Split PDF by File Size Online Free
Automatically slice large PDF documents into smaller chunks under 5MB, 10MB, or 20MB for email attachments and portal upload limits. 100% private in-browser.
Drop your oversized PDF here to split by size cap
Lossless document chunking · 100% client-side
Processed locally in your browser. Never uploaded.
Automated Document Chunking for Email Gateways and Upload Ceilings
How size-based page extraction ensures attachments pass server filters
Email service providers like Gmail, Microsoft Outlook, and corporate Exchange servers enforce hard rejection limits on file attachments—usually 20 MB or 25 MB. Government portals, court filing systems, and university admissions databases are even stricter, frequently rejecting any document over 5 MB or 10 MB.
Manually guessing which page ranges will fall beneath an arbitrary megabyte threshold requires tedious trial-and-error. Modifyle solves this through intelligent client-side document chunking.
Our engine analyzes the internal PDF object catalog page by page, automatically assembling coherent subsets that stay strictly under your selected size threshold. Everything is processed directly inside your browser memory with zero cloud uploads.
How It Works in 3 Simple Steps
Upload Large PDF
Drop your multi-page document into the size splitter.
Select Size Ceiling
Choose 5MB, 10MB, 20MB, or type an exact custom megabyte limit.
Download Sliced Parts
Save individual segments or grab all files at once as a single ZIP archive.
Why choose Modifyle PDF Size Splitter?
Launch PDF, image, and QR tools in 1 click right from your home screen or dock. 100% private, client-side, with instant offline access.