Image processing for Amazon Merch and KDP sellers
Amazon rejects files that don't meet their exact specifications. Ratio Ready converts your designs to the right DPI, dimensions, and format so every upload is accepted the first time.
Challenges we solve
Common problems that slow down your workflow — and how Ratio Ready handles each one.
Strict Amazon image specifications
Amazon's Merch on Demand requires exact pixel dimensions and 300 DPI for every product type. One wrong setting and your upload is rejected, sending you back to resize and re-export.
Different requirements for Merch vs KDP
A t-shirt design needs different dimensions than a KDP book cover, which is different again from a phone case or tote bag. Keeping track of specs across product lines wastes time and causes errors.
Scaling designs across multiple products
When you have a winning design, you want it on every product type. But manually creating 10+ size variants of the same design is tedious work that slows your catalog expansion.
Time-consuming manual image preparation
Between resizing, DPI conversion, format changes, and quality checks, image prep for Amazon can take longer than creating the design itself. That time adds up when you're scaling to hundreds of listings.
Meet Amazon's requirements automatically
Upload once and get files formatted exactly how Amazon expects them -- no manual resizing or DPI guessing.
- Automatic 300 DPI conversion for all outputs
- Correct pixel dimensions for every product type
- PNG output with transparency support for Merch
- High-resolution output for KDP covers and interiors
- AI upscaling when source images are too small
- Batch processing for scaling across product types
- ZIP download with organized, ready-to-upload files
- REST API for automated workflows with Make.com or n8n
- No software to install -- works in your browser
- Pay-per-image credits with no monthly commitment
Your workflow with Ratio Ready
Upload your artwork
Drag and drop your designs into Ratio Ready. We accept JPG, PNG, and WebP files up to 50MB. Images with transparent backgrounds are preserved for Merch on Demand products.
Select your output settings
Choose the print size and resolution you need. Ratio Ready shows you exactly what each image will cost to process, including whether AI upscaling is needed for undersized files.
Process to Amazon's specs
One click converts your designs to 300 DPI at the correct dimensions. Each file is validated and processed in seconds, not minutes. Batch up to 25 images at once.
Download ready-to-upload files
Get a ZIP file with all your processed images organized and named. Upload directly to Amazon Merch on Demand or KDP without any additional editing or conversion.
Related guides
Print-Ready Files for Amazon
Amazon Merch, KDP, and FBA product image specs — cover sizes, bleed, and color modes.
How to Batch Resize Images for POD
Resize multiple designs at once for different Amazon product types.
DPI Explained for POD Sellers
What DPI means and why Amazon requires 300 DPI for all print products.
Get Amazon-ready images in seconds
100 free credits to process your first designs. No credit card required.