What's the difference between the two cut styles?

Lossless copies the original streams, so it finishes in seconds and the quality is untouched — but the cut lands on the nearest keyframe before your start point. Frame-exact re-encodes, which is slower but starts precisely where you asked.

Is there a file size limit?

No hard limit, but the engine holds the video in memory — stay under about 1 GB on desktop and 300 MB on mobile browsers.

Does the video get uploaded?

No — trimming happens entirely in this tab.

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