Resize PDF pages
Standardise a mixed-size PDF to A4, US Letter, A3 or any custom dimension. Content is scaled to fit the new canvas — processed locally with no server involved.
or drop files here
Tip: select a single file.
How to use Resize Pages
- 1Click "Select PDF file" and choose the PDF whose page size you want to change.
- 2Pick a target page size (e.g. A4, Letter) or enter custom dimensions.
- 3Click Resize PDF. The reformatted file is built in your browser and downloaded.
Why use PDF Lab
- Rescale pages to any standard size — A4, Letter, Legal, and more.
- Files stay on your device — nothing is uploaded to any server.
- No account, no signup, no watermark on the output.
- Free to use with no per-file limits beyond your device's memory.
- Works on desktop and mobile browsers, including offline after first load.
- Enter custom dimensions for non-standard print or display formats.
Your file never leaves your browser
Resize Pages runs entirely on your device using pdf-lib and pdf.js — both self-hosted by PDF Lab, so no third-party CDN sees your traffic. There is no upload, no account, no log of your file.
How browser-based PDF processing works →Resize Pages — questions
- No. Every operation runs in your browser using JavaScript. Your file is loaded into your browser's memory, processed, and a result is saved to your device. Nothing is sent over the network.
- No. Because the processing happens in your browser, neither PDF Lab nor any third party has access to the file contents. You can verify this by opening your browser's network tab while using the tools — no file data is transmitted.
- There is no enforced limit, but performance depends on your device's memory. Most modern browsers comfortably handle PDFs up to about 100 MB. Very large files may slow down your browser tab.
Are my files uploaded to your server?+
Can PDF Lab see the contents of my files?+
Are there file size limits?+
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