A4 Print Size in Pixels at 300 DPI

Converting millimetres to pixels

The formula is simple: millimetres ÷ 25.4 × 300. For A4 that's 210 ÷ 25.4 × 300 ≈ 2480 px wide, and 297 ÷ 25.4 × 300 ≈ 3508 px tall. That's the number most print shops expect for a full-bleed A4 at 300 DPI, though some templates round slightly differently — to 2490×3510, say. When a partner gives you a template, use their number over any blog table, including this one.

Because every ISO A size shares the same ratio, you can scale one down to make another honestly — an A3 file scaled down reads as a true A4. That's not something you can do with US sizes; scaling a 16×20 down to 12×18 changes the shape, not just the size.

Why A4 isn't 8×10 or US Letter

8×10 inches works out to 203×254 mm, a 4:5 ratio. A4 is 210×297 mm. US Letter is 8.5×11 in, or 2550×3300 px at 300 DPI. None of the three match. Force a US crop into an A4 frame and heads stretch long. Add white borders instead, and buyers get paper they never ordered.

Selling to both markets? Keep one focal point on the original, then export 8×10 and A4 as two separate custom ratios. That's the whole trick to skipping a second Photoshop session for every painting.

Bleed, printers, and home A4

Home inkjets set to "fit to page" shrink your art to leave room for a hardware margin. For a true edge-to-edge A4, choose a shop that prints full bleed, or add bleed yourself if their template calls for it — often 3 mm. That nudges the pixel count up slightly, so follow the shop's template rather than a generic table.

Printing at "100%" from a 72 DPI screenshot is exactly how A4 photos end up the size of a stamp on the page. Build the file at 2480×3508 pixels and 300 DPI first, then print at 100% or "actual size" — not "fit."

Exporting A4 from Reopic

Open Studio and add a custom ratio of 210 × 297 mm (swap the numbers for landscape). Export Artwork, and the ZIP folder is named with those millimetres — so you can tell at a glance it isn't an 8×10. Free gives you three custom ratios a day, enough to cover A4, A3, and 8×10 from one image. Pro is a one-time $33.

Worked example: a US listing that also ships to the UK

Say you sell 8×10 prints in the US and start taking UK orders. From the same pin, export 2400×3000 for 8×10 and 2480×3508 for A4. The A4 crop runs taller, so expect more floor or sky in the frame — and double-check the signature doesn't get chopped. If A4 reveals a messy studio edge, either clone it out or sell A4 as a matted SKU instead.

In your Etsy variation, label the options clearly: "8×10 in (US frame)" and "A4 (210×297 mm)" — don't let buyers assume they're interchangeable. Upload the matching production file to your printer for each one. A single 8×10 JPEG forced into an A4 slot is exactly how stretched faces end up in EU reviews.

Home printers and "fit to page"

Buyers of digital A4 files often print from Preview or Windows Photos with "fit" turned on. That shrinks a correctly-sized 2480×3508 file to leave room for the printer's unprintable margin — and then they complain the print came out small. Add a line to your listing: print at 100% / actual size on A4, or use borderless printing if the hardware supports it.

If you sell a physical A4 print, you control the press, so this is on you. If you sell a digital download, you control the instructions instead. Either way, the file itself needs to be the real A4 pixel box — not a US Letter JPEG with the label changed.

Want to offer A3 as well? You can scale an A4 crop up only if the original still has 3508 pixels on the short side after cropping. Otherwise, export A3 straight from the original using the same pin — the ISO ratios line up, but you still need the pixels to back it up. A3 at 300 DPI is 3508×4961. A phone photo that barely covers A4 won't hold up at A3.

FAQ: A4 print size pixels 300 DPI