Developer Tools
Free online tools to speed up your development workflow. No sign-up, no paywall — everything runs in your browser.
All tools
JSON Formatter & Validator
Format, validate, and minify JSON instantly with syntax highlighting and precise error detection.
QR Code Generator
Generate QR codes for URLs, text, email, and more. Choose size and error correction. Download as PNG.
GUID / UUID Generator
Generate cryptographically secure UUID v4 identifiers. Bulk generate up to 20. Four output formats.
Date Calculator
Calculate the difference between two dates or add and subtract days, weeks, months, and years from any date.
Password Generator
Generate cryptographically secure passwords with custom length, character sets, and strength indicator.
Lorem Ipsum Generator
Generate placeholder text as paragraphs, sentences, or words. Output as plain text, HTML, or Markdown.
Regex Tester
Test and debug regular expressions live. Highlights all matches, shows capture groups and named groups. Supports g, i, m, s flags.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to plain text. Supports standard and URL-safe variants.
JWT Decoder
Decode JSON Web Tokens to inspect header, payload, and claims. Shows expiry and timestamp details. Token never leaves your browser.
Barcode Generator
Generate barcodes in Code 128, EAN-13, EAN-8, UPC-A, and Code 39 formats. Download as SVG — free, no sign-up, runs in your browser.
HTML Beautifier
Format and prettify HTML instantly. Configure indent size, line wrap length, and newline preservation. Runs entirely in your browser.
Diff Checker
Compare two text blocks and highlight line-by-line differences. Toggle between inline and side-by-side views. Copy as a standard patch file.
YAML ↔ JSON Converter
Convert YAML to JSON or JSON to YAML instantly. Pretty-print or minify output. Runs entirely in your browser.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files. All hashes shown at once. Runs entirely in your browser.
URL Encoder / Decoder
Encode or decode URLs and URL components using encodeURIComponent, encodeURI, and decodeURIComponent. Zero dependencies, runs in your browser.
Cron Expression Generator
Build cron expressions with a visual editor or type them manually. See a human-readable description and the next 5 run times in your local timezone.