Paper Size to Pixels Converter
Find out how many pixels wide and tall one standard paper size is at your chosen DPI. Useful for digital documents, print-ready PDFs and image exports. For the logic behind A-series sizes, see the A-Series Paper Sizes guide.
Pixel dimensions at common DPI values
| Paper | 72 DPI | 150 DPI | 300 DPI |
|---|
How it works
Millimetres are converted to inches (1 inch = 25.4 mm), then multiplied by the DPI: pixels = size in inches × DPI. For example, A4 paper is 210 × 297 mm, which is about 8.27 × 11.69 inches; at 300 DPI that gives roughly 2480 × 3508 pixels.
Frequently asked questions
When to use this calculator
- Setting up a new document in Photoshop, Affinity, GIMP or Canva at a paper size such as A4 or Letter.
- Exporting a print-ready PDF or image and checking it contains enough pixels.
- Comparing an A4 design with US Letter before sending it to an overseas print service.
- Checking why two websites list slightly different pixel sizes for the same paper.
Worked examples
- A4 at 300 DPI: 2480 × 3508 pixels - the standard starting point for A4 posters, menus and documents.
- A3 at 150 DPI: 1754 × 2480 pixels, enough for a large poster read from a few feet away.
- US Letter at 300 DPI: 2550 × 3300 pixels, the equivalent of 8.5 × 11 inches.
- A5 flyer at 300 DPI: 1748 × 2480 pixels before adding bleed.
Why rounded millimetres cause different results
A4 is exactly 210 × 297 mm, which is 8.2677 × 11.6929 inches. Some converters round to 8.27 × 11.69 inches before multiplying by DPI, producing 2481 × 3507 instead of 2480 × 3508. The one-pixel difference is invisible in print; use the exact millimetre values (as this tool does) when precision matters.
Before you export a print-ready file
- Set the document to the paper size plus bleed if the design runs to the edge.
- Check that placed images have at least the calculated pixel dimensions, not just the DPI tag.
- Keep text inside the safe margin, away from the trim edge.
- Confirm the colour mode and file format your print service prefers.
Common mistakes
- Designing at 72 DPI because the screen preview looks fine, then discovering the file is too small for print.
- Forgetting that bleed adds to the document size - an A4 flyer with 3 mm bleed is 216 × 303 mm, not 210 × 297 mm.
- Using a pixel size from another website without checking whether it used rounded inches.
Related tools
Common print sizes chart · Paper sizes in pixels guide · Bleed calculator · Print size calculator
How many pixels is A4 at 300 DPI?
2480 × 3508 pixels (portrait). Some print services round this to 2481 × 3509; the difference is not visible.
Why do different sites give slightly different pixel sizes for A4?
Because they round the millimetre dimensions (297 mm is often rounded to 11.69 inches instead of 11.6929). Our table rounds to the nearest whole pixel after using exact millimetre values.
What DPI should I use for a print-ready PDF?
300 DPI is the standard for documents and photos. 150 DPI is acceptable for large posters viewed from a distance. 72–96 DPI is only for screen display.