Free Video Trimmer

A video trimmer is a tool that lets you remove unwanted portions from the beginning, end, or middle of a video clip. It is the single most common video editing operation — industry data shows that roughly 90% of video editing tasks involve some form of trimming or cutting. Whether you are preparing a clip for social media, removing dead air from a screen recording, or shortening a lecture video, trimming is almost always the first step.

Our free video trimmer runs entirely in your browser using FFmpeg compiled to WebAssembly. This means your video files are never uploaded to any server — they stay on your device throughout the entire process. You get the power of professional-grade video processing software without installing anything or trusting a third party with your content.

How to Trim Videos Online

Using this tool is straightforward. Drop your video file onto the upload area or click to browse your files. The tool supports MP4, MOV, WebM, and AVI formats — covering virtually all video files you will encounter. Once loaded, you will see a full video player with a visual timeline below it.

To set your trim points, either drag the green handles on the timeline or type exact times in the start and end input fields. You can also play the video and click "Set to current" to mark the start or end at the current playback position. The clip duration updates in real-time as you adjust the handles.

Choose your trim mode and output format, then click "Trim Video." The tool processes your clip and presents a download button with the output file size. You can trim another clip from the same video or load a new file entirely.

Fast Trim vs Precise Trim

Fast Trim uses stream copying (-c copy) — the video data is not re-encoded, just repackaged. This makes it essentially instant regardless of file size, and produces output that is bit-for-bit identical to the original in quality. The only trade-off is that cut points snap to the nearest keyframe. In most modern video files, keyframes occur every 1-2 seconds, so your actual trim point may differ from your chosen point by up to that amount.

Precise Trim re-encodes the video, which allows frame-accurate cuts at the exact positions you specify. This takes longer — processing time depends on the clip length, resolution, and your device's CPU — but guarantees your trim is exactly where you want it. The output is re-compressed, so there is a slight generational quality loss, though at the default quality settings it is visually indistinguishable from the original.

For most use cases, Fast Trim is the right choice. Use Precise Trim when your cut points are mid-scene and even a one-second offset would include unwanted content — for example, trimming reaction videos, cutting specific moments from sports footage, or creating clips for short-form social media where every frame counts.

Tips for Clean Video Cuts

Short-form video under 60 seconds drives roughly 2x more engagement than longer content on platforms like TikTok, Instagram Reels, and YouTube Shorts. When trimming for social media, aim for tight clips that start immediately with the action — viewers decide within the first 1-3 seconds whether to keep watching.

For professional editing workflows, consider cutting on action — place your trim points where there is visual movement or a scene change. This makes the cut feel natural and hides any slight keyframe misalignment from Fast Trim mode. If you are trimming interview or podcast footage, cut during pauses between sentences rather than mid-word.

When preparing clips for presentations or meetings, leave a half-second buffer before and after the relevant content. This prevents the trim from cutting into important audio and gives the viewer a moment to orient before the content begins. If file size is a concern for email attachments, WebM output typically produces smaller files than MP4 at equivalent quality.