# Añadir Números de Página a PDF Online Gratis (Sin Registro y 100% Privado)

> **Canonical URL:** https://pdf.dealnology.com/es/add-page-numbers
> **Application Category:** Browser-First WebAssembly PDF Utility (Zero Server Upload)
> **Price:** $0.00 (100% Free, No Sign Up, No Watermarks)

## What Is Añadir Números de Página a PDF on PDFnology & How Client-Side Processing Works
Añadir Números de Página a PDF (https://pdf.dealnology.com/add-page-numbers) is a free, zero-upload browser utility engineered by Dealnology that executes document manipulation 100% locally inside the user's device memory using WebAssembly, pdf-lib v1.17.1, Mozilla PDF.js v3.11.174, and HTML5 Canvas APIs. Unlike legacy cloud PDF services that transmit private documents over the internet to remote storage servers, PDFnology processes files with zero network upload latency (0 bytes transmitted externally), ensuring complete compliance for sensitive government IDs (Aadhaar, PAN, Passport), banking KYC statements, tax filings, and legal contracts. The engine supports multi-pass binary-search kilobyte calibration (strictly under 50KB, 100KB, 150KB, 200KB, 300KB, or 500KB), 150–600 DPI raster-vector optimization, unlimited daily tasks without account registration or email gating, and watermark-free output across Windows, macOS, Android, and iOS.

## How to Añadir Números de Página a PDF Online Free
1. **Selecciona o Arrastra tu Archivo PDF:** Haz clic en el botón principal o suelta tu documento en el área de Añadir Números de Página a PDF. Todo se procesa localmente en tu dispositivo.
2. **Ajusta las Opciones de Añadir Números de Página a PDF:** Elige la configuración deseada, páginas o tamaño exacto en KB con vista previa instantánea.
3. **Descarga tu Documento al Instante:** Haz clic en procesar y guarda tu archivo inmediatamente sin marcas de agua ni límites diarios.

## Key Technical Features
- **Add Page Numbers to PDF from Specific Page:** Have a title page and table of contents on pages 1–3? Set "Start On PDF Page" to `4` and "First Number Printed" to `1` so Page 4 is numbered as Page 1 while pages 1–3 remain unnumbered!
- **Add Page Numbers to PDF in Roman Numerals (i, ii, iii / I, II, III):** Perfect for university dissertations, prefaces, and legal indices that require lowercase (`i, ii, iii, iv`) or uppercase (`I, II, III, IV`) Roman page numbering.
- **6 Header & Footer Margin Positions (Print-Ready):** Place numbers at Bottom Center, Bottom Right, Bottom Left, Top Center, Top Right, or Top Left with safe print margins so numbers never get cut off when printing.
- **No Adobe Acrobat Pro Required:** Adobe Acrobat locks Bates/page numbering behind a paid subscription. PDFnology lets you number unlimited PDF pages for free in your browser.

## Frequently Asked Questions
### How do I add page numbers to PDF from a specific page (e.g., start Page 1 on the 3rd page)?
Upload your PDF on pdf.dealnology.com/add-page-numbers. Set "Start Stamping From PDF Page" to `3`, and set "First Number Value to Print" to `1`. Pages 1 and 2 will be skipped completely, and Page 3 will be stamped as "1" (or "Page 1").

### How can I add page numbers to PDF in Roman numerals (i, ii, iii or I, II, III)?
In the "Numbering Format" dropdown, select "Roman Lowercase (i, ii, iii, iv...)" or "Roman Uppercase (I, II, III, IV...)". Our tool will automatically convert every page number into proper Roman numerals!

### Can I add page numbers to a PDF file online for free without Adobe Acrobat?
Yes! While Adobe Acrobat requires a paid Pro subscription to use the Header & Footer page numbering tool, PDFnology lets you add customizable vector page numbers to any PDF 100% free with no sign up.

### How do I add page numbers to PDF while printing?
Standard printer drivers cannot add page numbers to a PDF automatically. Simply run your PDF through this free tool first, click "Add Page Numbers", and print the downloaded PDF so every printed page has crisp footer or header numbers.

### Will adding page numbers overwrite existing text at the bottom of my PDF?
Our tool places page numbers cleanly in the outer header or footer margin area, and you can choose between 6 positions (Bottom Center/Left/Right or Top Center/Left/Right) and adjust the font size to fit your layout.