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Hit exactly 2480×3508 — a full A4 page at the 300 DPI printers ask for.
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A4 is 210×297 millimetres, and at 300 DPI that is 2480×3508 pixels — the size to use for a full-bleed poster, a flyer, a certificate or any image that will fill a printed page. The ratio is roughly 1:1.414, the same proportion shared by every A-series paper size, which is why an A4 design scales cleanly to A3 or A5. Two practical notes: printers cannot usually print to the very edge, so keep essential content away from the outer few millimetres unless your print shop handles bleed; and a photo from a phone is nowhere near 3508 pixels tall, so enlarging one to fill A4 will look soft. Fit mode with a white background is the reliable choice when the whole image must appear intact.
2480×3508 at 300 DPI. At 150 DPI it is 1240×1754, which is fine for a draft but visibly softer in a final print.
Yes. All A-series sizes share the 1:√2 proportion, so an A4 layout scales to A3 or A5 without any cropping.
Most printers leave an unprintable margin. Unless your print shop supports full bleed, anything within a few millimetres of the edge risks being cut off.
Only if the original is large. Phone photos are often around 3000–4000 pixels wide, which can work in landscape, but heavy upscaling will look soft on a full page.
No. Resizing runs entirely in your browser with the Canvas API, so the file never leaves your device and nothing is stored or transmitted.
It's free, private and works right in your browser — no signup, no watermark.