GUIDES / INDEX

Know the rules
before the review does.

23 guides on shipping software: store specs, formats, accessibility and the syntax people copy wrong. Written from our own submissions.

Stores & Launch

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SIZES App Store screenshot sizes, 2026 Every required and optional slot, and which uploads double for others. → SIZES Play Store asset sizes, 2026 Screenshots, the feature graphic, and the icon Google actually wants. → REVIEW Why screenshots get rejected The rules reviewers actually enforce, with real rejection examples. → ASO Screenshot copywriting that converts What the first two screenshots must say, and what to leave out. → ICONS App icon sizes for iOS and Android The full matrix, adaptive icons, and the alpha channel trap. → CHECKLIST Store listing checklist Everything to verify before you press submit, both stores. → SIZES iPhone screenshot sizes, per device One required size, three optional, and how to capture natively. → SIZES iPad screenshot sizes 13 inch and 12.9 inch specs, landscape rules, iPad only gotchas. → REVIEW Why app submissions get rejected The guideline numbers that come back most often. → ASO ASO fundamentals Which text fields each store indexes, and what to change first. → TESTING A/B testing store listings What is worth testing, and how to read the result. → LOCALE Localizing screenshots Which markets pay off, and a workflow that scales. → VIDEO App preview video specs Length, resolution and the poster frame. →

Web & Brand

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WEB OG image sizes that work everywhere One file, every platform, and the safe area to keep text inside. → WEB Favicon formats explained Which files a browser actually asks for, and why .ico survives. → COLOUR Choosing an accessible palette Contrast ratios, AA vs AAA, and pairing colours that pass. →

Images & Media

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FORMATS HEIC on Windows, fixed Why iPhone photos will not open, and three ways to convert them. → FORMATS GIF vs WebP vs APNG File size, quality and compatibility, with real numbers. →

Documents & PDF

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DOCUMENTS Sign a PDF without an account Draw, type or upload a signature and keep the file on your machine. → DOCUMENTS Compress a PDF for email Hit a 10 MB cap without turning the text to mush. →

Developer & Data

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REGEX Regex flavors, JS vs PCRE Lookbehind, named groups, and why one engine can hang. → AUTH JWT security basics What decoding does not prove, and where to store a token. → CRON Cron syntax by example Real schedules decoded field by field, plus the OR trap. →