Trim a video
Keep the part you want and drop the rest. The clip is copied, not re-encoded, so it holds exactly the picture and sound that were in the original. Nothing is uploaded.
Nothing is uploaded. Open your browser’s Network tab while you trim — you will see the file go nowhere.
Why the start may move by a second
Video is not stored as a sequence of complete pictures. Every so often there is a keyframe — a full picture — and the frames after it store only what changed. A clip that began anywhere else would open by describing changes to a picture it does not contain.
So the start snaps back to the nearest keyframe, and this page tells you exactly how far it moved. Most trimmers avoid the snap by re-encoding the whole clip, which costs quality every time you trim. Moving the cut by a second and saying so is the better trade.
What happens to the location tag
An iPhone writes the coordinates of the spot you were standing into the
video file, under com.apple.quicktime.location.ISO6709, alongside
the phone’s model and the moment you pressed record. Most people have no
idea it is in there, and every video they post carries it.
The clip this writes does not carry any of it across. A new container is written
from scratch around the compressed picture, and the QuickTime metadata is simply
not copied into it — not the coordinates in the old ©xyz
atom, not the newer Apple keys, not the original recording time. We checked this
rather than assumed it: the automated test builds a file carrying a location in
both formats, runs it through this tool, and then looks for the coordinates twice
— once with a proper parser and once by searching the raw bytes of the
result, because a leak that hides from one can still be found by the other.
Being exact about the limits: the finished file does carry the time you converted it, because the writer stamps one. That says when you used this page, which you already know; it does not say where you were or what recorded it. And this is about metadata, not about the picture — if a street sign is visible in the frame, no tool can help with that.
Common questions
Does trimming reduce the quality?
No. The compressed video and audio are copied across unchanged. The finished clip is re-opened and checked, and what it actually contains is listed with the result.
Why is it so fast?
Because nothing is decoded or re-encoded. Trimming is a copy, so it is limited by how fast the file can be read.
Can I cut out the middle instead?
Not yet — this keeps one continuous stretch. To get several pieces, use split a video into parts.
Does my video get uploaded?
No. All of the work happens in this page, and the privacy page explains how the browser is prevented from sending it anywhere.
All 39 HermitFile tools
Every one of them runs in your browser. Nothing you open is uploaded, and nothing is stored.