Split by Size
Divide large PDF documents into smaller chunks under a target MB file size.
Tailored Parameters
Fine-tune exact dimensions, qualities, ranges, or security tokens for this feature.
Instant Local Processing
Zero latency local computation directly in your browser session.
Same-Page Workflow
Re-run operations repeatedly without losing your active tool workspace.
When a system refuses anything over a fixed megabyte limit, the practical question is not where the chapters end but how much fits. This tool fills a document with pages until the next one would push it past your target, then starts a new part.
Parts come back as a ZIP, numbered in order, so the sequence is easy to reassemble or upload one at a time.
How it works
- 1Load the oversized PDF. Large scanned documents are the usual candidates.
- 2Set the size ceiling. Give the maximum megabytes each part may reach — match the limit the receiving system enforces.
- 3Download the parts. A ZIP arrives containing the numbered parts.
When you need it
- Meeting an email attachment ceiling without a file transfer service
- Uploading to a portal that rejects files above a fixed size
- Breaking a large scan into pieces that survive a slow connection
Frequently asked questions
- What if one page alone exceeds the limit?
- That page becomes a part of its own. Compress PDF first if it still needs to be smaller.
- Are pages ever cut in half?
- No. Splitting always happens on a page boundary.
- Can I make the parts smaller than the limit?
- Set a lower target. Sizes are approximate because PDF structures are shared across pages.
- Are my documents uploaded anywhere?
- No. Every tool in PDF41 runs inside your browser tab using WebAssembly and JavaScript. Your file is read from disk into memory, processed locally, and handed back as a download. It is never transmitted to a server, so there is nothing to intercept, retain, or delete afterwards.
- Does this work without an internet connection?
- Yes, once the page has loaded. The PDF engine, fonts and character maps are all served from this site rather than a third-party CDN, so an unstable connection or a locked-down corporate network does not stop the tool from working.
Similar tools to use
Complete your document workflow with these frequently paired tools.
Compress PDF
Reduce file size while preserving high visual quality and typography.
Split PDF
Split specific page ranges or extract each page into a separate document.
Merge PDF
Combine multiple PDF files and images into a single cohesive document.