UtilityKit

500+ fast, free tools. Most run in your browser only; Image & PDF tools upload files to the backend when you run them.

PDF Resize Page Size

Change PDF page size to A4, US Letter, US Legal, A3, or custom dimensions. Rescales content to fit, in the browser.

About PDF Resize Page Size

PDF Resize Page Size standardises the paper size of every page in a PDF to a target like A4, US Letter, US Legal, A3, A5, Tabloid, or any custom width/height in PDF points. This is the tool you reach for when a colleague sends you a US Letter draft and your printer is set to A4, when a legal-size contract needs to fit a standard A4 archive, or when you are merging documents created on different continents and want every page sized identically. Three fit modes give you control over how the original page content sits on the new paper: Contain preserves the aspect ratio with white space, Cover fills the page edge-to-edge and may crop, and Stretch fills exactly with mild distortion. The tool works entirely in your browser using pdf-lib — your file never gets uploaded — and content stays as native vectors, so text remains selectable and images keep their resolution.

Why use PDF Resize Page Size

Browser-Only

Files never leave your device — pdf-lib runs locally, useful for confidential or compliance-restricted documents.

Standard Sizes Built In

A4, US Letter, US Legal, A3, A5, Tabloid, and Executive sizes are pre-configured in PDF points.

Custom Dimensions

Set any width and height for unusual formats like booklet pages, business cards, or board game inserts.

Three Fit Modes

Contain, Cover, and Stretch let you balance fidelity, fill, and white-space exactly the way you need.

Preserves Vector Content

Native page embedding means text stays searchable and images keep full resolution — no rasterisation.

Mixed-Source Merging

Standardise pages from different paper sizes before merging so the output looks uniform.

How to use PDF Resize Page Size

  1. Drop your PDF onto the upload area or click to browse.
  2. Pick a target paper size from the dropdown — A4, US Letter, US Legal, A3, A5, Tabloid, Executive, or Custom.
  3. If you chose Custom, enter the width and height in PDF points (1 inch = 72 points).
  4. Choose orientation: Auto keeps each page's existing direction, or force Portrait/Landscape across the document.
  5. Pick fit mode: Contain (white space, no distortion), Stretch (fill exactly), or Cover (fill, may crop edges).
  6. Click 'Resize pages' and download the resized PDF — every page now matches your target size.

When to use PDF Resize Page Size

  • When converting a US Letter document to A4 (or vice versa) so it prints correctly on local paper.
  • When merging a Legal-size contract with A4 supporting documents into a single uniform PDF.
  • When shrinking an A3 spread down to A4 to fit a standard binder.
  • When standardising pages exported from Word, Google Docs, and InDesign to one common size.
  • When preparing a PDF for an e-reader that expects a specific aspect ratio.
  • When uploading to a portal that rejects mixed page sizes within a single PDF.

Examples

US Letter to A4

Input: draft.pdf — 5 pages at 612 × 792 pt

Output: draft-resized.pdf — 5 pages at 595 × 842 pt, content fitted with no distortion

Mixed sizes to uniform A4

Input: merged.pdf — 8 pages, mixed Letter and Legal

Output: merged-resized.pdf — 8 pages all at 595 × 842 pt, ready to bind

A3 spread to A4

Input: spread.pdf — 1 page at 842 × 1191 pt

Output: spread-resized.pdf — 1 page at 595 × 842 pt, content scaled to fit

Tips

  • Use Contain mode for documents with text — Stretch can warp characters subtly and Cover risks chopping marginal content.
  • If your source has both portrait and landscape pages, leave Orientation on Auto to keep each page's natural direction.
  • PDF points to mm: divide by 2.835. So A4 (595 × 842 pt) = 210 × 297 mm.
  • After resizing, run PDF Compress to shrink the file size — embedded pages can balloon byte size slightly.
  • Cover mode is ideal for slide deck PDFs where you want every slide to fill the new paper without bands.

Frequently Asked Questions

Does this re-render text or just rescale?▾
It embeds each source page as a native PDF object inside the new sized page, then scales the embedded object. Text stays as native text, not raster, so search and copy keep working.
Will the file size grow?▾
Slightly, because pdf-lib re-saves the document with a new wrapper structure. For real shrinkage, run the output through PDF Compress.
What happens to my page numbers and headers?▾
They scale with the page content. If headers were positioned with a margin, they retain that proportional margin in the resized page.
Can I have different sizes per page?▾
No — this tool applies one target size uniformly. For mixed-size output, run multiple passes on different page ranges.
Does it preserve hyperlinks?▾
Annotations and hyperlinks are preserved as part of the embedded page object. Their click areas scale with the page.
What's the difference between Cover and Contain?▾
Contain fits the source inside the target leaving white space; Cover fills the target completely and may crop overflowing content; Stretch fills exactly but may distort the aspect ratio.
Can I resize encrypted PDFs?▾
Encrypted PDFs need to be unlocked first via the PDF Unlock tool. Once decrypted, this resizer treats them like any other file.
Maximum number of pages?▾
Limited only by browser memory. Documents with several hundred pages process fine on a modern laptop with 4 GB+ free memory.

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Glossary

A4
International ISO 216 paper size, 210 × 297 mm or 595 × 842 PDF points; the default in most of the world.
US Letter
North American paper size, 8.5 × 11 inches or 612 × 792 PDF points; default in the United States and Canada.
US Legal
North American paper size, 8.5 × 14 inches or 612 × 1008 PDF points; common for contracts.
PDF Point
Measurement unit used by PDFs: 1 point = 1/72 inch, so 72 points equal one inch.
Contain Fit
Sizes the source page to fit inside the new page while preserving aspect ratio; may leave white space.
Cover Fit
Sizes the source page to fully fill the new page while preserving ratio; may crop edges that overflow.