Collection
Developer
Diagram, format, diff, decode — the everyday developer bench. 23 tools, free, no sign-up, nothing uploaded.
Mermaid Studio
Write Mermaid diagrams, preview live, export PNG/SVG, and share with a link.
JSON Formatter
Format, validate, and minify JSON with live error checking and one-click download.
Color Picker & Converter
Pick colors and convert HEX, RGB, HSL and OKLCH, check WCAG contrast, build palettes, and grab a color from an image.
Code Compare
Compare two code snippets or files with a clear, color-coded diff, side-by-side or unified.
Base64 & URL Encoder/Decoder
Encode and decode text with Base64 or URL encoding instantly, entirely in your browser.
Regex Tester
Test, debug, and validate regular expressions with live match highlighting, captured groups, and flags.
JWT Decoder & Verifier
Decode a JSON Web Token to read its header, payload, and claims, check expiry, and verify the signature — entirely in your browser.
UUID, ULID & Nanoid Generator
Generate UUIDs (v1, v4, v7), ULIDs, and nanoids in bulk — copy or download them, entirely in your browser.
Case Converter
Convert text between camelCase, snake_case, kebab-case, Title Case, CONSTANT_CASE, and more — instantly, as you type.
Slug Generator
Turn any title or text into a clean, URL-safe slug — with transliteration, custom separators, and batch mode.
Sitemap.xml Generator
Build a valid XML sitemap — add or paste URLs, set change frequency, priority, and last modified date, validate for errors and duplicates, and download sitemap.xml.
HTML Entity Encoder / Decoder
Encode and decode HTML entities, and escape or unescape special characters like < > & " — instantly in your browser.
Cron Expression Generator
Build and understand cron schedules — plain-English explanations, the next run times, and a field-by-field breakdown.
Unix Timestamp Converter
Convert Unix/epoch timestamps to human dates and back — seconds, milliseconds, micro/nanoseconds, any time zone, with the live current time.
SQL Formatter & Minifier
Format, beautify, and minify SQL for Postgres, MySQL, SQLite, and more — with keyword case and indent controls.
Lorem Ipsum & Fake Data Generator
Generate lorem ipsum placeholder text and realistic fake data — names, emails, addresses, and JSON or CSV fixtures.
Data Format Converter
Convert between JSON, YAML, XML, and CSV — a dedicated page for every conversion, all in your browser.
JSON to CSV Converter
Convert JSON to CSV in your browser — paste JSON or drop a file, flatten nested objects, choose delimiter and quoting, and download the CSV. Nothing uploaded.
CSV to JSON Converter
Convert CSV to JSON in your browser — paste CSV or drop a file, pick the delimiter and headers, preview the table, and download the JSON. Nothing uploaded.
IP Checker
See your public IPv4/IPv6 address, ISP, ASN, and approximate location, or look up any other IP address — nothing leaves your browser except the address itself.
JSON to TypeScript, Go & Zod
Turn a JSON sample into TypeScript interfaces, Go structs, or a Zod schema — instantly, in your browser.
Code Beautifier & Minifier
Beautify or minify HTML, CSS, and JavaScript — powered by Prettier, Terser, and CSSO, all in your browser.
CSS Generators
Generate CSS gradients, box-shadows, glassmorphism, border-radius, text-shadows and cubic-bezier easing — with a live preview, in your browser.