Splitting a Large Video Into Smaller Parts
The video itself is fine — it is just too long to send or upload. Splitting is not compression: it cuts the file into standalone playable parts with continuous content, and they reassemble into the original.
Split or compress?
Two different problems. If the recipient merely finds the file big, compress it — quality stays, data shrinks. If a hard limit blocks you — an attachment cap, a duration cap, or a transfer that dies midway — splitting is the reliable route: every part is under the limit and can be sent one by one.
The rule of thumb: when the limit is size and quality loss is acceptable, compress; when the limit is size or duration and the content must stay intact, split. You can also combine both — compress first, then split into smaller parts.
By duration or by part count
The tool offers two modes. By duration: set N seconds per part, with the last part being the natural remainder — best for aligning with a per-file cap. By part count: set N parts and the tool divides evenly — best when you just want roughly a few pieces without computing seconds.
Sizing math: get total duration and total size from file properties, estimate per-second size, then set part length just under the limit with about ten percent of headroom. For part-count mode, divide total size by the number of parts and verify each stays within the limit.
Managing parts afterwards
Parts carry sequential names; recipients play them in order. If you later want one file back, merge the parts in sequence with the video merge tool — parts cut from the same source share encoding specs, so merging adds no extra loss.
One caveat: the content around each cut point is not lost, but every part is re-packaged as an independent file. If further editing follows, keep the number of processing rounds low (see generational loss).