ALLYX ONE
100% browser-based · zero uploads

Video Trimmer

Trim any video online for free — no sign-up, no uploads, nothing to install. Set your start and end points, cut your clip, and download it in seconds. Everything happens right in your browser, so your video never leaves your device.

Drop your video here, or click to choose a file

MP4, WebM, MOV — up to 500 MB

How It Works

This free online video trimmer processes your video entirely in your browser — no upload is ever sent to a server.

  1. 1. Choose your video

    Click the upload area or drag and drop any MP4, WebM, or MOV file. It loads instantly into an HTML5 Video element — nothing leaves your computer.

  2. 2. Set your start and end points

    Drag the Start time and End time sliders to define exactly which portion you want to keep. The clip summary shows your selected duration in real time. Precision is 0.1 seconds.

  3. 3. Trim in your browser

    Click Trim Video. On Chrome and Edge, the WebCodecs API fast-forwards through the video at 16×, re-encodes only the selected frames using hardware-accelerated H.264, and muxes them into a new MP4 — all on your device. Audio is decoded via the Web Audio API, sliced to match the trim range, and re-encoded with AAC. On Safari and Firefox, the MediaRecorder API records from the Canvas element and Web Audio stream in real time.

  4. 4. Download your clip

    The trimmed video is available immediately. Click Download Trimmed Video and it saves straight to your device — no server round-trip ever occurs.

Your video stays on your device

Unlike cloud-based video editors, this tool never transmits your video to a server. All encoding and trimming happens inside your browser tab using native browser APIs — the WebCodecs API for fast hardware-accelerated encoding on modern browsers, and the MediaRecorder API as a fallback on Safari and Firefox. You can verify this by watching your network tab in DevTools — you'll see zero outbound video requests.

Frequently Asked Questions

Is my video uploaded to a server?
No. All trimming happens locally in your browser using the WebCodecs API and MediaRecorder API. Your video files never leave your device — nothing is transmitted to a server.
What video formats can I trim?
The tool supports MP4, WebM, and MOV files up to 500 MB. MP4 (H.264) offers the best cross-browser support.
Will the audio track be preserved?
Yes. The audio is decoded, sliced to match your trim range, and re-encoded into the output file. On Chrome and Edge this uses the WebCodecs AudioEncoder API (AAC). On Safari and Firefox the Web Audio API and MediaRecorder handle audio capture.
What format does the trimmed video download as?
On Chrome and Edge you get an MP4 file (H.264 + AAC) — compatible with virtually every device. On Firefox the output is WebM. Both play without any additional software.
Is this video trimmer really free?
Yes, completely free — no account, no watermarks, no hidden fees. Because processing runs on your own device, there are no server costs to pass on.