PDF Splitter

PDF files are often large multipage documents that need to be divided for practical reasons. You might need to extract just the signature page from a contract, separate individual invoices from a combined statement, or split a 200-page report into chapters for easier distribution. Email attachment size limits (typically 10-25 MB) also frequently require splitting large PDFs before sending. Manually taking screenshots or printing specific pages loses quality and creates image files instead of proper PDFs with searchable text.

Server-based PDF tools like iLovePDF and Smallpdf require you to upload your entire document to their servers. This is a privacy concern for confidential documents -- once uploaded, you have no control over how long the file is stored, who can access it, or whether it's used for training AI models. Client-side tools like ours process the PDF entirely in your browser using the pdf-lib JavaScript library, which parses and manipulates the PDF structure without any network communication.

A PDF file is structured as a hierarchy of objects: a catalog at the root, containing page tree nodes, which contain individual page objects. Each page object references content streams (the drawing commands), fonts, images, and other resources. When splitting a PDF, the tool creates a new PDF document and copies the selected page objects (and their referenced resources) into it. This preserves the original formatting, fonts, images, and interactive elements.

The pdf-lib library handles this process in the browser. It reads the PDF's binary data, parses the object structure, and creates a new PDF with only the selected pages. For large PDFs (100+ pages), this can take a few seconds and use significant memory, but modern browsers handle it well. The output is a valid PDF that can be opened in any PDF reader. Note that encrypted PDFs require a password to decrypt before splitting -- our tool supports this via pdf-lib's encryption handling.