PDF Splitter by Size
Split large PDFs into smaller files by exact MB or KB limit (e.g., 10MB, 25MB). Perfect for email attachments and court portal uploads.
Select your file here to get started
or drop your file here.
What to expect
Experience fast, secure, and completely private processing directly inside your web browser.
Intelligent Page Boundary Detection
The tool uses galloping binary search algorithms to find the exact page count that fits your size limit without exceeding it, even accounting for PDF structural overhead.
100% Private & Local Processing
Your PDF never leaves your browser. All splitting happens in your device's memory using WebAssembly, ensuring sensitive documents remain completely confidential.
Smart Size Warnings
If your target size is too small (under 4 KB) or individual pages exceed your limit, the tool warns you upfront and explains why splitting may not be possible.
One-Click ZIP Packaging
All split parts are automatically bundled into a single ZIP file, preventing your browser from triggering multiple download notifications for each part.
How it works
Simply upload your content, adjust your settings, and download the result instantly.
Upload PDF File
Select or drag and drop your large PDF document into the browser. The tool instantly analyzes the file structure and page count.
Set Target Size
Choose your maximum size per part in KB or MB (e.g., 10 MB for email, 2 MB for portals). The tool calculates optimal page boundaries automatically.
Download ZIP Archive
Click split to process locally. All parts are bundled into a single ZIP file for convenient download, avoiding browser download spam.
Frequently Asked Questions
Get quick answers about supported formats, data privacy, and using this tool.
About This Tool
Email servers reject attachments over 25MB, and many court or government portals cap uploads at 10MB. Traditional PDF splitters force you to guess which page numbers equal 10MB. Our tool does the math for you: it intelligently splits your PDF at clean page boundaries, guaranteeing no single part exceeds your chosen file size limit. Unlike server-based splitters that upload your sensitive documents to remote queues, our tool runs entirely in your browser using advanced PDF parsing algorithms. Your confidential tax returns, legal contracts, and medical records never leave your device, ensuring absolute privacy and instant processing without upload delays. Set precise targets in kilobytes or megabytes, from tiny 100 KB chunks for legacy systems to large 50 MB segments for high-capacity portals. The tool automatically handles structural overhead and warns you when individual pages exceed your limit, making it perfect for email attachments, court filings, university submissions, and cloud storage optimization.
