ToolKit includes 15+ everyday developer tools, all running 100% client-side with no data uploads. Click a tool below to jump straight to it.
JSON Formatter
Online JSON formatter, beautifier, minifier and validator. Supports nested objects, arrays and Unicode escapes, minifies JSON to a single line, and pinpoints syntax errors by line number. Great for API debugging, config file editing and data cleaning.
XML Formatter
Online XML formatter, beautifier, minifier and validator. Handles indentation and namespaces automatically, escapes and unescapes XML strings, and recursively parses nested escaped JSON strings. Great for SOAP API debugging and SVG editing.
SQL Formatter
Online SQL formatter, beautifier and minifier. Supports MySQL, PostgreSQL, Oracle and SQL Server dialects with automatic keyword uppercasing and aligned indentation, and can compress long SQL into one line. Great for database development and SQL tuning.
JWT Decoder & Encoder
Online JWT (JSON Web Token) decoder that parses Header and Payload, showing expiry time and signature algorithm. Can also sign new tokens with HS256 β no jwt-cli needed. Great for OAuth 2.0 debugging, SSO development and API auth testing.
Base64 Encode & Decode
Online Base64 encoder and decoder with full UTF-8 support. Encode any string to Base64 or decode Base64 back to plain text. Great for data transfer, Data URL generation and email attachment encoding.
Image to Base64
Online image to Base64 Data URL converter supporting PNG, JPG, GIF, WebP and SVG. Embed images directly into HTML/CSS to reduce HTTP requests β perfect for inlining small icons and embedding email images.
Base64 to Image
Online Base64 to image converter. Paste a Base64 or Data URL string to preview the image instantly and download it as a file. Great for validating Base64 image data and extracting embedded image resources.
Text Diff Checker
Online text diff tool that compares two texts line by line and character by character, marking deletions in red and additions in green. Compare code, config files and document versions in the browser β no diff software required.
Regex Tester
Online regex tester and debugger supporting global, ignore-case and multiline flags, with real-time highlighting of all matches and capture group inspection. Supports JavaScript regex syntax β great for form validation, data extraction and replacement testing.
URL Encode & Decode
Online URL encoder (percent-encoding) and decoder with UTF-8 support. Great for building query strings, encoding API request URLs, and parsing QueryString parameters.
Timestamp Converter
Online Unix timestamp to date converter supporting both second and millisecond precision, displaying local time, UTC time and ISO 8601 formats. Grab the current timestamp in one click β great for log analysis, cron jobs and API debugging.
UUID GUID Generator
Online UUID v4 batch generator with standard, uppercase, braces and no-dash output formats. Generate up to 100 unique identifiers at once β great for database primary keys, distributed IDs and session tokens.
Hash Calculator
Online hash calculator supporting MD5, SHA-1, SHA-256, SHA-384 and SHA-512. Compute hashes of any text in real time β great for file checksums, password hashing, data integrity verification and digital signatures.
Cron Expression Parser
Online Cron expression builder and parser supporting standard 5-field and optional 6-field (with seconds) syntax. Translates Cron into a readable description and computes the next run times. Great for scheduling, Quartz and Linux crontab debugging.
QR Code & Barcode Generator
Online QR code and barcode generator. Turn text, URLs or WiFi credentials into a QR code, or generate a CODE128 barcode. Custom sizes, one-click PNG download, and automatic local history. Great for payments, product labels and sharing.
