CodeKit
Free online encoding, decoding & developer tools.
All processing happens locally in your browser. No data uploaded.
Built for Developers
Base64, URL, JWT, HMAC, hash digests, JSON/YAML/XML formatting, regex testing β the everyday codecs, hashes, and formatters you reach for during code review and debugging.
Composable Pipelines
Chain encode β hash β format steps into a reusable transformation pipeline. Share a single URL and the entire sequence replays in the same order.
Secrets Never Leave Your Machine
Tokens, credentials, and payloads are processed entirely in your browser. No network call, no log, no telemetry β safe to paste real JWTs and private keys for inspection.
Encoding Tools
Base64 Encode & Decode
Encode text to Base64 or decode Base64 back to text. Supports UTF-8, URL-safe variant, and batch processing.
πURL Encode & Decode
Encode or decode URL components. Handles special characters and Unicode.
πHTML Entity Encode & Decode
Encode special characters to HTML entities or decode them back.
π’Hex Encode & Decode
Convert text to hexadecimal representation or decode hex back to text.
π’Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal.
πUnicode Encode & Decode
Convert text to Unicode escape sequences (\uXXXX) or decode them back to readable text.
π¦UTF-8 Encode & Decode
Convert text to UTF-8 byte representation (hex) or decode UTF-8 bytes back to text.
π§MIME Decoder
Decode MIME encoded-word format (Base64 or Quoted-Printable) used in email headers.
Formatting Tools
JSON Formatter & Validator
Format, minify, and validate JSON data with syntax highlighting.
πText Diff
Compare two texts and highlight the differences.
πCSV β JSON Converter
Convert between CSV and JSON formats. Supports custom delimiters including comma, tab, and semicolon.
πYAML β JSON Converter
Convert between YAML and JSON formats. Supports all YAML data types and structures.
πXML Formatter
Format and minify XML documents with customizable indentation.
ποΈSQL Formatter
Format and beautify SQL queries with syntax-aware indentation. Supports MySQL, PostgreSQL, T-SQL, and more.
Crypto Tools
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text.
πHMAC Generator
Generate HMAC-SHA256 and HMAC-SHA512 signatures with a secret key.
πRSA Key Formatter
Format PEM-encoded RSA keys and certificates with proper 64-character line wrapping.
π«JWT Decoder
Decode and inspect JSON Web Tokens (JWT).
Developer Tools
Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds, with local, UTC, ISO 8601, and relative time output.
π―Regex Tester
Test regular expressions with real-time matching, capture groups, and highlighted results. Includes a quick reference for common patterns.
πUUID Generator
Generate random UUIDs (v4) and timestamp-based UUIDs (v7) individually or in bulk. Supports uppercase and hyphen-free output.
π¨Color Converter
Convert colors between HEX, RGB, HSL, and HSV formats with a live color picker. All formats sync in real-time.
πLorem Ipsum Generator
Generate placeholder text for designs and layouts. Choose paragraphs, sentences, or words, with optional classic "Lorem ipsum" opening.
βοΈMarkdown Previewer
Write Markdown and see a live HTML preview side by side. Supports GFM tables, task lists, and code blocks.
β°Cron Expression Parser
Parse cron expressions into human-readable descriptions and see the next execution times.
πPassword Generator
Generate secure random passwords with customizable length, character types, and entropy display.
π±QR Code Generator
Generate QR codes from text or URLs. Customize size, colors, and error correction level. Download as PNG.