PDF Resizer Online
APX Resizer can resize the pages of a PDF to A4, A3 or US Letter. Each page is scaled to fit the new page size, and the work happens in your browser.
Free. No sign-up. Your files stay in your browser.
How to resize PDF pages
- Select Open PDF page resize and choose one PDF file.
- Pick the target size: A4, A3 or Letter.
- Run the tool and download resized.pdf.
What PDF page resize does
The tool changes the page dimensions of every page in the PDF and scales the content to fit inside the new size, keeping its proportions. It is handy when a document must be A4 for printing or Letter for a US office.
Page size is not file size
Changing the page size does not make the file much smaller. To reduce file size, try the PDF compressor. To remove unwanted margins, use Crop PDF on the tools page.
Private by design
APX Resizer works inside your browser. Your files are processed on your own device and are not uploaded to our servers. Read the privacy policy for details.
Frequently asked questions
How do I change a PDF to A4 size?
Open PDF Page Resize, choose your PDF, select A4 and download the resized file.
Which page sizes are available?
You can resize pages to A4, A3 or Letter.
Does resizing a PDF make the file smaller?
Not noticeably. Resizing changes the page dimensions. Use Compress PDF if you want a smaller file.
Can I resize more than one PDF at once?
The tool works on one PDF at a time. Select a single PDF file for each run.
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Last updated: November 2026