Split PDF by File Size – Free Online PDF Splitter

Step by step

Split a PDF by Size: step by step

Split a large PDF into smaller files that stay under a size limit, ideal for email uploads. Free online, no watermark.

1. 1

   Upload your PDF

   Drop the document in — it shows as the selected file with a Remove button beside it, and the options appear underneath. Files are deleted after 2 hours.

2. 2

   Set the size & the names

   Max size per file (KB) is the whole game: our 4.5 KB test with a 2 KB limit came out as four parts. The File name pattern labels every part — [BASENAME]-[PART] by default — and Discard bookmarks drops the outline if you like.

   
3. 3

   Split & download

   Press Split by size and the parts arrive together as a ZIP — wm-demo-1.pdf through wm-demo-4.pdf in our run, each one page and under the limit, with the page count kept across the whole set.

   

• A size you name

  Set the maximum in kilobytes; the splitter packs as few parts as possible.

• One ZIP back

  All the parts arrive together, named and numbered.

• Pattern names

  [BASENAME]-[PART] and friends label every part exactly as you like.

• Bookmarks optional

  Keep the document's outline, or discard it with the toggle.

• Parts stay PDFs

  Every part is a standard PDF with its pages unharmed.

• Private by default

  No account, no watermark — and every file is automatically deleted after 2 hours.