Free PDF Page Numbers Tool – Add Page Numbers to PDF Online

Add Page Numbers to PDF – Free & Instant

Upload any PDF, choose your preferred position, font size, and style, then download the numbered version in seconds. No sign-up required.

What Is the PDF Page Numbers Tool?

The PDF Page Numbers Tool is a free, browser-based utility that lets you add page numbers to any PDF document without installing software or uploading your file to a remote server. All processing happens directly inside your browser using the open-source pdf-lib library, which means your documents remain completely private.

Whether you are preparing a thesis, a legal brief, a business report, or a creative portfolio, neatly numbered pages make your document easier to navigate, reference, and present. This tool gives you full control over where the numbers appear, how they look, and whether they follow a custom prefix or suffix format.

Key Features

6 Position Options – Place numbers at the top-left, top-center, top-right, bottom-left, bottom-center, or bottom-right of every page.
Custom Font Size – Choose any size from 6 pt to 72 pt to match your document's typography.
Color Picker – Match the page number color to your brand or document theme.
Start Number Control – Begin numbering from any page (e.g., start from page 3 if your first two pages are cover sheets).
Custom Prefix & Suffix – Format numbers as "Page 1 of N", "-1-", "§ 1", or any other style.
Margin Control – Fine-tune the distance from the page edge so numbers never overlap your content.
Live Preview – See a visual representation of where the number will be placed before you process the file.
100% Private – Your PDF is never sent to any server. Everything runs locally in your browser.

Who Is This Tool For?

This tool is ideal for students submitting academic papers, lawyers and paralegals preparing filings, executives creating board decks, authors formatting manuscripts, and anyone who needs a quick, reliable way to paginate a PDF without spending money on Adobe Acrobat or similar software.

How to Use the Tool – Step by Step

Step 1 – Upload: Click the upload area or drag and drop your PDF file. The file is loaded entirely in your browser's memory.
Step 2 – Configure: Choose the position, font size, color, starting number, margin, and optional prefix/suffix text.
Step 3 – Preview: Review the thumbnail previews to confirm the number placement looks correct.
Step 4 – Apply & Download: Click "Add Page Numbers" and download your fully paginated PDF instantly.

1 Upload Your PDF

Click to browse or drag & drop your PDF here

Supported format: PDF only · Processed entirely in your browser

2 Configure Page Numbers

Position

Font Size (pt)

Color

Start Number

Margin (px)

Prefix

Suffix

3 Preview Placement

Upload a PDF to see preview thumbnails.

4 Apply & Download

Frequently Asked Questions

Is this tool completely free to use?

Yes, the PDF Page Numbers Tool is 100% free with no hidden fees, no subscriptions, and no sign-up required. You can use it as many times as you need.

Is my PDF uploaded to a server?

No. Your PDF file never leaves your device. All processing is done entirely inside your web browser using client-side JavaScript. This means your documents remain fully private and secure.

Can I start the page numbering from a specific page?

Yes. The "Start Number" option lets you set whatever number you want the first page to show. For example, if your document has a cover page and a table of contents that you don't want counted, you can skip them by entering 3 as the start number.

Can I add a prefix like "Page 1 of 10"?

You can freely add a prefix (e.g., "Page ") or a suffix. Note that automatically displaying the total page count (e.g., "of 10") requires a second pass; for now, you can manually enter the total in the suffix field if you know it.

What PDF file size limit is supported?

Because processing happens in your browser, the limit depends on your device's available memory. In practice, PDFs up to several hundred megabytes work without issues on modern computers. Very large PDFs (500MB+) may be slow on low-memory devices.

Will page numbers be added to every page including the cover?

By default, page numbers are added to all pages. If you want to skip the first one or two pages (e.g., a cover or a blank page), you can adjust the start number value so that the numbering still appears but begins where you intend.

Does this tool work on mobile phones and tablets?

Yes. The tool is fully responsive and works on any modern browser including those on iOS and Android devices. Processing speed may be slower on lower-end devices for large files.

Which browsers are supported?

The tool works on all modern browsers: Google Chrome, Mozilla Firefox, Microsoft Edge, Apple Safari, and Opera. Internet Explorer is not supported.

Can I change the font of the page numbers?

Currently the tool uses the built-in Helvetica font via pdf-lib, which provides clean and professional results across all PDF viewers. Custom font support is planned for a future update.

Will the original PDF content be affected?

No. The tool only adds a new text layer on top of your existing PDF content. It does not modify, compress, or alter any of the original text, images, or other elements in your document.

How the Tool Works Technically

This tool is powered by pdf-lib, a pure JavaScript library for creating and modifying PDF documents. When you upload your PDF, it is read into your browser's memory as an ArrayBuffer. The library then parses the PDF structure, iterates over each page, calculates the correct X/Y coordinates based on your chosen position and margin, and draws the page number text using the standard Helvetica font.

Once all pages have been processed, the modified document is serialized back into a binary PDF and presented to you as a download link using a Blob URL. The entire process — from parsing to rendering to download — happens without any network request. Your file is never transmitted anywhere.

Why Client-Side Processing Matters

Many online PDF tools send your files to remote servers for processing. This raises valid privacy concerns, especially for sensitive documents like contracts, financial reports, medical records, or academic submissions. By running entirely in the browser, this tool eliminates that risk entirely. The file exists only in your browser's memory and is discarded when you close or refresh the page.

Tips for Best Results

Use a small font size (9–12 pt) for professional documents to keep numbers subtle.
Choose "Bottom Center" for academic papers and "Bottom Right" for legal or business documents.
Increase the margin if your PDF has a tight border or decorative frame near the edge.
Dark gray (#333333) is a good neutral color that works on both white and off-white backgrounds.
If numbering a large document, be patient — the progress bar will indicate status during processing.