VIDEO TRIMMING TOOL

视频无损切片工具

设置起止时间,在浏览器中无损切片MP4、WebM和MOV视频。纯本地运行,数据不上传,保护隐私。

Start Trimming
🔒 100% Client-side · Files never leave your browser · Max 500MB
📹

Drag & drop a video file here, or click to browse

Supports MP4, WebM, MOV · Max 500MB

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📖 Video Lossless Trimmer Guide

What is Video Lossless Trimming?

Video trimming removes unwanted sections from the beginning and end of a video while keeping the middle segment intact. Our tool processes everything inside your browser using HTML5 Canvas and MediaRecorder APIs, ensuring your original video quality is preserved and your files never leave your device.

Supported Formats

How to Use

1. Drag and drop or click to select your video file. 2. Use the timeline handles or type exact start/end times. 3. Click "Trim Video" to process. 4. Download your sliced video when ready. The entire process runs client-side for maximum privacy.

Pro Tips

常见问题

Is this video trimmer truly lossless?

Our tool uses frame-level Canvas rendering with MediaRecorder to export video at high quality. While browser-based encoding uses lossy codecs (VP9/Opus), the temporal slicing is frame-accurate, meaning no frames are dropped or duplicated at cut points. For true lossless byte-level cutting, server-side tools like FFmpeg are required.

Do my video files get uploaded to a server?

No. This is a 100% client-side tool. Your video file is read using the browser's FileReader API and processed locally with Canvas and MediaRecorder. Nothing is ever uploaded, transmitted, or stored on any server.

支持哪些浏览器?

Chrome, Edge, Firefox, and Safari (14+) are supported. Chrome and Edge offer the best MediaRecorder compatibility and encoding speed. Safari users may see slightly larger output files due to codec differences.

Why is the output in WebM format?

Browsers natively support MediaRecorder for WebM containers with VP8/VP9 video and Opus audio. MP4 recording via MediaRecorder is still experimental in most browsers. WebM provides excellent quality and is compatible with most modern video players and editing software.

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