How to Resize a PDF to A4 (or Any Paper Size)
Put every page of a PDF on A4, A5, A3, Letter or a custom size — content scaled to fit, nothing stretched or cut off, text still sharp. Free, in your browser.
3 min read ·
To change the page size of a PDF, open Resize PDF, add the file, choose A4 (or Letter, Legal, A3, A5, Tabloid, or a custom size in millimetres), and download. Every page is placed on the new paper size with its content scaled to fit and centred — nothing is stretched or cut off, and vector text stays perfectly sharp.
Resize a PDF step by step
- Open Resize PDF and add your PDF.
- Choose the page size: A4, Letter, Legal, A3, A5, Tabloid, or Custom and type the width and height in millimetres.
- Choose the orientation: Auto keeps landscape pages landscape and portrait pages portrait; or force every page to Portrait or Landscape.
- Add a margin with the slider (up to 30 mm) if you need room for binding, hole punching, or a printer that can't print to the edge.
- Download the resized PDF.
Why resize a PDF?
- Printing: pages of mixed or odd sizes print with clipped edges or strange margins. Putting everything on A4 (or Letter) prints cleanly.
- Upload requirements: some portals and print services insist on A4 pages.
- Mixed documents: scans, screenshots and exports combined into one PDF often have every page a different size. Resizing makes them uniform.
- Booklets and handouts: shrink A4 pages to A5, or enlarge A5 to A4 for easier reading.
- Posters: scale a document up to A3 or Tabloid.
Paper sizes at a glance
| Size | Millimetres | Inches | Used for |
|---|---|---|---|
| A4 | 210 × 297 | 8.3 × 11.7 | Standard paper outside North America |
| A5 | 148 × 210 | 5.8 × 8.3 | Booklets, notebooks, flyers |
| A3 | 297 × 420 | 11.7 × 16.5 | Posters, drawings, spreads |
| Letter | 216 × 279 | 8.5 × 11 | Standard paper in the US and Canada |
| Legal | 216 × 356 | 8.5 × 14 | Legal documents in North America |
| Tabloid | 279 × 432 | 11 × 17 | Newsletters, large prints |
Scaling, explained
Pages are scaled in proportion, so a page whose shape doesn't match the new paper gets a little white space on two sides rather than being stretched or cropped. Going from A4 to Letter, for example, adds a thin band at the top and bottom; going from Letter to A4 adds a band at the sides. See how to convert US Letter PDFs to A4 for that common case.
Because the content is scaled rather than re-drawn as an image, text and drawings stay sharp at any size. Scanned pages are images, so enlarging a small scan a lot will look soft.
Resizing images into a PDF
If your pages are photos or screenshots rather than a PDF, create the PDF at the right size from the start: Image to PDF puts each image on an A4 or Letter page.
Resize, crop or print several per page?
- Resize — same content, different paper size.
- Crop — remove margins or borders with Crop PDF.
- N-up — print several pages on one sheet with N-up PDF.
Frequently asked questions
Will text become blurry?
No. Text and vector graphics are scaled, not rasterised, so they stay crisp.
Can I resize just one page?
The tool resizes every page. To resize a single page, split it out with Split PDF, resize it, and merge it back.
Is my PDF uploaded?
No. Resizing happens in your browser.