Video Trimmer

How Video Trimmer works

Cut a section out of any video and save it as WebM. Playback from the start point is recorded in real time, so a 10-second cut takes 10 seconds. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

How a cut is made in the browser

The tool plays the video, captures its frames as a media stream, and records that stream with MediaRecorder for the duration you ask for. The result is a WebM file containing exactly the seconds you selected.

Because it records rather than re-encodes frame by frame, the clip is produced in real time: a 12-second cut takes about 12 seconds, and a 60-second cut takes a minute. That is the trade for zero upload and no plugin.

Setting start and duration

Start is in seconds from the beginning of the file — 0 is the first frame, 12.5 is halfway through the thirteenth second. Duration is clamped between 1 and 60 seconds, which keeps a single pass inside what a browser tab can comfortably record.

Keep the tab visible and the machine awake while it records. A backgrounded tab gets throttled, and a laptop that sleeps mid-record produces a truncated file.

What you get, and what you lose

Output is WebM. Everywhere that matters plays it — Chrome, Firefox, Edge, Android — but Safari and iOS are unreliable, and some social platforms reject WebM uploads. If the clip has to go into an iPhone or an Instagram upload, convert it to MP4 afterwards.

Audio is included only if the source video's audio track survives the capture. A muted source produces a silent clip, which is usually what people want from a trimmed screen recording and a surprise when they expected sound.

When to use ffmpeg instead

For a precise cut at an exact frame, or for a source with variable frame rate, the ffmpeg-based tools on this site re-encode properly and are frame-accurate. They are also slower to start, because the engine is around 31 MB.

Use this recorder for a quick grab, and ffmpeg when the result has to be exact.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions