About the Resize PDF Tool
This tool changes the paper size of a PDF — A4 to US Letter, Letter to A4, anything to A5 or Legal — and can scale the content down to add printable margins. Each original page is embedded as vector content into a fresh page of the target size and drawn scaled-to-fit, so text and line art stay perfectly sharp: nothing is rasterized. Use it when a US-formatted document needs to print on A4 paper (or vice versa) without clipped edges, when a form needs uniform margins for binding, or when mixed page sizes in one document need normalizing. Everything runs in your browser; the file is never uploaded.
How to Resize PDF Pages
- Drop in your PDF — the current page size is detected automatically.
- Pick the target size — A4, US Letter, Legal, A5, A3, or Tabloid.
- Choose orientation and fit — Auto keeps each page's own orientation; Fit preserves proportions, Stretch fills the page exactly.
- Optionally scale the content — 90% leaves an even margin all round.
- Download — the resized PDF keeps selectable text and crisp vectors.
A4 vs US Letter — why this matters
A4 (210 × 297 mm) is slightly narrower and taller than US Letter (216 × 279 mm). A document laid out for one and printed on the other either gets scaled awkwardly by the printer driver or clipped at the edges — the classic symptom is a US form whose bottom line vanishes on A4 paper. Converting the PDF itself to the target size, with content scaled to fit, removes the guesswork from the print dialog entirely. To shrink the file's byte size rather than its page dimensions, use the PDF Compressor instead.
The 6-millimeter problem
A4 is 210 × 297 mm; US Letter is 216 × 279 mm. Letter is 6 mm wider and 18 mm shorter. That small mismatch is responsible for a remarkable amount of print frustration: a Letter-formatted US form printed on A4 loses its bottom line or gets shrunk by the driver, while an A4 document on Letter paper clips at the sides or floats with uneven margins. Neither paper “wins” — A4 (ISO 216) is the standard almost everywhere, Letter rules in the US and Canada — so documents that cross the Atlantic keep hitting the mismatch.
Resizing the PDF converts the geometry once, correctly: each page is embedded as vector content into the target size and scaled to fit, so a 100% print on the destination paper comes out exactly as intended. Because A4 and Letter are proportionally close (aspect ratios 1.414 vs 1.294), the fit adds only slim bars — far better than a clipped line.
Vector embedding is what keeps it sharp
This tool never rasterizes. The source page becomes an embedded form object — the PDF-native way to nest one page inside another — and is drawn scaled onto the new page. Text remains real text to the renderer, curves remain curves, and a page scaled to 50% is as crisp at 400% zoom as the original. That’s also why the operation is fast and the file size barely changes: the fonts and images are carried over, not re-encoded. The one thing resizing deliberately doesn’t touch is byte size — for that, pair it with the PDF Compressor. And if what you actually want is to cut away page edges rather than scale content, that’s a different operation: Crop PDF.
