Split a PDF to a maximum file size

Automatically splits a large PDF into multiple parts that each stay under a chosen size limit, for example 5 MB for email attachments. Pages always stay intact. Free, local in your browser.

Choose your PDF

Drop here or click to choose

Files stay on your device — nothing is uploaded

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Your file is processed in your browser and never uploaded.

How does it work?

1
Choose your PDF
Drag the PDF here.
2
Choose the max size
Set how large each part may be at most, e.g. 5 MB.
3
Download
Download all parts in one ZIP file.

Frequently asked questions

Can a page be split across two parts?

No. Pages always stay intact — a part may be slightly smaller than the limit to prevent this.

Are my files uploaded?

No. Everything happens in your own browser. Your file never leaves your device and is not stored anywhere.

Is it free?

Yes, completely free, without watermark or account. The site is paid for by ads.

Why in the browser?

PDFrust runs entirely in your browser using WebAssembly and modern JavaScript libraries such as pdf-lib and PDF.js. Your file is never sent to a server — all processing happens locally on your device. This means your documents remain private by design, regardless of what they contain. There is no account required, no file size limit, and nothing is stored after you close the tab.