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guides & tutorials.
Practical guides for developer tools — from formatting and encoding to validation and conversion.
CSS Color Formats: HEX vs RGB vs HSL vs OKLCH
Compare CSS color formats. Learn when to use HEX, RGB, HSL, or OKLCH for your web projects. Modern CSS color spaces explained.
Data URI Guide: Embed Images Directly in HTML
Learn how data URIs work. Embed images as Base64 directly in HTML and CSS. Pros and cons compared to external image files.
JSON to CSV Conversion: Tips and Best Practices
Convert JSON to CSV without data loss. Learn how nested objects flatten, handle inconsistent keys, and choose the right delimiter.
How to Compare Text Files: Diff Checker Guide
Learn how to compare two text files or strings side by side. Find additions, deletions, and changes with an online diff checker tool.
HTML Live Preview: Test and Debug HTML Online
Learn how to use an HTML live preview editor. Test HTML, CSS, and JavaScript code in real-time with a sandboxed preview. Perfect for prototyping.
HTML Entity Encoding for XSS Protection
Learn how HTML entity encoding prevents XSS attacks. Encode HTML special characters safely. Server-side vs client-side encoding best practices.
SQL Formatting Best Practices: Write Clean Queries
Learn SQL formatting best practices. How to format SELECT, JOIN, WHERE clauses for readability. Clean SQL is easier to debug and maintain.
Unix Timestamp Explained: What It Is and How to Use It
Learn what a Unix timestamp is, how it works, and why it's used in programming. Convert timestamps to dates and avoid common pitfalls.
HEX to RGB Conversion: How Color Codes Work
Understand how HEX color codes convert to RGB values. Learn the math behind hex-to-rgb conversion with practical examples for web developers.
URL Encoding 101: Special Characters and Encoding Rules
Learn how URL encoding works. Complete guide to special characters in URLs, percent-encoding rules, and when to use encodeURI vs encodeURIComponent.
Base64 vs Base64URL: What's the Difference?
Learn the key differences between Base64 and Base64URL encoding. When to use each format for JWT, data URIs, and URL-safe transmission.
UUID v4 vs v7: Which One Should You Use?
Compare UUID v4 and UUID v7. Learn when to use random UUIDs vs time-ordered UUIDs for database primary keys, APIs, and distributed systems.
Common JSON Errors and How to Fix Them
Fix the most common JSON errors: trailing commas, missing quotes, unquoted keys. Learn how to validate JSON online and debug syntax issues.
Email Regex Pattern: Validate Email Addresses Correctly
A practical guide to email regex patterns. Learn the most common regex for email validation, test patterns online, and avoid false rejections.
How to Decode a JWT Token: Step-by-Step Guide
Learn how to decode a JWT token without a secret key. Step-by-step guide to inspecting JWT header, payload, and signature using online tools.
URL Shortener: Uzun Linkleri Kısaltın, Tıklamaları Takip Edin
WhetKit URL Kısaltıcı ile uzun linkleri kısaltın, özel slug oluşturun, tıklama sayılarını takip edin ve QR kod üretin. Ücretsiz, kayıt gerektirmez.
JSON Formatter & Validator: The Complete Guide
Learn how to format, validate, and debug JSON efficiently. Covers syntax, common pitfalls, best practices, and practical examples for daily development work.
Regex Tester & Debugger: The Complete Guide
Learn how to test and debug regular expressions effectively. Covers regex syntax, flags, character classes, group capture, and lookahead/lookbehind.
SQL Formatter & Beautifier: The Complete Guide
Learn how to format and beautify SQL queries for better readability. Covers formatting rules, indentation styles, and best practices for clean SQL.
Epoch / Unix Timestamp Converter: The Complete Guide
Learn how to convert Unix timestamps to human-readable dates and back. Covers epoch time basics, seconds vs milliseconds, timezone handling, and the Year 2038 problem.
HTML Preview / Sandbox: The Complete Guide
Learn how to use an HTML preview sandbox to rapidly prototype, debug, and test HTML, CSS, and JS code in real-time with workflow tips and examples.
URL Encoder & Decoder: The Complete Guide
Learn how URL encoding works, when to use encodeURI vs encodeURIComponent, and how to handle special characters safely in URLs and API calls.
Base64 Encoder & Decoder: The Complete Guide
Understand how Base64 encoding works, explore use cases like data URIs and JWT tokens, and learn best practices for binary-to-text encoding.
UUID Generator: The Complete Guide
Explore the differences between UUID v1, v4, and v7, learn when to use each version, and understand how UUIDs impact database index performance.
JSON to CSV Converter: The Complete Guide
Learn how to convert JSON arrays to CSV with nested object flattening, custom delimiters, and practical examples for data migration and analytics.
HTML Entity Encoder & Decoder: The Complete Guide
Learn how to encode and decode HTML special characters safely. Covers named and numeric entities, XSS prevention, and practical web development examples.
JWT Parser & Inspector: The Complete Guide
Learn how to decode, inspect, and validate JSON Web Tokens. Covers header, payload, claims, signature verification, and expiration validation.
Color Converter (HEX, RGB, HSL): The Complete Guide
Learn how to convert colors between HEX, RGB, HSL, and OKLCH formats. Covers color models, conversion math, use cases, and practical examples.
Text Diff Checker: The Complete Guide
Learn how to compare text with a diff checker. Covers diff algorithms, line-by-line comparison, ignoring whitespace/case, and practical examples.
HEX to HSL Converter: The Complete Guide
Learn how to convert HEX color codes to HSL and HSLA values. Covers the conversion formula, CSS usage, color theory, and practical examples for web developers.
Base64 Image Converter: The Complete Guide
Learn how to encode images to Base64 data URIs and decode them back. Covers data URI syntax, use cases, performance considerations, and examples.