Guides
The tools on this site are small and single-purpose. These pages are the reference material around them: the numbers a platform actually documents, the arithmetic behind a print size, and the sequencing that decides whether a batch of photos is usable.
Where a figure comes from a platform's own documentation, the page says so and links to it. Where it is arithmetic or a technical property rather than a policy, the page says that instead. Neither is a substitute for the platform's current help pages, which change without notice.
Marketplace rules
Etsy listing images: what the rules actually say
The 2000 px recommendation against the 635 px floor for the first photo, the five accepted formats, why transparent PNG turns black, and the 1 MB upload caveat.
Image and title limits across marketplaces
A comparison table for Amazon, eBay, Etsy, Walmart, Shopify, Google Shopping and the large Asian platforms, with the reasoning behind each recommended export size.
Resolution and format
Why dpi is a printing instruction rather than a quality score, the millimetre-to-pixel arithmetic, and why editing the dpi tag changes nothing about the image.
WebP vs JPG vs PNG: which should you use?
What each format is good at, and which one a marketplace upload form expects.
Working at volume
Processing 200 photos without 200 clicks
The order of operations that keeps a batch sharp, why browser tabs stall on large batches, and a one-minute check that catches the files that went wrong.
File naming conventions that stay sorted
Zero-padding, separators, and the naming pattern bulk-upload tools expect.
Privacy
What your photo file says about you
EXIF, GPS coordinates and camera serial numbers — what travels with a photo, and which parts survive an upload.
Every tool guide
Each tool has a companion page that goes deeper than the tool itself: what the output is good for, which choice to make, and where the limits are.
- Preparing product photos for marketplaces
- How to get a pure white product background
- What to do when an image is too big to upload
- WebP vs JPG vs PNG
- How to convert HEIC to JPG, by system
- Passport photo requirements
- EXIF and GPS explained
- File naming conventions
- Photos as a PDF
- Merging PDFs without losing what is inside
- Planning a grid post
- How to write a product title that fits
If a number on any of these pages disagrees with the platform's own help centre, the platform is right and the page needs updating. Corrections are welcome through the contact page.