Split by Size: Set the Limit the Portal Checks
Splitting by size answers the limit that actually stopped the upload. The work is in translating the quoted number into the field and accepting that equal-size parts mean unequal page counts.
Why this comes up
Portals, mail gateways and client systems enforce their own ceilings, and they quote them in the unit their interface prefers. A PDF's pages vary in weight, so a page-count split can still produce a part that is over the limit.
Check before you run it
- Translate the limit into kilobytes. The field takes KB per file. A limit quoted as 10 MB is roughly ten thousand KB, and leaving a little room below the ceiling is safer than landing exactly on it.
- Compress first if one page cannot fit. A very small ceiling may be smaller than a single scanned page. Reduce the images, then split the lighter file into parts that can meet the limit.
- Expect parts with different page counts. The splitter packs as many pages as fit, so a text-heavy part may hold more pages than an image-heavy one. Judge the result by the size ceiling, not by equal page counts.
When to reach for it
- A tender portal caps each attachment. The cap is per file, so splitting into the fewest compliant parts is quicker than guessing a page range.
- A print shop asks for files below a fixed size. Split the artwork at the shop's ceiling and label the parts in reading order before sending.
One question we get
How does splitting by size work?
Set the maximum KB per part and the tool packs as many pages as fit under it into each PDF — the handiest fix for upload limits on other websites.
Where it fits
The tools people usually open next to Split by size:
- Rotate PDF — Rotate and save PDF pages permanently.
- Delete Pages — Remove pages from a PDF document.
- Split by text — Split when specific text changes from page to page.
Every tool works on a copy, so the original file is never touched. Uploads are stored under an unguessable id and deleted automatically two hours after you last open them; nothing is listed, shared or indexed. More on the security page.