Guides and how-tos on DNS, image formats, encoding, password security, data formats and web tools.
A step-by-step way to figure out whether a site is down for everyone or just for you, and what each result actually tells you.
JSON, XML and CSV each solve a different problem. Here is how to pick the right one, plus tools to convert and validate between them.
What actually makes a password hard to crack, why length beats complexity, and how sites store passwords safely using hashing.
Base64 encoding turns binary data into plain text so it survives systems built for text. Here is what it is for, and what it is not for.
A plain-language comparison of PNG, JPG and WebP, with rules of thumb for choosing the right one and tools to convert between them.
What A, AAAA, MX, TXT and CNAME records actually do, in plain language, with the tools to check any domain's records in seconds.
Learn how to check DNS records for any domain using a DNS lookup tool. Step-by-step guide with tips, fixes, and a fast online solution.