How to Resize a PDF Online for Free: Change Page Size to A4 or Letter
Need to change PDF page size (e.g. A4 to Letter)? This guide shows you how to resize a PDF online for free—choose a standard size or custom dimensions, scale content to fit, then download. All processing runs in your browser. We cover resize pdf, change pdf page size, and the difference between resizing and compressing. No sign-up, no watermarks.
At a glance
Files stay on your device
Standard and custom
Processed in your browser
No sign-up, no watermarks
Why Use Our Free Resize PDF?
Adjust Page Dimensions Instantly
Need to print an A4 document on Letter paper, or make a scanned PDF a standard size? Our Resize PDF tool changes the physical page dimensions (e.g. A4, Letter, custom). Content is scaled to fit. This is not compression (file size)—it is page size (inches/mm). Processing runs in your browser.
Resize pdf and change pdf page size online for free.
Premium Features, Zero Cost
We offer the same powerful engines as paid software, but completely free and directly in your browser.
Standard Sizes
A4, A3, Letter, Legal, and more.
Content Scaling
Fit or Fill so content fits the new size.
Custom Dimensions
Enter exact width and height if needed.
How It Works Under the Hood
Resize vs Compress
Resizing changes the page dimensions (e.g. A4 to Letter). Compression reduces file size (MB). Your file is processed on your device—resize pdf and change pdf page size stay private.
How to Use Resize PDF in 3 Simple Steps
1. Upload Your PDF
Open the Resize PDF tool and add your file. If it is password-protected, unlock it first with our Unlock PDF tool.
2. Choose New Page Size
Pick a standard size (A4, Letter, A3, Legal) or enter custom width and height. Choose "Fit" to keep aspect ratio (recommended) or "Fill" to stretch. Content is scaled to the new page size.
To trim margins without changing overall size, use our Crop PDF tool. To reduce file size (MB), use Compress PDF.
3. Download Your Resized PDF
Download the resized PDF. To protect or compress it, use our Protect PDF or Compress PDF tools.
Who Is This Tool For?
Printing
Convert A4 to Letter (or vice versa) for your region's paper.
Publishing
Resize to meet binding or submission size requirements.
Troubleshooting Common Issues
Content looks stretched.
Use "Fit" instead of "Fill" to keep aspect ratio. Fit may leave margins; Fill fills the page but can distort.
People Also Ask
How do I change PDF to A4 size?
Use MyPocketPDF Resize PDF. Upload your file, select A4, and download.
Learn more →Is resize the same as compress?
No. Resize changes page dimensions (e.g. A4/Letter). Compress reduces file size (MB).
Learn more →Common Mistakes to Avoid
✕ Confusing resize with compress
Solution: Resize = page dimensions (A4, Letter). Compress = smaller file size. Use Compress PDF for file size.