Resize PDF Pages to Any Standard Size Convert PDF pages to different standard paper sizes.

What Is PDF Page Size Converter?

The PDF Page Size Converter changes the page dimensions of your PDF to any standard paper size. Auto-detects the current page size and lets you convert to A3, A4, A5, Letter, Legal, or Tabloid. Content is proportionally scaled to fit the new page size while maintaining aspect ratio, centered on each page. Perfect for adapting documents between international (A-series) and US paper sizes, or preparing files for different printers. All conversion happens in your browser.

Why Use PDF Page Size Converter?

• Auto-detects current page size
• Six standard target sizes available
• Content scaled proportionally with centering
• Handles multi-page documents

Common Use Cases

International Print

Convert between A4 and Letter for different regions.

Poster Scaling

Scale A4 content to A3 or Tabloid.

Booklet Prep

Convert to A5 for booklet printing.

Printer Compatibility

Match page size to available printer paper.

Technical Guide

Uses pdf-lib embedPages to embed source pages into new documents with target dimensions. Each page is embedded and scaled using Math.min(targetW/sourceW, targetH/sourceH) to maintain aspect ratio while fitting the target size. Content is centered with calculated x/y offsets. Supports six standard sizes defined as point dimensions. Auto-detection compares page dimensions against known sizes with 5pt tolerance. Output pages maintain all content quality.

Tips & Best Practices

• 1
  Content is scaled proportionally — no distortion
• 2
  A4 to Letter is the most common conversion
• 3
  Check margins after conversion
• 4
  Large to small conversions may reduce text readability

Related Tools

PDF Resize

Resize PDF pages.

📄 PDF Tools

PDF Crop Pages

Crop PDF pages.

📄 PDF Tools

PDF Rotate All

Rotate all pages.

📄 PDF Tools

PDF Margin Adjuster

Add or adjust margins on PDF pages.

📄 PDF Tools

Frequently Asked Questions

Q Does content get distorted?

No, content is proportionally scaled maintaining the original aspect ratio.

Q What sizes are supported?

A3, A4, A5, US Letter, US Legal, and Tabloid.

Q Is content centered on the new page?

Yes, content is centered both horizontally and vertically.

Q Does it handle mixed-size PDFs?

Yes, each page is individually converted to the target size.

Q Is text quality preserved?

Yes, content is embedded as vector data preserving quality.

About This Tool

PDF Page Size Converter is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.