Video Editor & Trimmer — Cut Video Online
Trim and cut MP4, WebM, MOV and more right in your browser. Pick the exact start and end, then download just that portion — or mute, extract audio, make a GIF, resize, change speed and convert. Nothing is uploaded.
The first action loads a one-time ~25 MB video engine. Trimming is fast and lossless; effects like resize, speed and GIF re-encode and can be slow on long clips — best for clips up to a few hundred MB.
About the Video Editor & Trimmer — Cut Video Online
The AlarmDaddy Video Editor is a free online video editor and video cutter that trims video, extracts the exact portion you want, and downloads it — without uploading anything. Load an MP4, WebM, MOV, MKV or AVI, watch it in the built-in player, set a precise start and end, and trim. It is the quick way to cut a clip, make a highlight, grab a few seconds for social media, or pull one scene out of a long recording.
It is powered by ffmpeg.wasm, a WebAssembly build of FFmpeg that runs inside your browser. That means your video never leaves your device — no upload, no sign-up, no watermark — and it works on a laptop or a phone. The first action loads a one-time video engine (about 25 MB); after that, editing is instant to start.
Trim to the exact second. Use the player to find the moment, then set the start and end times (down to fractions of a second) with the sliders, the number boxes, or the "from frame" buttons that grab the current playback position. Press Trim selection and you get a new video of just that range. Trimming uses stream copy by default — it is fast and lossless (no quality drop). Need the cut to land exactly on a chosen frame? Switch on frame-accurate mode and it re-encodes precisely.
A real toolkit, not just a cutter. From the same selection you can remove the audio, extract the audio as an MP3, turn the clip into an animated GIF (with adjustable fps and width), resize to 480/720/1080, change speed from 0.5× to 2×, rotate 90/180/270°, or convert between MP4 (H.264) and WebM. Each result shows a preview and a one-click download.
Private and on-device. Because everything is processed locally, this is a safe video trimmer for personal clips, screen recordings and anything confidential. Trimming is fast; effects that re-encode (resize, speed, GIF, convert) are heavier and are best on shorter clips — the tool shows a progress bar while it works.
Reach for this when you need to cut a video online, trim an MP4, make a GIF from a video, extract audio from a video, or shrink a clip — all without installing software or sending your footage to a server.
How to use this tool
- 1Choose a video or drag it onto the page (MP4, WebM, MOV, MKV, AVI…).
- 2Play it, then set the start and end with the sliders, the second boxes, or the "from frame" buttons.
- 3Press "Trim selection" — leave frame-accurate off for a fast lossless cut, or turn it on for an exact frame.
- 4Or run another action on that range: remove audio, extract MP3, make a GIF, resize, change speed, rotate, convert.
- 5Wait for the progress bar (the first run loads the ~25 MB engine), then preview and download the result.
The formula
FFmpeg is the same engine most desktop video tools use; ffmpeg.wasm compiles it to run in the browser. A "stream copy" trim doesn't decode and re-encode the frames — it copies the compressed data between the nearest keyframes, which is why it's fast and lossless (the cut may begin at the closest keyframe). "Frame-accurate" trimming and every transform decode the frames, apply the change (scale, speed via PTS/atempo, rotation, GIF palette, a different codec) and re-encode — accurate but slower, and the speed depends on your device because it all runs locally.