Reference & Cheatsheets
Developer-focused reference articles and cheatsheets — upload limits, MIME types, image formats, HTTP status codes, and other information you reference often.
Upload limits of major services
Compare upload limits across Gmail, Discord, Slack, WordPress, AWS S3, and more — with links to boundary-value test files.
MIME Types Reference
MIME types by category — images, documents, audio, video, archives. Useful for Content-Type configuration and upload validation.
Image format comparison (PNG/JPG/WebP/AVIF/GIF)
Compare compression, transparency, animation, and browser support of major image formats to pick the best one for each use case.
HTTP Status Codes Reference
All HTTP status codes from 1xx to 5xx — code, name, description, and typical usage in a developer-friendly cheatsheet.
How to change the WordPress upload limit
Five ways to raise the WordPress upload limit: wp-config.php, .htaccess, php.ini, functions.php, and the hosting control panel. Xserver / ConoHa WING covered.
How to use these references
DevLab's references gather information that web developers and sysadmins look up often. Bookmark them to keep the answers one click away.
Each reference page links to DevLab's threshold test files and dummy test files. Combine them with your verification work.