A4 vs. Letter — Why It Matters
A4 (210 × 297 mm) is the standard paper size used in Europe, Asia, and most of the world. US Letter (8.5 × 11 inches, or 216 × 279 mm) is the standard in North America. A4 is slightly narrower and taller. When a document formatted for one size is printed on the other, the margins shift — text may be clipped, or large white borders appear. This is the most common reason people need to change PDF page size.
Scale Content vs. Resize Canvas
There are two approaches to changing page size. Scaling content re-renders the entire page proportionally to fit the new dimensions — content fills the page, but text and images are scaled up or down. Resizing the canvas changes the declared page dimensions without moving the content — useful if you just need to declare a different size for print settings without changing the visual layout. Our tool supports both methods.
- Choose 'Scale content' when printing a document formatted for a different paper size
- Choose 'Resize canvas only' when you need to change the declared page size for technical reasons without altering the layout
- A4 to Letter scaling factor is approximately 97.4% — barely noticeable
Supported Page Sizes
The tool supports all common ISO paper sizes (A3, A4, A5, B4, B5) and North American sizes (Letter, Legal, Tabloid/Ledger). Custom dimensions (in mm or inches) can also be entered manually.
Step-by-Step: Change PDF Page Size
1. Open the Page Size tool and upload your PDF. 2. Select the target size from the dropdown (A4, Letter, Legal, etc.) or enter custom dimensions. 3. Choose whether to scale content or resize the canvas only. 4. Select page range (all pages or specific pages). 5. Click Convert and download the result.