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Free online API Client and Request Builder. Send HTTP requests with all methods (GET, POST, PUT, PATCH, DELETE), manage headers, auth (Bearer, Basic, API Key), request body (JSON, form-data, GraphQL), inspect responses, generate code snippets, and test REST & GraphQL APIs instantly.

Free online JWT Decoder and Security Analyzer. Decode JWT tokens, inspect header & payload, verify signature, check expiration, validate claims, and detect security risks like alg:none, tampering, and sensitive data exposure.

Encode and decode URLs instantly. Convert special characters into URL-safe format and decode encoded URLs back to readable text.

Parse and validate cron expressions. See a human-readable description, next 8 scheduled run times, and use common presets instantly.

Generate SEO meta tags (title, description, Open Graph, Twitter Cards) for any page.

Compare two texts and highlight the differences line by line, word by word, or character by character. Export as .patch file.

Convert Markdown to clean HTML and HTML back to Markdown instantly - live preview, syntax highlighting, copy/export tools, and formatting support in one professional editor.

Calculate percentages instantly - find % of a number, percentage change, add or subtract %, and score grading. Includes history.

Convert Unix timestamps to human-readable dates and vice versa. Shows UTC, local time, ISO 8601, relative time, week number and more.

Convert colors between HEX, RGB, HSL, HSV and CMYK formats instantly. Includes a color picker, swatch library, and one-click copy for every format.

Test, debug and build regular expressions in real time. Highlights matches, shows groups, supports replace, and includes common pattern shortcuts.

Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text or files. Uses WebCrypto API - nothing leaves your browser.

Format, validate and minify JSON instantly. Paste raw or minified JSON to beautify it with proper indentation. Supports large payloads.

Generate QR codes from any text, URL, email, or data. Customize colors, size, error correction level and download as PNG, SVG or JPEG.

Generate placeholder Lorem Ipsum text for web design, UI mockups, and development projects.

Convert blog titles or headings into clean, SEO-friendly URL slugs. Great for WordPress, Shopify, and any CMS.

Encode or decode Base64 strings instantly. Supports text, URL-safe, file, image, audio, video, hex, JSON, HTML, UTF-8 and JWT modes.

Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more with one click.

Generate strong, secure, random passwords. Customize length and character types for maximum security.

Count words, characters, sentences, and paragraphs instantly. Perfect for essays, articles, and social media posts.