A4 and US Letter look similar but aren’t the same size, and PDFs built for one don’t always print cleanly on the other — content can end up cropped, or a print shop’s software might reject a file that isn’t a standard size at all. Resizing fixes this before it becomes a print-time problem.
Resizing to a standard size
Resize PDF scales every page to fit a target paper size:
- Upload your PDF.
- Pick A4, Letter, or Legal.
- Preview how pages will scale and center.
- Download the resized result.
Nothing gets stretched or cropped
Pages are scaled proportionally to fit the new size, then centered — content keeps its original aspect ratio rather than being stretched out of shape. If the original page’s proportions don’t exactly match the target size, you may see a bit of extra margin on one side, which is expected and preferable to distorting the content to fill the page exactly.
The scaling also isn’t a re-render to an image. Each page is redrawn as the same vector content at a new scale, so text stays text and stays sharp — you’re not trading resolution for a different page size the way you would if the tool rasterized pages first.
Why A4 and Letter don’t line up
A4 and Letter aren’t a rounding difference — they come from two different measurement systems. A4 is 210 × 297 mm (8.27 × 11.69 in), fixed by the international ISO 216 standard used across Europe, Asia, and most of the world. Letter is 8.5 × 11 in (215.9 × 279.4 mm), the US and Canadian standard, and isn’t part of that system at all. Letter is very slightly wider and noticeably shorter than A4, which is exactly why a document built for one clips or leaves odd margins on the other. Legal shares Letter’s width but runs longer, at 8.5 × 14 in (215.9 × 355.6 mm) — it’s a US size too, just for longer forms and contracts.
Every page gets the same target size
This applies one target size to the whole document — there’s no way to resize different pages to different targets in a single pass. If you have a document that genuinely mixes page sizes on purpose, resizing will standardize all of them to the one size you choose.
Only three sizes for now
A4, Letter, and Legal cover the vast majority of real printing needs, but there’s currently no option for a custom or less common paper size — if you need something outside those three, this tool isn’t the right fit yet.
Landscape pages don’t get rotated
A4, Letter, and Legal here are all portrait targets. If a page in your file is landscape — a wide slide deck or a spreadsheet printout, say — it gets shrunk to fit inside that portrait shape rather than rotated to match its orientation. The content stays intact and proportional, but you’ll end up with a landscape page shrunk down with a strip of white space above and below it, instead of a page that fills the sheet edge to edge. If you need the page rotated first, run it through Rotate PDF before resizing.