A4 is 210 × 297 mm — here’s exactly how many pixels that is at every common DPI, plus a converter below for margins, bleed and other sizes.
A4 paper is 210 × 297 mm (8.27 × 11.69 in). Its pixel size depends entirely on the DPI you export at — there’s no single correct answer without one. Here are the pixel dimensions at every DPI you’re likely to run into:
| DPI | Pixels (px) |
|---|---|
| 72 | 595 × 842 px |
| 96 | 794 × 1123 px |
| 150 | 1240 × 1754 px |
| 300 | 2480 × 3508 px |
| 600 | 4961 × 7016 px |
For comparison at 300 DPI: A3 (297 × 420 mm) is 3508 × 4961 px, A5 (148 × 210 mm) is 1748 × 2480 px, and US Letter (8.5 × 11 in) is 2550 × 3300 px.
Everything runs locally in your browser. Nothing is uploaded to any server — close the tab and your files are gone.
The converter below already has mm, cm, in and px linked together — pick A4 from the paper size preset and any DPI to see its pixel size instantly.
Toggle portrait or landscape to flip A4 between 210 × 297 mm and 297 × 210 mm and see both pixel sizes.
Set bleed and safe margin in mm to get the trim size, the size with bleed, and the safe area for an A4 print job, in both mm and px.
Swap the preset to any ISO A or B size, US Letter, Legal or Tabloid, or a business card, credit card or postcard, and get the same breakdown.
The number you need depends on where the file is going. These are the four situations that send most people looking for an A4 pixel size in the first place, with the arithmetic already done.
Print shops ask for 300 DPI, so the artboard starts at 2480 × 3508 px. What catches people out is bleed: 3 mm on all four sides makes the sheet 216 × 303 mm, which is 2551 × 3579 px — an extra 71 px on each axis that the guillotine is meant to cut away. Keep headlines and logos at least 5 mm (59 px at 300 DPI) inside the trim line, or a millimetre of drift at the cutter will clip them. For any other bleed value, the mm to px converter does the conversion.
At 96 DPI — the resolution a browser means when it says one inch — A4 is 794 × 1123 px, and that is plenty for a report, a CV or a deck that lives on screen. Exporting the same page at 300 DPI multiplies the pixel count by roughly 9.8× and the file size along with it, for detail no monitor can display. If the PDF has to survive an email attachment limit, keep the page at 96 DPI and shrink the photos inside it with the image compressor before you place them.
Scanner software asks for DPI before anything else. 300 DPI (2480 × 3508 px) is the sensible default for a document you want to read, archive and reprint. Step up to 600 DPI (4961 × 7016 px, about 34.8 megapixels) only for small type, fine line art or pages headed into OCR — that is four times the pixels for the same sheet of paper. The scan stores its resolution in the file header, so when a later tool reports the wrong figure you can rewrite the DPI tag without touching a single pixel.
Run the maths backwards: pixels ÷ 300 × 25.4 gives millimetres. A 1920 × 1080 screenshot comes to 163 × 91 mm at 300 DPI — under half an A4 sheet — and stretching it to the full 210 mm width drops it to about 232 DPI. As a rule of thumb, anything below 2480 px on the long edge will not fill an A4 page at print quality, whatever its DPI tag claims; our guide to reaching 300 DPI explains what that tag does and does not change.
Every row below describes the same sheet of paper — 210 × 297 mm — measured at a different resolution. Pick the row that matches where the file is going rather than the largest number available.
| DPI | A4 in pixels | Use it for | Keep in mind |
|---|---|---|---|
| 72 | 595 × 842 px | Legacy screen work and anything measured in PostScript points. | Comes from the old 72-points-per-inch convention, not from any real display. Far too coarse to print. |
| 96 | 794 × 1123 px | Screen-only PDFs, web previews, UI mockups of a printed page. | The CSS reference resolution browsers use. Crisp on screen, visibly soft on paper. |
| 150 | 1240 × 1754 px | Office laser proofs, internal drafts, posters read from a distance. | A quarter of the pixels of a 300 DPI export. Small type and hairline rules start to look ragged up close. |
| 300 | 2480 × 3508 px | Commercial offset and digital printing — brochures, flyers, magazines. | The industry default, and what a print shop means when it asks for “300 DPI”. |
| 600 | 4961 × 7016 px | Line art, scans of small type, OCR sources, fine engraved detail. | Four times the pixels of 300 DPI for the same sheet — around 34.8 megapixels, and heavy to edit. |
Pixel figures are rounded to the nearest whole pixel from 210 × 297 mm, so a tool that rounds differently may show one pixel more or less on an edge.
