One design across several products, or different designs for each?

The instinct is to take the one illustration you’re proud of and put it on everything. It saves your time, it looks coherent, and it’s how a lot of first merch lines start. It also produces the classic result: the keychain is great, and the badge is an unreadable smudge of the same idea.

The short answer: reuse the design concept, not the file. Formats change what a design can show — size, transparency, cut shape, print surface — so most “one design” lines are really one concept plus a tuned file per format. Decide that before you split quantities, because the split itself depends on it.

The artwork anatomy — what stays and what changes

Think of a design as layers with different jobs. Across formats, some layers survive and some have to be redone:

Layer	What it does	Across formats
Mark / core shape	The silhouette people recognise	Keep identical — this is the recognisability
Colour palette	The line’s identity	Keep as a system: same palette, rebalanced for the surface
Type / lettering	The words	Keep the typeface; re-fit the text to each format’s size floor
Scene / detail	The illustration content	Per format — may need cropping, simplifying or dropping
Effects	Holographic, glitter, epoxy, satin	Format by format; effects are surfaces, not artwork

The rule: keep the layers that make it yours, re-fit the layers that the format physically decides. A badge that carries the same mark and palette but a simplified drawing is still “one design.” A badge that carries an uncropped sticker file is neither.

What each format changes, in one table

Format	Size & aspect	Background & transparency	Cut / shape	Risk to the artwork
Acrylic keychain	Small square-ish, ~25–75 mm	Clear base = white underbase logic; effect bases change colour	The cut-out is part of the design	Text and fine detail hit the size floor first
Sticker	Widest range; portrait or landscape freely	Printed on your choice of vinyl; clear is an option	Any outline — die-cut or kiss-cut sheet	Effect finishes bury small text; laminate glare
Fridge magnet	Mid-size, usually rectangular	Opaque print face; the back is magnetic	Shape is typically simple	Flexible magnet surface can look soft under print
Badge	The smallest canvas	Opaque metal; enamel is even more reductive	Round or presets	Detail is lost first; the picture becomes a symbol
Sticky note	Fixed print zones	Opaque paper	The pad construction, not you	The area is preset — layout, not art

The adaptation ladder

1. Reuse as-is. Only works when the format genuinely shows the same thing — typically one big bold mark moving between sticker and magnet, or between sticker and a clear keychain at a good size. If anything shrinks below its readable floor, this stops being free.

2. Tune. Same artwork, adapted file: crop to the new aspect, rebalance the palette for the new surface (dark backgrounds on light bases, colours that survive an underbase), drop effects that fight the finish, re-fit type to the size floor. This is the normal cost of a coherent line — budget the time for it, because it’s the difference between “line” and “one design, several ruins.”

3. Redraw for the format. When the format is a different medium (badge enamel, small keychain icon), keep the mark and palette, and draw a simplified version. This is what brands do — the badge is a symbol, not a thumbnail of the sticker.

Where people get hurt is jumping from 1 to 3: tuning (2) fixes most cases, and redrawing (3) is for genuinely different media, not for laziness of layout.

The line-coherence test

Before you order, ask: if these products sat together on a table, would a stranger see one line or five orphan products? If they’d see five orphans, the problem is usually abandoned layers — palette or type drifted between files — not the artwork itself. Fix the layers first, redraw second.

The mismatch has a cost beyond aesthetics: the more differently each format performs, the more you need separate artwork per format, and the more your quantities need to follow the design split — which is exactly the question that planning quantities across designs solves. If you’re still choosing which formats the line should be in at all, that decision comes first: which format fits your artwork.

Order the line, not the artwork: tell us the design count and the format list, and the quote comes back with per-format artwork questions attached — the same split that decides the production run.