Developer Tools
Interactive tools for everyday developer tasks.
Base64 Encoder & Decoder
Encode text to Base64 and decode Base64 back to text with UTF-8 support. Handles Unicode characters correctly using TextEncoder and TextDecoder APIs.
EncodingBig-O Complexity Visualizer
Visualize and compare algorithm time complexities like O(1), O(log n), O(n), O(n log n), and O(n²). Plot growth curves to understand performance scaling at a glance.
AlgorithmsWCAG Color Contrast Checker
Calculate WCAG 2.1 color contrast ratios between foreground and background colors. Verify AA and AAA compliance levels for normal and large text accessibility.
AccessibilityCSS Flexbox Playground
Interactively test CSS flexbox container and item properties with a live preview. Adjust justify-content, align-items, flex-direction, and flex-grow to see layout changes.
CSSCSS Grid Playground
Experiment with CSS grid layout properties interactively. Define columns, rows, gaps, and areas while watching the grid template update in a live visual preview.
CSSCSS Specificity Calculator
Calculate CSS selector specificity scores using the standard (a, b, c) notation. Enter any selector and see its inline, ID, class, and element contributions instantly.
CSSDOM Event Propagation Visualizer
Visualize DOM event capturing, targeting, and bubbling phases in real time. Toggle stopPropagation and stopImmediatePropagation to see how events traverse the tree.
WebSHA-256 Hash Generator
Generate SHA-256 cryptographic hashes from text input using the Web Crypto API. Compare hashes and verify data integrity with hexadecimal digest output.
SecurityHTTP Request Builder & cURL
Build HTTP requests with method, URL, headers, and body, then generate the equivalent cURL command. Supports GET, POST, PUT, DELETE, and PATCH with custom headers.
WebHTTP Status Code Explorer
Browse and explore HTTP status codes with their meanings, categories, and common use cases. Search by code or description to understand 1xx through 5xx responses.
WebJSON Formatter & Validator
Format, beautify, and validate JSON data with configurable indentation. Instantly catches syntax errors and displays a pretty-printed tree structure.
Data FormatJSON Schema Validator
Validate JSON data against a JSON Schema definition and get detailed error reports. Supports type checking, required fields, and common constraint validation.
Data FormatJWT Token Decoder
Decode JSON Web Token (JWT) headers and payloads safely in the browser. Inspect expiration, issuer, and claims without sending tokens to any external server.
SecurityMarkdown Live Preview
Render Markdown to HTML in real time with a live preview pane. Supports headings, lists, code blocks, links, emphasis, and blockquotes for documentation drafting.
Text ProcessingRegular Expression Tester
Test regular expressions against sample text with live match highlighting, capture group extraction, and flags support for global, case-insensitive, and multiline modes.
Text ProcessingText Diff Comparison
Compare two text blocks line by line and visualize the differences with added, removed, and unchanged lines highlighted. Useful for reviewing changes and patches.
Text ProcessingUnix Timestamp Converter
Convert between Unix timestamps and human-readable dates in both directions. Supports seconds and milliseconds, with UTC and local timezone display options.
Date & TimeUnicode Code Point Explorer
Explore Unicode code points of any text input. View each character with its code point, UTF-8 byte sequence, and official name for internationalization debugging.
Text ProcessingURL Encoder & Decoder
Encode and decode URLs and their components safely. Switch between encodeURIComponent and encodeURI modes to handle query parameters, paths, and special characters.
Text ProcessingUUID v4 Generator
Generate cryptographically random UUIDs version 4 using the Web Crypto API. Produce single or batch UUIDs with optional uppercase formatting and copy-to-clipboard support.
Data Generation