A4 paper measures 210 × 297 mm. Its pixel dimensions change with PPI; the physical trim size does not.
A4 measures exactly 210 × 297 mm (21 × 29.7 cm), or approximately 8.27 × 11.69 inches. At 300 PPI, portrait A4 rounds to 2480 × 3508 pixels.
300 PPI: 2480 × 3508 px · trim size onlyPortrait values are rounded to the nearest whole pixel after converting the native physical dimensions.
| PPI | Width | Height | Use context |
|---|---|---|---|
| 72 | 595 px | 842 px | Layout or screen reference |
| 96 | 794 px | 1123 px | Layout or screen reference |
| 150 | 1240 px | 1754 px | Print / distance dependent |
| 240 | 1984 px | 2806 px | Print / distance dependent |
| 300 | 2480 px | 3508 px | Detailed print target |
| 600 | 4961 px | 7016 px | Detailed print target |
US Letter is 5.9 mm wider and 17.6 mm shorter than A4 in portrait orientation. A full-page layout can reflow or crop when switched between them.
Compare US LetterAdding 3 mm on every edge creates a 216 × 303 mm artwork canvas, which rounds to 2551 × 3579 pixels at 300 PPI.
Calculate another marginISO 216 defines the physical A4 trim. Pixel dimensions exist only after you choose a PPI, and bleed is a separate production value.
A4 is the default document size across most ISO-paper markets, so it appears in office reports, worksheets, invoices, handouts, magazines and home printers. It is usually the right starting point when the recipient expects a normal document rather than a North American Letter page.
A4 and US Letter are close but not interchangeable: Letter is 5.9 mm wider and 17.6 mm shorter in portrait. That difference can move page breaks, crop a full-page background or alter margins. Maintain separate checked layouts when the same document must serve both formats.
An edge-to-edge A4 flyer normally needs a bleed canvas larger than 210 × 297 mm, while an office document printed on a desktop device may instead need to respect non-printable margins. The printer's product template decides which workflow applies.
For this A4 example, the printer requests 3 mm bleed on every edge and a 5 mm safe margin inside trim. The artwork canvas becomes 216 × 303 mm, or 2551 × 3579 pixels at 300 PPI. The protected region is 200 × 287 mm. These are example production requirements, not part of the paper standard.
Set the trim before placing the layout, extend the real background into bleed, and keep faces, lettering and other essential content inside the provider’s safe margin. A raster canvas and a PDF with page boxes describe the same physical job differently; do not scale all artwork simply to include an export border.
Recalculate with your printer’s exact marginsA4 identifies the final physical format. Bleed expands the artwork beyond that edge; a safe margin moves important content inward. Those extra values depend on the print provider.
Calculate bleed and safe areaUse the source pixels, final orientation and intended crop for documents, worksheets, flyers and home printing; then confirm the required PPI with the provider.