Developer Tools — Free, In Your Browser

All developer tools

• Password Generator — Generate strong, random passwords with a cryptographically secure generator.
• QR Code Generator — Create QR codes for links, text and more - download as PNG or SVG.
• JSON Formatter — Format, validate and minify JSON with clear error messages.
• Base64 Encoder — Encode text or files to Base64 - Unicode-safe, right in your browser.
• Base64 Decoder — Decode Base64 strings back into readable text.
• URL Encoder — Percent-encode text so it's safe to use in URLs and query strings.
• URL Decoder — Turn percent-encoded URLs back into readable text.
• UUID Generator — Generate one or hundreds of version-4 UUIDs with formatting options.
• JSON Validator — Check JSON validity with clear error line numbers.
• JSON Minifier — Strip whitespace from JSON for the smallest payload.
• XML Formatter — Pretty-print XML with consistent indentation.
• XML Validator — Check XML well-formedness with detailed errors.
• HTML Formatter — Beautify messy HTML with Prettier-quality output.
• HTML Minifier — Strip comments and whitespace from HTML.
• CSS Formatter — Beautify CSS with Prettier-quality formatting.
• CSS Minifier — Compress CSS by stripping comments and whitespace.
• JavaScript Formatter — Format JS/JSX with the real Prettier engine.
• JavaScript Minifier — Minify JS with Terser - the real production minifier.
• SQL Formatter — Format SQL queries with uppercase keywords and clean indentation.
• YAML Formatter — Re-indent and normalize YAML documents.
• YAML Validator — Check YAML syntax - catch indentation errors fast.
• YAML ↔ JSON — Convert YAML to JSON and JSON to YAML.
• XML ↔ JSON — Convert XML to JSON and JSON back to XML.
• CSV ↔ JSON — Convert CSV to a JSON array and JSON back to CSV.
• CSV ↔ XML — Convert CSV rows to XML elements and back.
• Markdown Editor — Write Markdown with a live side-by-side preview.
• Markdown Preview — Paste Markdown, see exactly how it renders.
• Markdown to HTML — Convert Markdown into clean HTML markup.
• HTML to Markdown — Turn HTML back into tidy Markdown.
• JWT Decoder — Decode JWT header and payload, with expiry check.
• JWT Generator — Create HS256-signed test JWTs from any payload.
• UUID Validator — Check UUID format, version and variant.
• SHA1 Generator — Compute SHA-1 hashes of any text.
• SHA256 Generator — Compute SHA-256 hashes of any text.
• SHA512 Generator — Compute SHA-512 hashes of any text.
• MD5 Generator — Compute MD5 hashes for checksums and legacy systems.
• HMAC Generator — Compute keyed HMAC signatures (SHA-1/256/512).
• Barcode Generator — Create Code 128, EAN-13, UPC and Code 39 barcodes as SVG.
• Regex Tester — Test regular expressions live with matches and groups.
• Cron Generator — Build cron expressions with presets and plain-English descriptions.
• Unix Timestamp Converter — Convert Unix timestamps to dates and dates to timestamps.
• Unix Timestamp Generator — The current Unix timestamp, live and one click to copy.
• MIME Type Lookup — Find the MIME type for any file extension, and vice versa.
• HTTP Status Lookup — What every HTTP status code means, searchable.
• Color Converter — Convert colors between HEX, RGB and HSL with live preview.
• Number System Converter — Convert between binary, octal, decimal and hex instantly.
• Lorem Ipsum Generator — Generate placeholder text by paragraphs, sentences or words.
• Random String Generator — Cryptographically random strings with custom character sets.
• Random Number Generator — Random integers in any range - with a no-repeats option.
• Password Strength Checker — Rate password strength with entropy and specific weaknesses.