Resize PDF Pages
Scale pages to A4, Letter, Legal, a custom size, or a percentage. Aspect ratio is always preserved. 100% local processing.
How to Resize PDF Pages
Upload the PDF and choose a target. A4, Letter, and Legal are the standard office paper sizes, ideal when a document must print correctly on your printer stock. Custom width x height takes exact point values (72 points per inch) for special layouts. Custom percentage scales every page relative to its own size, for example 50 percent for a compact screen-reading copy. Pick Fit inside to keep all content visible with margins, or Fill page to cover the sheet edge to edge with cropping. Click Resize Pages and download.
Fit vs Fill, Explained
Because the tool never distorts content, the page aspect ratio may not match the target sheet. Fit mode centers the scaled page with white space filling the difference, so nothing is ever cut off. Fill mode scales until the sheet is covered and trims the overflow, which looks cleaner for full-page designs but can clip edge content. When converting between similar shapes, like Letter to A4, the difference is tiny; between very different shapes, like a wide slide to A4 portrait, choose deliberately.
Quality Notes
Text and vector graphics are resolution-independent and stay perfect at any scale. Scanned images resample when scaled: shrinking is safe, while large enlargements can soften. The tool embeds each original page as a reusable object, so the output is a proper PDF, not a set of flattened pictures. Everything runs in your browser with pdf-lib; nothing uploads. To trim margins instead of changing page size, use Crop PDF Pages.
Common Size Conversions
A few conversions come up constantly. US Letter to A4 is a slight shrink that fits with small margins. A4 to Letter is the reverse trip for American printers. Legal to Letter crops the extra three inches, so check nothing important lives at the bottom. Presentation slides (often 13.33 by 7.5 inches) fit nicely on A4 landscape with the fit mode. For archiving, converting everything to A4 gives a uniform library where every file prints predictably.
Frequently Asked Questions
How do I resize PDF pages?
Upload your PDF, pick a target: A4, Letter, Legal, a custom width and height, or a scale percentage like 80 percent. Choose whether pages should fit inside the new size or fill it, then click Resize Pages. The tool places each original page, scaled proportionally, onto a fresh page of the target size and downloads the result. All processing is local.
What is the difference between fit and fill?
"Fit inside" scales the page down (or up) so the whole original is visible, adding white margins where the shapes differ. "Fill page" scales so the target page is completely covered, cropping the overflow. Fit is safer for documents where nothing may be cut; fill suits full-bleed layouts. Both keep the original aspect ratio, so nothing is ever stretched or squished.
Will resizing reduce quality?
Vector content like text and line graphics scales perfectly at any size with zero quality loss. Embedded raster images are resampled when scaled significantly, so enlarging a scan well beyond its original size can look soft, while shrinking is always safe. For best results, avoid upscaling scanned pages by large factors.
Can I resize to a custom percentage instead of a paper size?
Yes. Choose the "Custom percentage" target and type a value like 50 to halve every page or 141 to enlarge A5 to A4 proportions. Each page keeps its own size multiplied by your factor. This is the quickest way to shrink a document for screen reading or to standardize odd-sized scans.
My pages have mixed sizes. What happens?
Each page is resized independently using the same rule, so a mixed document stays mixed in the same proportions, just mapped onto the new target. With "fit" mode, every page lands centered on its new sheet with margins as needed. If you want uniform output from mixed input, that is exactly what this tool produces.
Is my document uploaded to a server?
Never. Resizing is done by pdf-lib running entirely in your browser tab. The file is read into memory, each page is embedded at the new scale, and the result downloads straight back. The tool works offline once the page has loaded.