Question 1

What time format should I use?

Accepted Answer

Enter times as seconds ("90"), minutes:seconds ("1:30"), or hours:minutes:seconds ("1:02:03") — all three formats work in the start/end fields.

Question 2

Why does my trimmed video start a second or two off from where I set it?

Accepted Answer

This tool uses fast "stream copy" trimming (no re-encoding), which snaps cut points to the nearest keyframe rather than being frame-exact. This keeps trimming fast even for long videos, at the cost of small precision near the cut point.

Question 3

Does trimming re-encode or reduce video quality?

Accepted Answer

No — stream copy trimming copies the original video data as-is with no re-encoding, so there's no quality loss.

Question 4

Why does the first use take longer than expected?

Accepted Answer

The first time you use any audio/video tool on this site, your browser downloads a ~30MB video-processing engine (ffmpeg compiled to WebAssembly), cached afterward for instant use across all audio/video tools.

Question 5

Is my video uploaded to a server?

Accepted Answer

No. Trimming happens entirely in your browser using WebAssembly — your video never leaves your device.

Video Trimmer

Choose Video & Trim Range

Result

Frequently Asked Questions

What time format should I use?

Why does my trimmed video start a second or two off from where I set it?

Does trimming re-encode or reduce video quality?

Why does the first use take longer than expected?

Is my video uploaded to a server?

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