Online Video Trimmer

Continue in the tool

More pages for this tool

remove a section from the middle of a video

How to remove a section from the middle of a video

Pick Remove it, drag the handles over the unwanted part and the timeline hatches it in red. When you play, the preview skips the marked section, so you hear and see the result before cutting. On confirmation, the two ends are joined with no gap and no repeat.

What happens to the frames and audio of the removed part

Taking the middle out of a video is different from cutting the ends: what follows the section has to start where the section began. The tool decodes the video, discards the frames whose instant falls inside the section and moves the clock of every following frame back by the removed length. A frame that sat at 15 s, with the section from 10 s to 15 s removed, ends up at 10 s. The final length is the original minus the section: 60 s with 15 s removed gives 45 s.
Audio follows a similar rule, with one precaution: audio packets last around two dozen milliseconds, and a packet that straddles the section border cannot stay, or two packets would overlap at the join. So every packet that touches the section is discarded, and the ones after it are shifted the same way as the frames. At the join there can be a silent gap of a few tens of milliseconds, which in practice goes unnoticed.
Since every frame is redrawn, this mode always re-encodes the video, to MP4 (H.264) or WebM (VP9), depending on the browser. Fast cut only applies when the edit is really a simple trim: if the removed part starts at 0 or ends at the end, a single continuous piece remains and the tool treats it as an ordinary cut, allowing the copy without re-encoding again. If the selection covers the whole video, nothing is left and the tool warns you.

Checked examples

Section in the middle

Input: 60 s − [10, 25] s
Expected output: 45 s

60 s video, remove 10 s to 25 s: 60 minus 15 s removed; re-encodes.

Section touching the start

Input: 60 s − [0, 12] s
Expected output: [12, 60] s = 48 s

Removing 0 s to 12 s becomes an ordinary cut, which accepts fast mode.

Section touching the end

Input: 60 s − [40, 60] s
Expected output: [0, 40] s = 40 s

Removing 40 s to 60 s also becomes an ordinary cut.

Frame after the section

Input: [10, 15] s, t = 15 s
Expected output: t = 10 s

With 10 s to 15 s removed, the 15 s frame moves to 10 s: the clock goes back 5 s, the section length.

Audio packet on the border

Input: [10, 15] s, 9.99 s + 20 ms
Expected output: ✕

An audio packet that starts at 9.99 s and lasts 20 ms ends at 10.01 s, inside the section, and is discarded so it does not cause an overlap.

Remove everything

Input: 60 s − [0, 60] s
Expected output: ✕

Removing the whole video leaves nothing; the tool asks you to shrink the selection.

Full tool FAQ

How do I trim a video online without uploading the file?

Pick the file and mark the start and end on the timeline. The trim runs in the browser, on your device's own processor, and the result is built in memory and downloaded directly. No byte of the video goes through a server, which also means there is no upload queue and no upload limit.

What is the difference between fast cut and frame-exact cut?

Why does the fast cut start before the point I marked?

How do I remove a section from the middle of a video?

Does trimming lose quality?

Which video formats work?

Why does my browser not let me re-encode?

How do I remove the sound or rotate the video?

Is there a size or duration limit?

Does it work on a phone?

Frequently asked questions

Can I remove more than one section at once?

Each run removes one section. To take out two, build the edited file and load it again to remove the second. Work from back to front if you want to keep the times you noted, because removing the later part first does not shift what comes before it.

Does the join leave a jolt in the picture?

The picture does not, because frames are only repositioned in time. What can happen is a jump in content, since the scene before and after the section was not recorded in sequence. Choose cut points where the action is similar so the join feels natural.

Why is this mode slower than an ordinary cut?

Because every frame is decoded, repositioned and compressed again, while fast cut only copies data. The time grows with duration and resolution; the progress bar shows advancement and an estimate of what is left, and the Cancel button stops the work.

Next steps

Continue in the tool

Open full tool

remove a section from the middle of a video

How to remove a section from the middle of a video

What happens to the frames and audio of the removed part

Taking the middle out of a video is different from cutting the ends: what follows the section has to start where the section began. The tool decodes the video, discards the frames whose instant falls inside the section and moves the clock of every following frame back by the removed length. A frame that sat at 15 s, with the section from 10 s to 15 s removed, ends up at 10 s. The final length is the original minus the section: 60 s with 15 s removed gives 45 s.

Audio follows a similar rule, with one precaution: audio packets last around two dozen milliseconds, and a packet that straddles the section border cannot stay, or two packets would overlap at the join. So every packet that touches the section is discarded, and the ones after it are shifted the same way as the frames. At the join there can be a silent gap of a few tens of milliseconds, which in practice goes unnoticed.

Since every frame is redrawn, this mode always re-encodes the video, to MP4 (H.264) or WebM (VP9), depending on the browser. Fast cut only applies when the edit is really a simple trim: if the removed part starts at 0 or ends at the end, a single continuous piece remains and the tool treats it as an ordinary cut, allowing the copy without re-encoding again. If the selection covers the whole video, nothing is left and the tool warns you.

Checked examples

Section in the middle

Input: 60 s − [10, 25] s
Expected output: 45 s

60 s video, remove 10 s to 25 s: 60 minus 15 s removed; re-encodes.

Section touching the start

Input: 60 s − [0, 12] s
Expected output: [12, 60] s = 48 s

Removing 0 s to 12 s becomes an ordinary cut, which accepts fast mode.

Section touching the end

Input: 60 s − [40, 60] s
Expected output: [0, 40] s = 40 s

Removing 40 s to 60 s also becomes an ordinary cut.

Frame after the section

Input: [10, 15] s, t = 15 s
Expected output: t = 10 s

With 10 s to 15 s removed, the 15 s frame moves to 10 s: the clock goes back 5 s, the section length.

Audio packet on the border

Input: [10, 15] s, 9.99 s + 20 ms
Expected output: ✕

An audio packet that starts at 9.99 s and lasts 20 ms ends at 10.01 s, inside the section, and is discarded so it does not cause an overlap.

Remove everything

Input: 60 s − [0, 60] s
Expected output: ✕

Removing the whole video leaves nothing; the tool asks you to shrink the selection.

Full tool FAQ

How do I trim a video online without uploading the file?

What is the difference between fast cut and frame-exact cut?

Why does the fast cut start before the point I marked?

How do I remove a section from the middle of a video?

Does trimming lose quality?

Which video formats work?

Why does my browser not let me re-encode?

How do I remove the sound or rotate the video?

Is there a size or duration limit?

Does it work on a phone?

Frequently asked questions