A merged document frequently ends up with pages of several different sizes: an A4 report, a Letter-sized form someone in the United States filled in, a scan that came out at an odd dimension because the scanner was set to automatic. It looks untidy on screen and it prints badly, with pages shrinking and shifting unpredictably.
This tool normalises everything to a single page size, A4 or Letter. Each source page is scaled proportionally to fit and centred on the new sheet, so nothing is cropped and nothing is distorted. Orientation is respected: a landscape source page lands on a landscape sheet rather than being squeezed into portrait.
Pages are placed by embedding rather than rendering, so vector text and graphics keep their full resolution and stay selectable.
The resizing is performed by pdf-lib in your browser, so mixed-format bundles are normalised without the document being uploaded.
-edited suffix.| Size | Points | Millimetres | Inches | Used in |
|---|---|---|---|---|
| A4 | 595.28 × 841.89 | 210 × 297 | 8.27 × 11.69 | Most of the world |
| Letter | 612 × 792 | 216 × 279 | 8.5 × 11 | US, Canada, Mexico |
Because the two have different proportions, converting between them always leaves a margin somewhere: A4 content on a Letter sheet leaves space at the top and bottom, and Letter content on A4 leaves space at the sides. That is the correct behaviour — the alternative would be to crop or distort the page.
Each page is scaled by whichever factor is smaller, width or height, so the entire page fits inside the new sheet with its proportions intact. Nothing is cut off and nothing is squashed. The trade-off is the margin that appears on two sides when the aspect ratios do not match.
This also means a page that was smaller than the target grows to fill it, and a page that was larger shrinks to fit. A mixed bundle therefore comes out visually consistent, which is the whole point.
No. Pages are scaled proportionally to fit inside the new sheet and centred, so the entire original page is always visible. Margins appear where the proportions do not match.
No. Pages are embedded as PDF content rather than rendered to images, so vector text and graphics scale mathematically and stay perfectly sharp. Text also remains selectable.
They stay landscape. The tool detects orientation per page and rotates the target dimensions accordingly, so a landscape page is fitted to a landscape sheet.
A4 if the document will be printed anywhere outside North America, Letter if it will be printed in the US, Canada or Mexico. If in doubt, match whatever your printer has in its tray.
Not currently. A4 and Letter are the two options, which covers essentially all office printing.
No. pdf-lib performs the resize inside your browser tab.