# Resize PDF Pages — Change PDF page size (A4 to Letter) on Mac

Change every page to A4, US Letter or another size, scaling the content to fit. Part of OneMacTools, 151 private tools in one native Mac app (macOS 26 or later); category: PDF. Runs on your Mac; nothing is uploaded.

Convert a PDF between A4, US Letter, Legal, A3, A5 and Tabloid. Each page's content is scaled to fit and centred, in portrait, landscape, or matching each page.

Page: https://www.onemactools.com/tools/resize-pdf-pages · Download: https://www.onemactools.com/download · Pricing: https://www.onemactools.com/pricing

## How to use it
1. **Add the PDF.** Drop one or more PDFs onto Resize PDF Pages.
2. **Choose the paper.** In the right-hand panel, pick the page size you need, such as A4 or US Letter.
3. **Set orientation and margin.** Choose Match each page, Portrait or Landscape, and add a margin if the content needs room from the edge.
4. **Resize.** Click Resize. Every page's content is scaled to fit the new size and centred.
5. **Check the result.** The new PDF, named with its new size, is saved in a dated folder in Downloads › OneMacTools. Open it with the Preview (eye) button.

## Options
- **Page size:** A4 (the default), US Letter, US Legal, A3, A5 or Tabloid. Every page in the file is changed to this size.
- **Orientation:** Match each page (the default) keeps landscape pages landscape and portrait pages portrait. Portrait or Landscape forces every page one way.
- **Margin:** 0–30 mm, 0 by default. Adds white space around the content on every page, useful for printers that can't print to the edge.

## Tips
- Content is scaled to fit without stretching, so an A4 page on US Letter gets a thin white band at the top and bottom. That's expected.
- Use a 5 mm margin when printing at home, so nothing is lost at the edges.
- Merged PDFs often have pages of different sizes. Resizing them all to one size makes them print and read evenly.
- Leave Orientation on Match each page for documents with a few landscape tables or charts.

## Questions
**How do I change a PDF from A4 to US Letter on a Mac?**
Drop the PDF onto Resize PDF Pages, set Page size to US Letter and click Resize. Each page is scaled to fit Letter paper and centred.

**Will the content be stretched?**
No. It's scaled evenly to fit inside the new page and centred, so the proportions stay the same.

**How do I make all pages in a PDF the same size?**
Run it through Resize PDF Pages with the size you want. Every page comes out at that size, whatever it was before.

**Can I shrink A3 pages to print on A4?**
Yes. Choose A4 and the A3 content is scaled down to fit.

**Does the text stay sharp?**
Yes. Pages are redrawn as vector content, so text stays crisp and selectable.

**How do I add margins to a PDF?**
Set Margin to the amount you want, even with the same page size, and the content is shrunk slightly to leave that space around it.