PDF Page Resizer
Resize PDF pages to A4, Letter, A3 or a custom scale so every page prints consistently. Free, no signup, works in your browser.
Everything runs inside your browser — your file is never uploaded to a server.
About this tool
This tool changes the physical page size of a PDF, converting between A4 (210x297mm), US Letter (216x279mm), A3 and other formats, or scaling content by a custom percentage. Feed it a scanned contract mixing Letter and A4 pages and normalize everything to a single A4 size before printing, or shrink oversized A3 architectural drawings down to A4 for a compact binder. You choose the target size and whether content should be scaled to fit, centered, or cropped, and pdf-lib rebuilds the page geometry directly in your browser without ever uploading the file. This matters for anyone who receives documents from different countries or software that default to different page standards, since inconsistent page sizes cause misaligned printing, awkward scanning and messy binders.
How to use this tool
1. Choose your PDF
Select or drag in the PDF file whose pages you want to resize.
2. Pick the target size
Choose A4, Letter, A3 or a custom scale percentage.
3. Apply the resize
Confirm scaling and centering options and process the pages.
4. Download the result
Save the resized PDF with consistent page dimensions.
Why use this tool
Mixed page sizes cause real headaches: printers crop content unexpectedly, scanners produce inconsistent stacks, and binders look uneven. This tool normalizes every page to the same standard size in one pass, so documents assembled from multiple sources print cleanly and look professional without opening desktop publishing software.
Tips & best practices
- Convert to A4 before printing in countries that use A4 as the standard paper size, and to Letter for the US and Canada.
- Use a custom scale under 100% when shrinking A3 drawings down to A4 to keep all details visible.
- Check margins after resizing scanned documents, since original content may sit closer to one edge.
Common use cases
- Normalizing a contract that mixes Letter and A4 pages before printing.
- Shrinking A3 architectural drawings to A4 for a compact binder.
- Resizing scanned pages from an old book to a modern standard size.
- Preparing a PDF for a printer that only accepts a single page format.
- Enlarging small note pages to a full A4 size for easier reading.
Frequently asked questions
What's the difference between A4 and Letter size?
A4 measures 210x297mm while US Letter measures 216x279mm; A4 is taller and narrower, so content near the edges may shift slightly when converting between them.
Will resizing distort my page content?
Content is scaled proportionally to fit the new page size, so text and images keep their aspect ratio, though margins may change.
Can I resize only some pages in a document?
Yes, you can apply the new size to the whole document or select a specific page range to resize.
Does resizing reduce the file size?
Not directly, since resizing changes page dimensions rather than compressing images, though smaller pages can sometimes result in a slightly smaller file.
Can I scale pages down without changing the paper size?
Yes, you can apply a percentage scale to shrink or enlarge content while keeping the same page dimensions.
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