PDF & Image Tools
Split Large PDF by File Size
Break a large PDF into smaller files under a chosen MB cap. Ideal for email attachments and upload portals.
100% Local Processing - Files Never Leave Your Browser
Your files are processed directly on your device. No upload to server storage, no remote document copy, and no account required.
- Processed locally in your browser
- Never uploaded to server storage
- Designed for sensitive files (financial, legal, medical)
Split PDF files directly in your browser. No PDF upload to the server is performed.
Input limit for local processing: 25 MB.
Split mode
Tip: use ~20 MB when a service allows 25 MB email attachments.
About
How it helps
A document can fail upload even when its content is correct, simply because it is too large. This route is for that exact problem: choose a maximum file size and split the PDF into chunks that stay under the cap when possible. It is the practical path for email delivery and strict portal limits.
- Set the cap slightly below the official limit to allow for transport overhead.
- Chunking is page-aware: pages stay intact and are grouped into the smallest possible number of parts.
- If one page alone exceeds the cap, the tool exports it separately and flags it clearly.
Primary use
Email and upload size limits
Sizing method
Measured serialized PDF chunk size
Processing mode
Local browser processing
FAQ
Frequently Asked Questions
+Should I choose 20 MB or 25 MB for email?
Use around 20 MB when the mailbox says 25 MB to leave room for transfer overhead.
+What happens if one page is already larger than the target size?
That page cannot be split further and is exported as an oversize part so you can handle it separately.
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