Developer tools
that stay private
All processing happens in your browser. Paste sensitive tokens, JSON configs, or credentials - nothing leaves your machine.
Available Tools
JSON Formatter
Format, beautify, and validate JSON data. Supports RFC 8259 with precise line/column error reporting.
JWT Decoder
Decode JSON Web Tokens client-side. Inspect header, payload, and claims - without exposing your secret.
Base64 Encode/Decode
Live two-way Base64 converter. Full UTF-8 support - handles emoji and international characters correctly.
Base64URL Encode/Decode
URL-safe Base64 encoding using - and _ instead of + and /. Perfect for JWT and URL parameters.
JSON to TypeScript
Generate TypeScript interfaces from any JSON object. Handles nested objects, arrays, and optional fields automatically.
JSON to CSV
Convert a JSON array of objects to CSV. RFC 4180 compliant - handles commas, quotes, and custom delimiters.
CSV to JSON
Convert CSV data to a JSON array. RFC 4180 parser with optional type inference for numbers and booleans.
JSON to YAML
Convert JSON to clean, human-readable YAML 1.2. Perfect for Kubernetes, Docker Compose, and GitHub Actions.
YAML to JSON
Convert YAML configuration files to JSON. Supports anchors, aliases, and custom indentation.
JSON Schema Generator
Generate a JSON Schema Draft-07 from sample JSON. Infers types, formats (date, email, UUID), and required fields.
JSON Diff / Compare
Compare two JSON objects side-by-side. Color-coded diff highlights added, removed, and changed keys recursively.
Image to Base64
Drag and drop any image to encode it as a Base64 data URI. Full data URI or raw Base64 output with one click.
Base64 to Image
Paste a Base64 data URI or raw Base64 string to render and preview the image, then download it.
JWT Generator
Build and sign HS256 JSON Web Tokens with a custom payload and secret - all via the Web Crypto API.
JWT Verifier
Verify HS256 JWT signatures with your secret key. Confirms authenticity using the Web Crypto API - no server calls.
Base32 Encode/Decode
Convert plain text to Base32 or decode Base32 to text online. Supports standard RFC 4648 and Base32Hex alphabets.
Base58 Encode/Decode
Convert plain text to Base58 or decode Base58 to plain text online. Uses the Bitcoin standard alphabet.
ROT13 / ROT47 Cipher
Obfuscate and decode text using character rotation ciphers. Supports letter shift (ROT13) and full ASCII shift (ROT47).
Punycode Converter
Convert domain names between Unicode and ASCII Punycode (xn--). Essential for Internationalized Domain Names (IDNs).
Quoted-Printable Encode/Decode
Convert plain text to Quoted-Printable (QP) format or decode QP to plain text online. Compliance with RFC 2045.
SQL to JSON Converter
Convert SQL INSERT INTO queries to structured JSON. Processes database dumps and multi-row records client-side.
Query String to JSON
Convert URL query parameters to JSON objects or stringify JSON into query parameters. Supports nested brackets and arrays.
Your data never leaves your browser
Every tool runs entirely in JavaScript, locally. Open your network tab and watch - zero requests.
No accounts, no logs
No sign-up required. No server logs. Paste sensitive credentials with confidence.
Always fast, always available
No server roundtrips means instant results. Works offline once the page is loaded.