Why are the fast-mode parts not exactly the length I set?

Video is compressed in groups that start at keyframes, so without re-encoding a part can only begin on a keyframe. Each cut therefore moves to the first keyframe after the split point — usually 0–2 seconds later, more for videos with sparse keyframes. The page lists every part's actual start and end when it finishes. Use Precise (re-encode) when cuts must land on an exact second.

How accurate is splitting by size?

The tool computes the average bitrate as file size ÷ duration, derives how long each part should be, and keeps about 5% headroom. Because scene complexity varies and fast mode moves cuts to keyframes, a part can still come out slightly larger, so set the target a little below your platform's limit.

Does splitting reduce quality?

Fast mode simply separates the original data, so quality is identical to the source. Precise mode re-encodes to H.264 at CRF 20, which is visually near-identical but takes longer.

Is my video uploaded? Is it free?

Nothing is uploaded — everything runs in your browser with FFmpeg (WebAssembly) and is discarded when you close the page. The tool is free, with no sign-up and no watermark.

🪚

🪚Video Splitter Online - Split Video into Equal Parts

Split a long video into smaller clips. Choose N equal parts; every X seconds (for example 60-second parts for Stories or short-video length limits); a target size per part in MB, where the length of each part is estimated from the video's average bitrate — handy for email, cloud-drive or messaging-app size limits; or custom time points, typed in or added while you watch with “Split at current time” on the timeline, where clicking a red marker removes it. The timeline shows each part in alternating colors and a table lists every part's start, end, length and estimated size. Fast mode copies the audio and video data without re-encoding, finishing in seconds with no quality loss, but it can only cut on keyframes, so each cut moves to the next keyframe. Precise mode re-encodes each part to H.264 MP4 with frame-accurate cuts. When it finishes you see each part's actual start, end, length and file size, and can download parts individually or all together as a ZIP.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

Loading tool...

How to use Video Splitter

1Upload a video
2Choose how to split: N equal parts, fixed length, size per part, or custom markers on the timeline
3Choose Fast or Precise mode, click Split video, check the part lengths and download the ZIP

FAQ

Why are the fast-mode parts not exactly the length I set?: Video is compressed in groups that start at keyframes, so without re-encoding a part can only begin on a keyframe. Each cut therefore moves to the first keyframe after the split point — usually 0–2 seconds later, more for videos with sparse keyframes. The page lists every part's actual start and end when it finishes. Use Precise (re-encode) when cuts must land on an exact second.
How accurate is splitting by size?: The tool computes the average bitrate as file size ÷ duration, derives how long each part should be, and keeps about 5% headroom. Because scene complexity varies and fast mode moves cuts to keyframes, a part can still come out slightly larger, so set the target a little below your platform's limit.
Does splitting reduce quality?: Fast mode simply separates the original data, so quality is identical to the source. Precise mode re-encodes to H.264 at CRF 20, which is visually near-identical but takes longer.
Is my video uploaded? Is it free?: Nothing is uploaded — everything runs in your browser with FFmpeg (WebAssembly) and is discarded when you close the page. The tool is free, with no sign-up and no watermark.