When a portal only accepts files up to 5 MB, or your email limit is 20 MB, you need parts of a known size — not a guessed number of pages. Enter the maximum size and we measure the real file size of each part as we build it, adding as many pages as fit. Pages stay in their original order, and all parts download together in one ZIP.
Tips for the best result
- Try compressing first — you may not need to split at all.
- A single page bigger than the limit gets a file of its own; compress that part afterwards.
- Name or number the parts when you upload them so the reader knows the order.
How to split PDF by size
- Select or drop the PDF you want to split.
- Choose how to split: by page ranges, every page, or every N pages.
- For ranges, type them like 1-3, 4-6, 7.
- Click Split PDF and download your files (several files come in one ZIP).
Want more options? The full Split PDF tool has every setting.
Frequently asked questions
How do I split a PDF into files under 10 MB?
Open your PDF here — 'By file size' is already selected with 10 MB. Change the number if you need a different limit, then click Split PDF.
Will the parts be exactly the size I enter?
Each part will be at or under your limit; the exact size depends on where the page breaks fall.
Does splitting reduce quality?
No. Pages are copied as they are. Only the way they're grouped into files changes.
How do I split a PDF into separate pages?
Add your PDF, choose "Every page" and click Split PDF. You'll get one PDF per page, packed in a ZIP file you can open on any computer or phone.
Step-by-step guide: How to split a PDF into multiple files
Read the guide