Merch by Amazon Design Specs & Listing Checklist (2026 Edition)

Bookmark this. It's every technical spec and listing rule you need before hitting upload — get one wrong and you waste a slot, get them all right and your listing indexes properly from day one.

Design File Specs

| Spec | Value | |---|---| | Canvas size | 4500 × 5400 pixels | | Resolution | 300 DPI | | Format | PNG-24 | | Background | Transparent | | Color space | RGB | | Max file size | 25 MB |

Common mistakes:

72 DPI exports — looks fine on screen, prints blurry. Always export at 300 DPI.
White background instead of transparent — prints a visible white box on dark shirts.
Design touching canvas edges — leave breathing room; the full canvas prints.
Tiny text — anything that's hard to read at thumbnail size won't sell. Test your design at 100px wide.

Pro tip: If you generate art with AI (Ideogram is best for text-heavy designs), upscale to full resolution with a free tool like Upscayl, then vectorize with Vectorizer.ai if you need to recolor for multiple shirt variants.

Title Structure That Indexes

Amazon indexes your title heavily. Structure it as:

[Main niche keyword] + [design style/angle] + [product noun]

Example: Dog Mom Era Retro Floral Design For Dog Lovers

Rules:

Front-load the niche keyword — it carries the most weight
50–60 characters is the sweet spot
No ALL CAPS, no special characters, no "t-shirt" (Amazon appends the product type)
Never include trademarked phrases — when in doubt, search USPTO TESS first

Bullet Points (Max 250 Characters Each)

You get two bullets. Use them for buyer intent, not feature lists:

Bullet 1 — Who it's for + occasion: "Perfect gift for dog moms on Mother's Day, birthdays, or Christmas. Great for dog lovers, rescue parents, and anyone whose dog runs the house."
Bullet 2 — Use case + style: "Funny retro design for casual wear, dog park trips, and matching with your pup. Pairs with jeans, leggings, or pajama bottoms."

Keywords in bullets index too — naturally work in synonyms you couldn't fit in the title (puppy, fur mama, rescue dog).

Pre-Upload Checklist

[ ] Canvas is exactly 4500 × 5400 px, 300 DPI, transparent PNG
[ ] Design readable at thumbnail size
[ ] Tested on both light AND dark shirt previews
[ ] Title front-loads the niche keyword, under 60 chars
[ ] No trademarked words in title, bullets, or design (check restricted keywords)
[ ] Both bullets written for buyer intent with synonym keywords
[ ] Price set competitively for your tier ($15.99–$19.99 starts ranking faster than $24.99)
[ ] Niche validated with BSR before designing — here's how

Seasonal Timing

One spec sellers forget: timing is part of the listing. Designs need 4–10 weeks before an event to index and rank. Christmas and Halloween need ~75 days of lead; Mother's Day and Father's Day ~60. Check the Seasonal Upload Calendar to see which windows are open right now.