Image dimensions, file formats and platform specs — the numbers you check before you export.
The standard flat-rate packaging of the three US carriers in one place: USPS Flat Rate box dimensions inside and out, UPS Simple Rate cubic-inch tiers, FedEx One Rate packaging, plus a calculator that tells you which tier your box falls into.
Women's and men's size conversion in one place: US, UK and EU numbers next to the actual bust, waist, hip and chest measurements in cm and inches, plus the reason the EU number is never quite the same twice.
Standard shipping label dimensions in inches and millimeters, the carriers and printers that use each, and why 4 by 6 is the one to buy.
The official Shopify limits for product photos, video and 3D models in one table: maximum pixels, file sizes and formats, straight from the Shopify Help Center.
The image dimensions a store actually posts in one table: feed posts, Reels, Stories, pins and link previews, checked against each platform's official documentation.