Paper, envelopes, screens, and social images in one printable chart. Every number is width by height, checked against the published standards.
Paper, envelopes, screens, and social images, all in one place. All sizes are width by height. Paper sizes are exact; social sizes are the recommended upload sizes published by each platform, and platforms change them from time to time, so confirm the current spec before a large print run or campaign.
| Size | Inches | Millimeters | Pixels at 300 DPI | Used for |
|---|---|---|---|---|
| A3 | 11.69 x 16.54 | 297 x 420 | 3508 x 4961 | Posters, large drawings |
| A4 | 8.27 x 11.69 | 210 x 297 | 2480 x 3508 | Standard office paper outside North America |
| A5 | 5.83 x 8.27 | 148 x 210 | 1748 x 2480 | Booklets, notebooks, flyers |
| A6 | 4.13 x 5.83 | 105 x 148 | 1240 x 1748 | Postcards, small cards |
| US Letter | 8.5 x 11 | 215.9 x 279.4 | 2550 x 3300 | Standard office paper in the US and Canada |
| US Legal | 8.5 x 14 | 215.9 x 355.6 | 2550 x 4200 | Contracts, forms |
| Tabloid / Ledger | 11 x 17 | 279.4 x 431.8 | 3300 x 5100 | Two Letter sheets side by side; small posters |
A4 is slightly narrower and taller than US Letter. Each A size is half the area of the size above it: fold an A4 sheet in half and you get A5.
| Envelope | Inches | Millimeters | Holds |
|---|---|---|---|
| US #10 | 4.125 x 9.5 | 104.8 x 241.3 | Letter folded in thirds, the standard US business envelope |
| DL | 4.33 x 8.66 | 110 x 220 | A4 folded in thirds, the standard business envelope outside North America |
| C5 | 6.38 x 9.02 | 162 x 229 | A4 folded in half, or A5 flat |
| C6 | 4.49 x 6.38 | 114 x 162 | A4 folded in quarters, or A6 flat |
| C4 | 9.02 x 12.76 | 229 x 324 | A4 flat, no folding |
| Name | Pixels | Aspect ratio | Where you meet it |
|---|---|---|---|
| HD | 1280 x 720 | 16:9 | Entry-level laptops, older TVs, YouTube 720p |
| Full HD | 1920 x 1080 | 16:9 | Most laptops, monitors, and TVs; YouTube 1080p |
| QHD | 2560 x 1440 | 16:9 | Higher-end monitors and laptops |
| 4K UHD | 3840 x 2160 | 16:9 | Modern TVs and high-end monitors |
| 8K UHD | 7680 x 4320 | 16:9 | Flagship TVs |
| Platform and placement | Pixels | Notes |
|---|---|---|
| Instagram square post | 1080 x 1080 | 1:1 |
| Instagram portrait post | 1080 x 1350 | 4:5, the recommended feed ratio |
| Instagram Stories and Reels | 1080 x 1920 | 9:16 full screen vertical |
| Instagram profile photo | 320 x 320 | Upload size; shown as a circle |
| Facebook profile photo | 170 x 170 | Desktop display size; upload a larger square for sharpness |
| Facebook cover photo | 851 x 315 | Cropped on mobile, so keep key content centered |
| Facebook link image | 1200 x 630 | 1.91:1, the standard link preview size |
| X (Twitter) header | 1500 x 500 | 3:1; the profile photo covers the lower left |
| X (Twitter) profile photo | 400 x 400 | Shown as a circle |
| YouTube video thumbnail | 1280 x 720 | 16:9 |
| YouTube channel banner | 2560 x 1440 | 16:9; keep text in the central 1546 x 423 px safe area, which is what shows on every device |
| Professional network profile banner | 1584 x 396 | 4:1; the profile photo covers the left side |
| Region | Inches | Millimeters |
|---|---|---|
| US standard | 3.5 x 2 | 88.9 x 50.8 |
| Europe, common size | 3.35 x 2.17 | 85 x 55 |
What is the difference between A4 and US Letter? A4 is 210 by 297 mm (8.27 by 11.69 inches) and US Letter is 8.5 by 11 inches (215.9 by 279.4 mm). A4 is a little narrower and a little taller. A4 is the standard in most of the world, while Letter is the standard in the US and Canada.
What size should I export a social media image at? Export at the recommended pixel size in the table above, usually 1080 px on the short side for posts. Platforms shrink larger uploads and stretch smaller ones, so starting at the right size keeps text sharp.
How many pixels is an A4 page at 300 DPI? 2480 by 3508 pixels. Multiply inches by the DPI: 8.27 inches times 300 is about 2480, and 11.69 inches times 300 is about 3508.