TL;DR — The practical sizes to know are the ones with off-the-shelf frames: 11×14, 16×20, 18×24 and 24×36 inches (and A-sizes A3, A2, A1 in metric countries). Original Belle Époque posters were often far larger and in odd proportions, so a modern print is usually sized to a standard frame rather than the original. This guide maps the sizes and their uses.
By Found Poster · Published October 2026
Standard frame sizes worth knowing
Off-the-shelf frames cluster around a handful of sizes: 11×14, 16×20, 18×24 and 24×36 inches in the US and UK, and the A-series — A3 (297×420mm), A2 (420×594mm), A1 (594×841mm) — in metric countries. Sticking to these keeps framing cheap and easy.
An odd size means a custom frame, which can cost several times more than a standard one. Unless a piece truly demands it, sizing to a standard frame is the sensible default.
Why originals were a different shape
Original French posters followed printers’ sheet sizes — names like colombier and grand-aigle — and were often tall and narrow, or very large, to suit the hoarding and the Morris column. Those proportions rarely match a modern off-the-shelf frame exactly, which is why a reproduction is generally sized and, if needed, matted to fit a standard frame while keeping the image’s proportions intact.
Matching size to proportion
Some designs are square-ish, others tall and slim; the mat does the reconciling. A tall Mucha panel, for instance, can be centred in a larger standard frame with a generous mat, preserving its proportions without a custom size. When in doubt, choose the frame that fits the image’s shape most closely and let an acid-free mat make up the difference.
A quick reference
As a rule of thumb: 11×14 for a small nook or a grouped set; 16×20 as the everyday single-wall size; 18×24 for a bit more presence; 24×36 for a feature wall. Match the size to the room and the viewing distance — covered more fully in the sizing guide earlier in this series — and keep to standard frames wherever you can.
Each file in the archive notes the standard sizes it prints and frames cleanly at. Browse the archive →
Frequently asked questions
What are the most useful standard sizes?
11×14, 16×20, 18×24 and 24×36 inches (or A3, A2, A1 in metric countries) — the sizes with cheap, off-the-shelf frames.
Why don’t reproductions match the original sizes?
Original posters used printers’ sheet sizes, often tall or very large, that rarely fit modern frames; a reproduction is sized, and matted if needed, to a standard frame while keeping its proportions.
How do I frame a tall, narrow poster?
Centre it in the nearest larger standard frame with a generous acid-free mat, which preserves the proportions without the cost of a custom size.
Further reading
Found Poster restores Belle Époque and Art Nouveau posters from museum archives into archival-quality files you print yourself. Browse the archive · How to print & frame.
