CodingTool

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Toolkit, online.

Free, fast, and practical developer tools that run instantly in your browser. JSON, encoding, hashing, time, and more.

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52+Free tools
7Categories
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Convert

9 tools
YAML ⇄ JSON Converter
Convert between YAML and JSON
CSV ⇄ JSON Converter
Convert between CSV and JSON
XML ⇄ JSON Converter
Convert between XML and JSON formats
JSON to TypeScript
Generate TypeScript interfaces
String Case Converter
Convert text case formats
Unit Converter
Developer-focused unit converter for data sizes, rates, time, and more
Number to Words Converter
Convert numbers to words in English and Indonesian with currency and check writing support
XML to Java Class Converter
Convert XML to annotated Java classes with JAXB & Lombok support
Image to WebP Converter
Convert images to WebP format instantly in your browser

Format

9 tools
JSON Formatter
Format and beautify JSON data
JavaScript Beautifier & Minifier
Format or minify JavaScript
CSS Beautifier & Minifier
Format, optimize, and minify CSS code
HTML Beautifier & Minifier
Format, optimize, and minify HTML code
Markdown Editor & Previewer
Live markdown editor with preview
CSV Editor
Edit CSV files like a spreadsheet
Currency Formatter
Format currency values
Array Sorter & Shuffler
Sort and shuffle arrays and objects
YAML Viewer
View, parse, and validate YAML with tree view

Compare

4 tools
Code Diff Checker
Compare code/text side-by-side
JSON Diff Checker
Spot every change between two JSON objects instantly
CSV Diff Checker
Compare two CSV files with key-based diff and field-level change detection
ENV Diff Comparator
Compare, audit & merge .env files with secret detection

Encode/Decode

6 tools
Base64 Encoder/Decoder
Encode and decode Base64 strings online
URL Encoder/Decoder
Encode and decode URLs safely
HTML Escape / Unescape
Encode and decode HTML entities online
JWT Decoder
Decode JWT tokens
ZIP with Password
Compress & encrypt files locally — no upload, no server.
Image ↔ Base64 Converter
Convert images to Base64 and decode Base64 back to images

Generate

12 tools
UUID/GUID Generator
Generate unique identifiers instantly
MD5 Generator
Generate MD5 hash from text or files
SHA256 Hash Generator
Generate SHA256 hashes
SHA512 Hash Generator
Generate SHA512 hashes
Password Generator
Generate secure passwords
Fake Data Generator
Generate mock data
Commit Message Generator
Generate conventional commits
JWT Generator
Generate JWT tokens with HS256
Lorem Ipsum Generator
Generate placeholder text for your designs instantly
QR Code Generator
Generate QR codes instantly from URLs, text, or JSON — no backend needed
Code Screenshot Generator
Create beautiful, shareable images of your code
Gitignore Generator
Generate production-ready .gitignore files for any tech stack

Validate

7 tools
JSON Schema Validator
Validate JSON against schemas
Regex Tester
Test regular expressions interactively
HTTP Header Parser
Parse HTTP headers
Decimal Precision Calculator
Precise decimal calculations
Word Counter
Count words, characters, sentences and paragraphs instantly
Swagger / OpenAPI Viewer
Visualize and explore OpenAPI 3.x and Swagger 2.0 specs instantly
Mini Postman (API Tester)
Test REST APIs directly in your browser — no install needed

Time & Date

5 tools
Unix Timestamp Converter
Convert timestamps to dates
Timezone Converter
Convert between timezones
ISO8601 Formatter
Format and parse ISO8601 dates
Age Calculator
Calculate age from birth date
Cron Expression Generator
Build, validate, and visualize cron schedules with timezone-aware simulation