Formatters
JSON & Data JSON Formatter JSON Path JSON Schema Generator JSON Schema Validator YAML Formatter
Web HTML Formatter CSS Formatter JS Formatter
Database & Markup SQL Formatter XML Formatter
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Encoders
Encoding Base64 Encoder/Decoder URL Encoder/Decoder HTML Entity Encoder Hex Encoder/Decoder ASCII Encoder/Decoder
Decoding JWT Decoder Unicode Converter
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Generators
Identifiers UUID Generator ID Generator Password Generator
Data & Content Hash Generator Checksum Calculator Lorem Ipsum Generator Random Number Generator JSON Schema Generator
Visual Color Generator QR Code Generator
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Converters
Time & Numbers Timestamp Converter Date Calculator Number Base Converter
Format & Units Color Converter Temperature Converter Unit Converter Currency Converter
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Validators
Code & Syntax JSON Validator JSON Schema Validator XML Validator YAML Validator
Web & Patterns HTML Validator CSS Validator Regex Tester Email Validator
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Strings
Text Manipulation Text Case Converter Text Replacer Slug Generator
Compare & Analyze Text Diff Checker Diff Tool JSON Compare Text Compare String Length Calculator
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Network
IP & DNS IP Address Lookup IP Address Tools DNS Checker
Domains & URLs WHOIS Lookup URL Parser
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DevOps
Container & Pipeline Docker Helpers Kubernetes Config CI/CD Templates
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About DevTools

Free online utilities for developers, engineers, and technical teams

About DevFormatters

DevFormatters is an independent project built and maintained in Huaiyin District, Jinan, Shandong, China. Launched in 2026, the site provides a growing collection of free, browser-based developer tools — no accounts, no uploads, no tracking.

Privacy First

Every tool runs entirely in your browser. Your input — code, text, JSON, configuration files, or any other data — never leaves your device. Nothing is uploaded to a server, logged, stored, or shared. This makes the tools safe for proprietary source code, internal configs, API keys, and sensitive data. You can even save any tool page and use it offline on an air-gapped computer.

Tools Overview

  • Validators — HTML, JSON, XML, YAML, CSS with line-level error reporting
  • Formatters — Beautify and minify HTML, CSS, JavaScript, JSON, XML, YAML, SQL
  • Encoders & Decoders — Base64, URL, HTML entities, ASCII, Hex, Unicode
  • Generators — UUID, random ID, passwords, QR codes, Lorem Ipsum, hashes
  • Text Tools — Case converter, string length, text replacer, slug generator
  • Converters — Color, temperature, currency, unit, number base
  • Network — IP lookup, DNS checker, WHOIS lookup, URL/URI parser, IP converter
  • DevOps — Docker helpers, Kubernetes config snippets, CI/CD templates
  • More — Diff checker, regex tester, JWT decoder, date calculator, timestamps

How It Works

DevFormatters is built entirely with vanilla HTML, CSS, and JavaScript — no frameworks, no backend, no API calls. All formatting, validation, and syntax highlighting logic runs client-side. This is why your data stays private and tools respond instantly. The project uses a few trusted open-source libraries where appropriate, including js-yaml for YAML processing and DOMPurify for HTML sanitization.

Contact & Feedback

Have a suggestion, found a bug, or want to request a new tool? Feedback is always welcome.

Email: gmranqing@gmail.com
Location: Huaiyin District, Jinan, Shandong, China 250000