Free online tool

Trim MP4 Without Re-encoding

Trim an MP4 locally in your browser with stream copy, preserving the original quality and keeping the video on your device. Choose a video to get started.

Choose a video in the interactive tool

JavaScript is required for video processing

Common video formatsUp to 500 MB on desktopNo sign-upNo upload

About this tool

How trim mp4 without re-encoding works

Process

Choose an MP4, set the start and end times, and trim it with stream copy. Compatible video and audio streams are copied rather than re-encoded.

Result

A shorter MP4 that preserves the original encoded video and audio quality.

Good to know

Lossless trimming follows nearby keyframes, so the first frame can differ slightly from the exact start time you requested.

Is the MP4 uploaded?

No. Trimming runs locally in your browser and the selected MP4 is never sent to Soulnio.

Does trimming reduce quality?

No. Compatible streams are copied directly without a full video re-encode.

Why can the start time shift slightly?

Compressed video can begin cleanly only at keyframes when stream-copy trimming is used.