At the print standard of 300 DPI, A4 is 2480 × 3508 px (210 ÷ 25.4 × 300 and 297 ÷ 25.4 × 300, both rounded). That’s the size to design or export at for brochures, flyers and anything headed to a commercial printer.
At 96 DPI — the reference resolution browsers and most UI design tools use — A4 is 794 × 1123 px. That’s enough detail for reading on a screen or a PDF that never gets printed, at a much smaller file size than a 300 DPI export.
The ISO 216 series is built so each size folds exactly in half into the next: fold A3 in half and you get A4; fold A4 in half and you get A5. Each step down halves the area (and each step up doubles it), while keeping the same width-to-height ratio throughout the series.
Word defines its A4 page in inches/points and only converts to pixels for on-screen display, typically at 96 DPI — it has no native “pixel” size. Photoshop instead rasterizes the page at whatever resolution (PPI) you chose when you created the document, so a 72 PPI file and a 300 PPI file give completely different px counts for the same physical A4 sheet.
Because a millimeter has no pixel size until you pick a DPI. A4’s physical dimensions (210 × 297 mm) never change, but the pixel count scales with whatever resolution you’re exporting or displaying at — 595 × 842 px at 72 DPI versus 2480 × 3508 px at 300 DPI is the same sheet of paper.
Yes — the converter below has A4 built in as a paper size preset, with a bleed and safe margin section underneath that shows trim size, size with bleed, and safe area in both mm and px at once.
They come from different screen conventions. The older 72 DPI convention gives A4 as 595 × 842 px, while the 96 DPI CSS reference used by browsers gives 794 × 1123 px. Neither changes the physical A4 size of 210 × 297 mm; the chosen DPI only changes how many pixels represent it.
At 300 DPI, portrait A4 is 2480 × 3508 px and US Letter is 2550 × 3300 px. Letter is slightly wider and shorter because its physical size is 8.5 × 11 inches, while A4 is 210 × 297 mm. Choose the preset that matches the paper the document will actually use.
No. It swaps the width and height: at 300 DPI, portrait is 2480 × 3508 px and landscape is 3508 × 2480 px. The DPI, physical paper size and total number of pixels all stay the same.
A 3 mm bleed is the usual request, and at 300 DPI the bleed-inclusive sheet of 216 × 303 mm works out to 2551 × 3579 px. Convert the full size in one step rather than converting 3 mm on its own and doubling it: 3 mm rounds to 35 px, and 2480 + 35 + 35 gives 2550 px, one pixel short of the correct figure. The rounding error is harmless on a proof and annoying on a template.
A4 at 150 DPI is 1240 × 1754 px. It prints acceptably on an office laser printer, on internal drafts, and on posters nobody reads from arm’s length — but it holds a quarter of the pixels of a 300 DPI file, so fine serif type and thin rules look ragged in close-up commercial printing. Use it as a proofing size, not a delivery size.
Rarely. Most presses and photo printers cannot resolve meaningfully more than 300 DPI of continuous-tone detail, so a 600 DPI A4 photo mainly buys you a 4961 × 7016 px file — about 34.8 megapixels — that is slower to edit and slower to transfer. Where 600 DPI does earn its place is line art, engraved detail, small type and scans destined for OCR, where hard edges benefit from the extra sampling.
About 8.7 megapixels: 2480 × 3508 comes to 8,699,840 pixels. Held uncompressed as 8-bit RGB that is roughly 26 MB in memory (three bytes per pixel), which is why a multi-page A4 document at 300 DPI grows so quickly — and why a JPEG or PNG of the same page, being compressed, lands far below that on disk.