Split PDF by File Size — Fit Any Upload Limit
Automatically split a large PDF into parts under a size limit you set (e.g. 5 MB each) for email and portals. Free.
🔒 Files are processed on your device — nothing is ever uploaded to a server
Upload portals with hard size limits are everywhere. Set your limit and the tool cuts the document into sequential parts that each fit under it.
How it works
- Open the large PDF.
- Enter the maximum size per part (e.g. 8 MB).
- Download the numbered parts.
Why MyPDF
- Truly private — Everything runs inside your browser. Your files are never uploaded, stored, or seen by anyone — unlike most online PDF sites.
- Free with no sign-up — No account, no daily limits on core tools, no watermarks added to your files.
- Fast — No upload/download round-trip to a server. Large files start processing instantly.
- Works everywhere — Any modern browser on Windows, Mac, Linux, Android, or iPhone. Installable as an app (PWA).
FAQ
Can the receiver rejoin the parts?
Yes — our free Merge tool puts them back together in order.
Is it safe for confidential documents?
Yes. Processing happens locally in your browser (client-side). You can even disconnect from the internet after the page loads and most tools keep working.