Developer Tools

Record your screen online for free. Capture screen, window, or browser tab with optional microphone. Download WebM - no upload, no signup.

Scientific calculator, unit converter, programmer calculator and date calculator - all in one powerful tool. Evaluate expressions, convert units, work with binary/hex, and calculate dates.

Format, validate and beautify JSON online. Pretty print with customizable indentation, minify, and catch syntax errors instantly.

Generate random UUID v4 identifiers. Create single or bulk UUIDs with format options: dashes, uppercase, lowercase.

Encode text to Base64 or decode Base64 back to text. Supports file-to-Base64 conversion with drag and drop.

Generate URL-friendly slugs from any text. Supports Unicode transliteration (Polish, German, French and more), custom separators and max length.

Convert colors between HEX, RGB, and HSL formats. See a live preview swatch and use the native color picker for visual selection.

Encode or decode URL components online. Convert special characters to percent-encoded format or decode them back to readable text.

Convert Unix timestamps to human-readable dates and vice versa. See local time, UTC, and ISO 8601 format with a live clock.

Test regular expressions in real-time with highlighted matches, capture groups, and common pattern presets. Supports g, i, m, s flags.

Write Markdown and see the rendered preview in real-time. Split-pane editor with copy HTML output. Supports headings, bold, italic, links, lists, and more.

Convert Markdown to a downloadable PDF online. Preview your document and export a real PDF with selectable text - free, instant, in your browser.

Generate SHA-1, SHA-256, and SHA-512 hashes from any text using the Web Crypto API. Real-time hashing with copy buttons.

Generate strong, random passwords with customizable length, character sets, and entropy-based strength indicator. Uses cryptographic randomness.

Generate colorful placeholder images with custom dimensions, text overlay, grayscale, and blur. Download as PNG. No external services needed.

Convert JSON to YAML and YAML to JSON online. No external libraries - runs entirely in your browser with instant results.

Detect your screen resolution, viewport size, device pixel ratio, color depth, orientation, and touch support. Live updates on resize.

Create beautiful CSS gradients visually. Choose colors, direction, and type (linear, radial, conic). Copy the CSS code with one click.