16×20 vs 18×24Framed Print vs Poster Size
Both are statement sizes, but 18×24 is 35% bigger and uses a taller 3:4 poster ratio versus 16×20's 4:5 — so one file won't fill both without white bars or a crop.
Quick Answer
What is the difference between 16×20 and 18×24 print size?
Pixel Dimensions for 16×20 and 18×24 at 300 DPI
Exact pixel dimensions print shops and home printers need for sharp output. Always export at 300 DPI so a large print stays crisp once it is on the wall.
| Size | Pixels (300 DPI) | Ratio | Area | SnapToSize |
|---|---|---|---|---|
| 16×20 (portrait) | 4800×6000 px | 4:5 | 320 sq in | 4:5 Pack |
| 16×20 (landscape) | 6000×4800 px | 5:4 | 320 sq in | 4:5 Pack |
| 18×24 (portrait) | 5400×7200 px | 3:4 | 432 sq in | 3:4 Pack |
| 18×24 (landscape) | 7200×5400 px | 4:3 | 432 sq in | 3:4 Pack |
How Much Bigger Is 18×24 Than 16×20?
An 18×24 print covers 432 square inches, while a 16×20 covers 320 square inches — 35% more surface area. Both are large, so the size jump is less dramatic than the gap from a mid-size, but 18×24 still reads as the bigger, bolder piece, especially because it is taller in proportion.
The proportion is the real story here. 18×24 stretches taller relative to its width, which is exactly why posters use it — it gives type, figures, and graphic layouts room to breathe vertically. 16×20 is squarer and sits more naturally among framed photos and art prints.
Why One File Won't Fill Both Sizes
16×20 and 18×24 are both large, but their aspect ratios are different enough to be obvious — and that forces separate exports:
Scale a 16×20 design to fill an 18×24 and the top and bottom either show white bars or the image stretches taller and distorts. With a 0.05 ratio gap, that distortion is easy to spot. Keep each size at its own ratio — and when you specifically need 18×24 from artwork built at 4:5, a Perfect Fit crop reframes it to 3:4 without stretching, with you choosing what stays in frame.
The clean approach: export 4800×6000 px for 16×20 and 5400×7200 px for 18×24. SnapToSize generates both from a single upload — no Photoshop, no manual resizing, no guessing which edge to crop.
Offering 16×20 and 18×24 means two canvases, two exports, and re-checking that neither one cropped the edges or came out soft.
Upload once. SnapToSize generates both sizes at the correct pixel dimensions and 300 DPI — no cropping, guaranteed under 20MB.
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Can You Put a 16×20 Print in an 18×24 Frame?
Yes — with a mat. An 18×24 frame with a 16×20 mat opening closes the gap and frames the print with a clean border, which is a common way to give a 16×20 a larger, gallery-style footprint. Without a mat, a 16×20 print shifts around inside an 18×24 frame, so always include the matching mat.
The reverse does not work: an 18×24 print is too large for a 16×20 frame and would have to be cropped down, which defeats the point of a ready-to-print file. If you sell either size, naming the right frame-and-mat pairing in your listing saves buyers a search and heads off mismatched-frame refunds.
For framing details across common sizes, see the print size for frame guide.
When to Offer Each Size on Etsy
16×20 is the dependable large framed size. It fits the most common large photo frames, suits photography and art prints, and is the size buyers reach for when they want a framed focal piece without going poster-scale.
18×24 is the poster size. Its taller 3:4 proportion is made for typography, movie-style prints, bold graphic art, and anything that wants vertical drama. Buyers shopping for a poster expect 18×24 by name.
Offer both and you cover both shoppers — the one framing a 16×20 art print and the one hanging an 18×24 poster — from a single upload, with no extra design work.
Frequently Asked Questions
Yes. An 18×24 print covers 432 square inches versus 320 square inches for a 16×20 — that is 35% more surface area. Both are large statement sizes, but 18×24 is the classic poster format, noticeably taller and grander on the wall, while 16×20 fits the most common large photo frames.
16×20 is a 4:5 ratio (0.800). 18×24 is a 3:4 ratio (0.750). That 0.05 gap is bigger than it looks: 18×24 is visibly taller and narrower in proportion, which is why it reads as a poster while 16×20 reads as a framed print. The two are not interchangeable.
At 300 DPI, 16×20 needs 4800×6000 pixels (portrait) or 6000×4800 (landscape). 18×24 needs 5400×7200 pixels (portrait) or 7200×5400 (landscape). At these large sizes, 300 DPI keeps the print sharp; dropping below it shows softness the moment the piece is hung.
Yes — with a mat. An 18×24 frame with a 16×20 mat opening bridges the gap and gives the print a bordered, gallery look. Without a mat, a 16×20 print floats loosely inside an 18×24 frame, so pair it with the matching mat. A 16×20 frame cannot hold an 18×24 print — it is too large and would have to be cropped.
Not cleanly. The ratios differ (4:5 vs 3:4), so a straight scale leaves white bars and stretching distorts the artwork — and the gap here is wide enough to be obvious. Export each at its own ratio, or use a controlled, distortion-free crop to 3:4 when you specifically want the 18×24 from 16×20-ratio art.
16×20 is the dependable large framed-art size; 18×24 wins for posters, typography, movie-style prints, and bold graphic art that benefits from a taller format. They suit different products, so many top listings offer both. SnapToSize generates 16×20 in the 4:5 pack and 18×24 in the 3:4 pack from one upload.