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A privacy-first toolkit for developers - format and validate JSON, beautify SQL/HTML/CSS/JS, encode Base64/URL/HTML, decode JWTs, generate UUIDs and hashes, build regex, and convert data formats. Everything runs in your browser, no signup, no upload.
Beautify, validate, and minify JSON with sortable keys, exact error positions, and a one-click copy.
Validate JSON syntax with exact line and column for every error.
Strip whitespace from JSON to produce a single compact line.
Convert a JSON array of objects into a downloadable CSV file.
Convert JSON to well-formed XML you can paste anywhere.
Encode and decode Base64 with full Unicode and URL-safe support.
Percent-encode and decode URLs and query parameters.
Encode HTML special characters or decode entities back to text.
Beautify SQL with proper indentation, keyword casing, and line breaks.
Beautify messy HTML with proper indentation and tag breaks.
Beautify CSS with one declaration per line and consistent indent.
Format JavaScript / TypeScript in your browser with Prettier.
Beautify XML with consistent indentation and self-closing tags.
Strip whitespace and comments from CSS to ship smaller stylesheets.
Strip whitespace and comments from JS to reduce script size.
Compress HTML by removing whitespace, comments, and optional quotes.
Test JavaScript regex with live highlighting and capture group inspection.
Generate v1, v4, and v7 UUIDs in bulk - copy or download as JSON.
Decode JWT header and payload locally - never sent to a server.
Convert between Unix timestamps and human-readable dates instantly.
Build cron expressions visually with a live human-readable preview.
Pick a color and convert between HEX, RGB, HSL, OKLCH and CMYK.
Build linear and radial CSS gradients visually - pick stops, angles, then copy.
Generate Lorem Ipsum placeholder text by paragraphs, sentences, or words.
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes of text or files.
Send GET/POST/PUT/PATCH/DELETE requests with headers and JSON body.
Search every HTTP status code with description, RFC, and common causes.
Live Markdown preview with GitHub-flavored extensions and syntax highlighting.
Convert Markdown to clean, semantic HTML with one click.
Convert CSV files into JSON arrays with auto-detected types.
Convert between YAML and JSON instantly with full type support.
Generate strong, cryptographically random passwords with full character-class control.
Check password strength against length, classes, and common-password lists.
Generate bcrypt hashes and verify a password against a hash, locally.
Decode an SSL/TLS certificate (PEM) - issuer, subject, validity, SAN list.
Build a Content-Security-Policy header from a guided form - modern best practice.
Audit response headers against OWASP best-practice security checklist.
Generate a JSON Schema (draft-07) from any JSON sample.
Explore a JSON Schema as a collapsible tree with descriptions, types and examples.
Generate realistic fake JSON for tests, mocks, and seed data.
Build a mock JSON response with status, headers, and body.
Generate a curl command from URL, method, headers, and JSON body.
Build Markdown tables visually - type cells, get clean alignment.
Searchable reference of every common Markdown syntax with examples.
Compare two blocks of text and see additions, deletions, and changes.
Compare two JSON payloads and see added, removed, and changed fields.
Compare two CSVs by row and column - find new, deleted, and changed rows.
Validate YAML syntax with line/column errors and pretty-printed parse tree.
Format and validate docker-compose.yml - sort services, normalise keys.
Build a .env file from a guided form - quotes escapes & comments handled.
Browse a Postman collection v2.1 JSON as a request tree - locally.
We design and ship internal tooling, dashboards, and customer-facing utilities. Tell us what you need and we'll scope it.