PDF · 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.

Runs on your Mac

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Resize PDF Pages in OneMacTools on a Mac, with sample files and its options

Resize PDF Pages on a Mac

Resize PDF Pages in OneMacTools with sample files loaded and the options panel open — Resize PDF Pages with sample files and its options

The result of Resize PDF Pages on the sample files — What Resize PDF Pages produced from the sample files

Screenshots from the app, using sample files.

How to use Resize PDF Pages

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.

What Resize PDF Pages does

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.

Great for

Print a European A4 document on US Letter paper
Make every page in a merged file the same size
Shrink A3 drawings to print on A4

Options explained

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.

Best practices

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.

Works with

In: PDF files, one or many at once.
Out: A copy of each PDF with every page at the new size, named with that size, for example “Report A4”.

Pages are redrawn onto the new paper, so links, comments and form fields may not carry over.

Questions about Resize PDF Pages

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.

Does Resize PDF Pages upload my files?

No. Resize PDF Pages runs entirely on your Mac, so your files never leave it and it works offline.

Will Resize PDF Pages change my original files?

No. Results are saved as new files in a dated folder in Downloads › OneMacTools, and your originals are left exactly as they were unless you turn on an option that says otherwise.

What does Resize PDF Pages need?

Just a Mac with macOS 26 or later. There's nothing else to install.