Useful explanations, not just tools
Learn how common web formats and utilities work, avoid frequent mistakes, and get more reliable results from our browser-based tools.
How to Format and Validate JSON
Learn how to format, validate, and troubleshoot JSON with practical examples of the syntax errors developers encounter most often.
EncodingBase64 Encoding Explained
Understand what Base64 encoding does, why it increases data size, how to recognize it, and when it should not be used.
Web DevelopmentURL Encoding and Percent-Encoding
Learn when URLs need percent-encoding, how spaces and Unicode are represented, and why encoding an entire URL can produce broken links.
Time & DatesUnix Timestamps Explained
Understand Unix time, seconds versus milliseconds, UTC conversion, time zones, and the timestamp mistakes that cause incorrect dates.
SecurityHow to Decode JWT Tokens Safely
Learn what a JWT contains, what decoding can and cannot prove, and how to inspect token claims without exposing credentials.
SecuritySHA-1 vs SHA-256 vs SHA-512
Compare common SHA hash functions, understand what a digest proves, and choose an appropriate method for checksums and passwords.
TextRegular Expressions for Beginners
Build regular expressions step by step, understand groups and quantifiers, and avoid patterns that match more—or less—than intended.
Color & CSSHEX, RGB, and HSL Color Formats
Understand how HEX, RGB, and HSL represent color, convert between them, and choose a format that makes CSS easier to maintain.