How to Resize PDF Pages Online Free — Change to A4, Letter & Custom Sizes

Need to change the page size of a PDF document? Whether you're submitting to a portal that requires A4, printing on Letter paper, or formatting for a specific device, resizing PDF pages is quick and easy with free online tools.

When to Resize PDF Pages

• Submission requirements — Many institutions require specific page sizes (e.g., A4 for European universities)
• Printing — Match your document to the paper size you're using
• Standardization — Make all pages in a document the same size
• Digital publishing — Prepare documents for e-readers or tablets

How to Resize a PDF Online Free

Using PDFTools Resize PDF tool:

1. Go to the Resize PDF page
2. Upload your PDF file
3. Choose a preset size (A4, Letter, Legal, etc.) or enter custom dimensions
4. Click "Resize" and your updated PDF downloads automatically

Standard Page Sizes

• A4 — 210 × 297 mm (most common worldwide)
• Letter — 8.5 × 11 inches (US and Canada)
• Legal — 8.5 × 14 inches (US legal documents)
• A3 — 297 × 420 mm (large format)

Try the free online PDF resizer now.

If your PDF has uneven margins or excess whitespace, read our guide on how to crop PDF margins to clean up your document.