to the container and its keyframes, which a web page does not have, so playback is captured and encoded fresh.

Why do keyframes matter in other trimmers but not here?

Because a stream-copy trimmer can only begin a clip at a keyframe, it may shift your in-point by a fraction of a second, but it costs no quality. Re-encoding lets this tool start exactly where you asked, at the price of a second generation of compression.

I chose MP4 but the file behaves like a WebM. Why?

The tool asks MediaRecorder whether it can write the container you picked, and browsers generally cannot write MP4, MOV, AVI or MKV. It falls back to WebM with VP9 while still naming the file with the extension you selected.

Why does trimming take as long as the clip itself?

Because the clip is captured by playing it. A two-minute selection needs two minutes of playback to record, and there is no way to speed that up from inside the page.

Is the waveform behind the sliders real?

No, those bars are randomly generated decoration and have nothing to do with your file's audio. Use the video player itself, along with the Set Now buttons, to find your in and out points.

What resolution and frame rate does the output have?

The canvas matches the video's own width and height, falling back to 640 by 360 if the browser has not reported them, and capture runs at 30 frames per second regardless of the source rate.

Will AVI or MKV files load?

Only if your browser can play them, and most cannot. If the player stays blank after you drop a file in, that format is unsupported and converting it first is the only route.

How precise are the start and end points?

Each slider divides the video into a thousand steps, so precision scales with length: fine on a one-minute clip, around seven seconds per step on a two-hour recording. Set Now still snaps to those same steps.

Is my video uploaded anywhere?

No. The file is loaded straight into the page's video element and the capture happens on your own machine, so nothing is transmitted to any server.

This is the right tool for a short, silent clip you would rather not upload, and the wrong one for anything with dialogue or a long runtime. Know that before you start a five-minute export.