A PDF page resizer converts documents between standard paper sizes like A4 (210 × 297 mm) and US Letter (8.5 × 11 in). Useful when sharing files across regions or printing documents designed for a different paper size.
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Page Size Settings
How to Resize PDF Pages
PDF page size issues are common when sharing documents internationally. A report formatted for US Letter (8.5 × 11 in) prints with white bands when sent to an A4 printer, and vice versa. This PDF page resizer converts between all standard sizes without re-encoding content — text stays selectable and vector graphics stay crisp.
Step 1: Upload Your PDF
Click "Browse File" or drag your PDF onto the upload area. The tool reads the first page dimensions and displays them above the settings so you can confirm the current size before converting.
Step 2: Choose Target Size and Scale Mode
Select the target paper size from the dropdown. A4 (595 × 842 points), US Letter (612 × 792 points), US Legal (612 × 1008 points), and A3 (842 × 1191 points) are available. You can also enter custom dimensions in millimeters.
The scale mode controls how the existing content is handled: Scale content to fit resizes page content to fill the new dimensions proportionally — the safest option for most cases. Keep content size, change margins moves only the page boundary without touching content — useful when the content is the right size but the document margins need adjusting. Scale proportionally scales content while strictly maintaining the aspect ratio, which may leave empty space on one side.
Step 3: Resize and Download
Click "Resize & Download". The tool uses pdf-lib to rewrite each page's MediaBox and content transform. All pages in the document are resized to the same target dimensions. The file is downloaded automatically when complete.
A4 vs Letter: Key Differences
A4 is 8.27 × 11.69 inches — slightly taller and narrower than US Letter (8.5 × 11 inches). When printing an A4 document on Letter paper, the left and right margins appear narrower, and the bottom may clip. Converting to Letter before printing avoids these issues. The difference is small enough that converting either direction rarely causes text reflow problems.
FAQ
Is this PDF resizer free?
Yes — completely free with no account or signup required. All processing happens in your browser.
Is my PDF data private?
Yes. Your files never leave your device. All resizing happens locally in your browser using pdf-lib. Nothing is sent to any server.
What is the difference between A4 and Letter size?
A4 is the standard paper size used in most of the world (210 × 297 mm, or 595 × 842 points). US Letter is the American standard (8.5 × 11 inches, or 612 × 792 points). A4 is slightly taller and narrower than Letter.
What does 'Scale content to fit' do?
This mode scales the page content proportionally so it fits within the new page dimensions while maintaining the original aspect ratio. Use this when you want all content visible with no clipping.
What does 'Keep content size, change margins' do?
This mode only changes the page boundary (MediaBox) without moving any content. The content stays the same size — the margins simply grow or shrink. Use this to add whitespace or trim borders.
Can I use a custom page size?
Yes — select 'Custom' from the target size dropdown and enter width and height values in millimeters. The tool converts them to PDF points (1 mm = 2.835 pts) automatically.
Will text remain selectable after resizing?
Yes — pdf-lib modifies page geometry but does not re-render or rasterize content. Text, vector graphics, and hyperlinks remain fully intact and selectable in the output.