Add Page Numbers to PDF

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Local Device Tool (Zero Data Upload)

Automatically insert sequential page numbers onto every page of your PDF document.

Key Capabilities

Six position options

Bottom-left, bottom-center, bottom-right, top-left, top-center, or top-right.

Font size and margin control

Adjust font size from 8 to 16pt and set the margin to match your document's layout.

Start from any number

Useful when a chapter or section needs to continue the numbering from a previous document rather than starting at 1.

How to Use

Upload your PDF

Any standard document.

Choose position, starting number, and font size

Preview updates as you adjust each setting.

Download

Page numbers are added to every page.

Common Use Cases

Numbering a thesis chapterAdding sequential page numbers before printing.
Starting a legal brief at page 5Because the first four pages are cover material that shouldn't be numbered from 1.

Frequently Asked Questions

Can I choose where the page numbers appear?

Yes. You have full control over the placement of the page numbers. You can position them at the bottom center, top right, or any custom margin to avoid overlapping your document's text.

Is my document uploaded to a server?

No. The page numbers are added locally in your browser. Your files never leave your device, ensuring maximum privacy for your documents.

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PDF Editing and Manipulation — A Complete Guide

How PDF Files Work Internally

A PDF file is more than a simple document — it is a complex container format that can hold text, fonts, images, vector graphics, form fields, digital signatures, and even JavaScript. The PDF specification (ISO 32000) defines how all these elements are stored and rendered. When you open a PDF, the viewer software reads a cross-reference table that maps every object in the file to its byte offset, allowing instant access to any page without reading the entire file. Understanding this structure helps explain why some PDF operations (like reordering pages) are fast while others (like compressing embedded images) require processing every page.

Merging, Splitting, and Reordering Pages

DoctorDocs uses the pdf-lib JavaScript library for all PDF manipulation operations. pdf-lib can parse existing PDFs, extract individual pages, combine pages from multiple documents, and create new PDFs — all without a server. When you merge two PDFs, pdf-lib copies the page objects from both source files into a new PDF container, preserving fonts, images, and formatting. When you split a PDF, it extracts the specified pages into a new, standalone document. The reorder tool lets you drag pages into a new sequence and saves the result as a fresh PDF with pages in your chosen order.

PDF Compression Explained

PDF file size is primarily driven by embedded images. A single high-resolution photograph can add 5-15MB to a PDF. Our compression tool works by re-encoding embedded images at a lower quality setting while preserving text and vector elements at full quality. This typically reduces file size by 40-80% with minimal visible quality loss. The tool is especially effective on PDFs created by scanners (which embed full-resolution page images) and presentation exports (which often contain unoptimized photographs). Text-only PDFs are already compact and may not see significant size reduction.

Digital Signatures and Form Filling

Adding a signature to a PDF involves overlaying your signature image or drawing at a specific position on a specific page. DoctorDocs supports three signature methods: drawing with your mouse or touchscreen, typing your name and selecting a handwriting-style font, or uploading an image of your physical signature. For form filling, we parse the PDF's interactive form fields (AcroForm or XFA) and generate a clean web form that is easier to fill out than the original PDF. Your responses are then written back into the PDF form fields, producing a properly filled document that can be read by any PDF viewer.