Question 1

What is the difference between fast and accurate trimming?

Accepted Answer

Fast mode copies the video stream without re-encoding, so it finishes in seconds and loses no quality; its cuts land on the nearest keyframe, which can shift your start by a second or so. Accurate mode re-encodes the section, so the cut is exact to the frame you asked for, at the cost of more processing time. Use fast for rough extracts and sharing, accurate when the first frame matters, like a reaction moment or a product reveal.

Question 2

How do I state the part I want?

Accepted Answer

Give the start in seconds (or minutes:seconds like 1:30) and either the end point or the length. The preview of the source helps you find the moment: play the video, note the counter where your section begins and ends, and enter those. Decimals are welcome in accurate mode, for example 12.5 to 18.25, when you are chasing a single gesture.

Question 3

Does trimming reduce quality?

Accepted Answer

In fast mode, not at all: the frames are copied bit-for-bit. In accurate mode the section is encoded once at a high-quality setting, which on normal content is visually indistinguishable from the source. Either way your original file is untouched, and because the work happens in your browser, the untrimmed footage never leaves your device.

Question 4

Can I trim a very long video?

Accepted Answer

Yes, with the fast mode being the kind route for long recordings since it barely processes the picture at all. A two-hour lecture trims in moments. Accurate mode on a long output section means a long encode, so trim long material in fast mode first and, if the edges need polish, re-trim the short extract accurately.

Question 5

What formats can I trim?

Accepted Answer

MP4, MOV, MKV, WebM, AVI and the other formats FFmpeg reads, which is effectively everything phones and cameras produce. Fast mode keeps the source format; accurate mode exports MP4, the most compatible choice. If a file uses an exotic codec, the tool reports it plainly rather than emitting a broken clip.

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Fast or accurate

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