Already rejected
The Merch by Amazon 25 MB limit
Nothing is wrong with your artwork. Two of the platform's own rules are in direct conflict.
Where the conflict is
Merch requires dimensions of exactly 4500 × 5400 pixels — one pixel off is a refusal — and a file no larger than 25 MB. A 32-bit transparent PNG at that size, carrying any gradient, grain or photographic element, typically exports between 30 and 60 MB. Shrinking the canvas is not available to you: the dimensions are mandatory.
Batch, auto-fix and exports
Checking one file at a time is free and always will be. Batch checking up to 100 files, one-click exports sized for every platform, and CSV reports are part of Seller.
Exports are padded and centred to each platform's size on a transparent canvas. Nothing is ever upscaled — a file enlarged to pass a dimension check still prints soft, which is the failure this tool exists to prevent.
Try these in order
- Re-encode (offered by the tool on this page) — strips metadata and re-runs PNG compression without moving a single pixel. This alone is usually enough.
- Reduce the colour count — quantising to a 256-colour palette cuts size dramatically but changes how gradients step. Fine for flat illustration, wrong for photographic work.
- Simplify gradients and grain — PNG is lossless, so random noise is expensive to store. Removing decorative texture often halves the file.
- Trim large semi-transparent areas — edge anti-aliasing is necessary, but broad alpha fades destroy compression efficiency.
Frequently asked questions
Can I submit a JPEG instead?
No. JPEG has no alpha channel, so the background becomes solid white or black and prints as a box on a dark garment.
My design is only a few flat shapes. Why is the file still huge?
Check whether it was saved as 32-bit PNG with large semi-transparent regions on the canvas. Some export tools also embed colour profiles and preview thumbnails, which a re-encode strips out.