Sizes
| Size (in) | Size (cm) | Ratio | Mpix | Shutterfly | Walgreens |
|---|---|---|---|---|---|
| 2.5 x 3.5 | 6.4 x 8.9 | 5:7 | Wallet. 250 x 350 minimum, 625 x 875 optimal. | Wallet. Photos under 640 x 480 recommended. | Not listed. |
| 4 x 6 | 10.2 x 15.2 | 2:3 | Print. 400 x 600 minimum, 1000 x 1500 optimal. | Print. 640 x 480 minimum, 1024 x 768 listed for 4x6. | Print. 540 x 360 minimum. |
| 8 x 10 | 20.3 x 25.4 | 4:5 | Print. 800 x 1000 minimum, 2000 x 2500 optimal. | Print, Poster. 1600 x 1200 recommended. | Print. 900 x 720 minimum. |
| 16 x 20 | 40.6 x 50.8 | 4:5 | Print. 1600 x 2000 minimum, 4000 x 5000 optimal. | Print, Poster. 2000 x 1600 recommended. | Poster. 2980 x 2384 minimum. |
| 24 x 36 | 61 x 91.4 | 2:3 | Print, Poster. 2400 x 3600 minimum, 6000 x 9000 optimal. | Not listed. | Poster. 5400 x 3600 minimum. |
| 12 x 36 | 30.5 x 91.4 | 1:3 | Print. No pixel size published. | Print. No pixel size published. | Not listed. |
| 36 x 48 | 91.4 x 121.9 | 3:4 | Poster. No pixel size published. | Not listed. | Not listed. |
Centimetres use 1 inch = 25.4 mm (NIST), to one decimal place. Ratios are short side first.
Sources, read 22 October 2026: Mpix wallets, pixel guide, prints, posters; Shutterfly prints, pixel guide, posters; Walgreens Photo prints, pixel guide, posters, developer page.
How to use the tool
- Add a photo, or drop one on the box.
- Pick a print size, then drag and zoom the crop.
- Read how large it prints at 300 ppi and download a JPG or a PNG.
Small, large, panoramic and poster
Wallets are 2.5 x 3.5 at Mpix and Shutterfly and 2 x 3 at Walgreens Photo. Walgreens sells its larger sizes, up to 24 x 36, as posters.
Mpix and Shutterfly both list 5 x 15, 8 x 24 and 12 x 36 panoramic prints. Mpix sells 36 x 48 as a poster only.
Questions
Is it private?
Yes. The crop runs in your browser and nothing is uploaded. The HEIC decoder downloads once, when you first add a HEIC photo.
Why 300 ppi?
It is the labs' figure. Mpix recommends 250-300 DPI, Walgreens at least 200 PPI (its developer page says 300 DPI), and Shutterfly 300 dpi or higher for scans. The tool divides your pixels by 300.
HEIC decoding uses heic-to and libheif, free software licensed under the GNU LGPL 3.0. They are included unmodified as a separate file, loaded only when you add a HEIC photo. The source code is at the links above.