Split PDF by Size

Your portal caps uploads at 2 MB? Cut the PDF into parts that are guaranteed to fit — no more guessing how many pages make 2 MB.

Privacy Level 1 — 100% local: your files never leave your browser

Free plan: one PDF up to 100 MB per run. Need more? Split PDF by Size Pro adds batch splitting.

Drop your PDF here

or click to browse · split locally, never uploaded

Size limit per part

Each part at most

Keep a 5% safety margin Pack against 95% of your limit, so a portal that counts KB differently can never push a part over the line.

How it works: the tool measures every page, packs as many pages as fit under your limit, then checks each part's real file size before showing it. If one page alone is bigger than your limit, it tells you plainly — splitting cannot fix that; compress the PDF first.

Something not working?

Tell us what went wrong — it helps us fix the tool. Only what you type below is sent; your files never leave your device.

Need more power? Meet Split PDF by Size Pro

One-time payment. Yours forever. No subscription.

$29

single payment · lifetime updates included

Feature	Free	Pro
PDFs per run	1 file	Unlimited batch
File size	Up to 100 MB	Unlimited
Guaranteed size limit per part	Yes	Yes
5% safety margin	Yes	Yes
Saved portal presets	—	Yes
Split + compress in one pass	—	Yes
Ads	Shown on page	Ad-free
Updates	—	Lifetime free updates

Get Pro — $29 one-time

Frequently asked questions

Is my PDF uploaded to your servers?

No. Your PDF is split entirely inside your browser using the open-source pdf-lib engine. The engine's library file loads from a public CDN, but your PDF itself never leaves your device.

How is this different from splitting by page numbers?

Page-count splitting makes you guess: ten pages of scanned images can be 8 MB while ten pages of text are 200 KB. Here you type the limit — say 2 MB — and the tool packs pages until each part is verified under it, so the portal accepts every file first time.

What if one page alone is bigger than my limit?

Then no split can help — a single page cannot be cut in half. The tool will tell you which page it is. Compress the PDF first (try our PDF Compressor), then split again.

What limits do portals usually set?

Visa and government portals commonly cap uploads at 1–2 MB, court filing systems at 5 MB, and Gmail attachments at 25 MB. The exact limit is printed next to the upload box on your form.