Developer tools that run on your computer — format JSON, test regular expressions, decode JWTs, encode Base64, and more. Nothing uploads. Works on bad wifi or no wifi.
Paste messy JSON — get it beautifully formatted, validated, and unescaped. Runs entirely in your browser.
On your computer · Nothing uploadsFormat or minify XML with syntax highlighting — right in your browser. Validates structure and highlights errors.
On your computer · Nothing uploadsFormat, validate, and convert YAML — right in your browser. Paste messy YAML and get it beautified with error highlighting.
On your computer · Nothing uploadsMinify HTML, CSS, and JavaScript — right in your browser. See original vs minified size with percentage reduction.
On your computer · Nothing uploadsEncode text or files to Base64, or decode Base64 back — right in your browser. Supports text and file mode.
On your computer · Nothing uploadsEncode or decode URLs and query strings — right in your browser. Uses encodeURIComponent and decodeURIComponent.
On your computer · Nothing uploadsEncode special characters to HTML entities or decode them back — right in your browser. Handles &, <, >, ", and '.
On your computer · Nothing uploadsGenerate SHA-1, SHA-256, and SHA-512 hashes from any text — right in your browser using the Web Crypto API.
On your computer · Nothing uploadsGenerate random UUID v4 identifiers — right in your browser. Generate one or many at once with one-click copy.
On your computer · Nothing uploadsGenerate strong, random passwords — right in your browser. Customize length, characters, and complexity.
On your computer · Nothing uploadsGenerate placeholder text in paragraphs, sentences, or words — right in your browser. Copy with one click.
On your computer · Nothing uploadsBuild cron expressions with a visual editor — right in your browser. See a human-readable schedule and the next execution times.
On your computer · Nothing uploadsConvert a JSON array of objects to CSV format. Handles nested keys by flattening. Download as .csv.
On your computer · Nothing uploadsConvert CSV text to a JSON array of objects. Auto-detects headers. Download as .json.
On your computer · Nothing uploadsConvert between Unix timestamps and human-readable dates. See current timestamp live.
On your computer · Nothing uploadsTest regular expressions with live matching and group highlighting. Supports global, case-insensitive, multiline, and dotAll flags.
On your computer · Nothing uploadsDecode JSON Web Tokens to inspect header, payload, and signature. Verify signatures with Web Crypto API.
On your computer · Nothing uploadsPick any color and get its HEX, RGB, and HSL values. Copy color codes with one click.
On your computer · Nothing uploadsCreate beautiful CSS gradients with live preview. Linear and radial gradients with multiple color stops.
On your computer · Nothing uploadsTurn code snippets into beautiful images. Choose themes, adjust padding, and export as PNG.
On your computer · Nothing uploadsGenerate favicons from images or text. Preview at all sizes and download as ICO or PNG.
On your computer · Nothing uploads