Can I change the font size?

Yes. You can adjust the font size to match your document's body text (usually 10pt or 12pt).

Will this cover existing footers?

The tool draws *over* existing content. If your document already has page numbers, we recommend using a PDF Editor to cover or remove them first, or simply place the new numbers in a different position.

Does it work on password-protected PDFs?

No. You must **Unlock the PDF** first using a password removal tool before we can modify it, as the file content is encrypted.

Yes. All processing happens in your browser using **PDF-lib**. Documents are never uploaded to our servers.

Agregar Números de Página a PDF - Herramienta de Manipuladores en Línea Gratis

How Agregar Números de Página a PDF Works

Implementation & Processing Pipeline

Page numbering adds text overlays to each page of a PDF at consistent positions. The numbers are drawn directly onto the page content, becoming a permanent part of the document.

This tool uses PDF-lib for browser-based PDF manipulation. The process involves:

Parsing: The PDF structure is loaded into memory (without uploading to a server).
Font Embedding: A standard font (e.g., Helvetica) is embedded if not already present.
Canvas Drawing: For each page, the tool calculates the specific x,y coordinates based on the page size (A4, Letter, etc.) and selected position (e.g., Bottom Center).
Serialization: The modified document is saved as a new binary blob.

How It's Tested

We validate the numbering logic against various PDF standards to ensure professional output.

The "Position Accuracy" Check:
- Action: Add numbers to "Bottom Center" on a mixed-orientation PDF (some pages Portrait, some Landscape).
- Expected: The tool must correctly calculate the center for each page individually, not just apply a global offset.
The "Start Sequence" Test:
- Action: Set "Start Number" to 5.
- Expected: Page 1 of the document is labeled "5", Page 2 is "6", etc.
The "Content Overlap" Verification:
- Action: Number a page with full-bleed images.
- Expected: The text is drawn on top of the image layer (Z-index check), remaining visible.
The "Large Document" Performance:
- Action: Number a 500-page legal document.
- Expected: The tool must complete the operation in under 3 seconds in a standard browser.

The History of PDF Pagination

Portable Document Format (PDF), created by Adobe in 1993, is page-independent. Unlike Word docs which "reflow", PDF pages are static canvases. Adding a page number isn't just "typing text footer"; it implies modifying the drawing instructions for every single page object. This tool abstracts that complexity using modern JavaScript libraries.

Common Number Formats

Format	Example
Plain	1, 2, 3
With prefix	Page 1, Page 2
With suffix	-1-, -2-
Roman	i, ii, iii
Roman uppercase	I, II, III
Letters	a, b, c

Margin Considerations

Page numbers are placed within the printable area. Ensure sufficient margins if printing.

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