Change page size — A4, Letter, A3, Legal and more
Last updated: 2026-10-08
Resize PDF is a free online tool that changes the page dimensions of a PDF to A4, Letter, A3, Legal, or a fully custom size. It's used when a document needs to match a specific print or submission standard — for example, converting a US Letter-sized PDF to A4 for printing outside the United States, or fitting a document to a non-standard page size required by a form or institution. Resizing happens entirely client-side using pdf-lib, so the source file is never uploaded to a server. Content scales to fit the new page dimensions while preserving the original layout proportions. There is no file-size limit and no cap on the number of pages resized in one operation. The tool requires no account or installation, and works identically across desktop and mobile browsers, producing a downloadable resized PDF within seconds of selecting the target page size.
Yes, all 32 tools are 100% free forever. No hidden charges, no premium version, no login required.
No. We have zero file size restrictions. Process any PDF of any size, as many times as you want.
Absolutely. All processing happens locally in your browser. Your files never get uploaded to any server. 100% private.
Never. No account, no email, no registration. Just open the tool and start using it instantly.
Yes. PDF Master Pro works on all devices — desktop, tablet, and mobile — in any modern browser.