Split PDF by Size
OrganizeBreak a large PDF into smaller files that each fit under your chosen size limit — ideal for email attachment caps and upload limits.
How to use Split PDF by Size
- Open this page in any modern web browser — no download or installation required.
- Click Add file or drag and drop your PDF onto the drop zone.
- Adjust the available settings to fit your needs.
- Click the action button and save the processed file — the result is ready instantly.
Files never leave your browser. No upload to any server.
Processing runs locally on your device. No queues, no waiting.
No signup, no watermarks, no limits. Use as many times as you like.
Why use Split PDF by Size on PDF Modern?
PDF Modern’s split pdf by size tool processes your file entirely within your web browser using modern WebAssembly technology. Unlike traditional online PDF services that require uploading your documents to remote servers, your files never leave your device — ensuring complete privacy and security. Processing happens at the full speed of your CPU, not limited by upload or download bandwidth, so even large files are handled in seconds. There are no file-size restrictions, no daily usage caps, no watermarks on output, and no account creation needed. It is a fully free, open tool built for everyday document workflows at home, school or the office.
Frequently asked questions
How accurate is the size limit?
Pages are added one at a time and a new file starts whenever the next page would exceed the limit. Single oversized pages will produce a single oversize file.
How do I get all the parts?
Each part downloads automatically as it's ready. Use "Download all" to re-trigger any you missed.