CS Dev Tools
Developer tools that stay in your browser
Format JSON, decode JWTs, beautify SQL, test regex, and more — free, fast, and private. No signup. No uploads.
Instant
Results update as you type with zero network round-trips for core processing.
Private by design
Your payloads, tokens, and snippets are processed locally in your browser.
AdSense-ready
Clear policies, contact details, and quality content for a compliant experience.
Popular tools
Start with the utilities developers open every day.
JSON Formatter
Beautify and format JSON with indentation.
Open tool →JSON Validator
Validate JSON and highlight syntax errors.
Open tool →YAML Converter
Convert between YAML and JSON.
Open tool →SQL Formatter
Beautify SQL queries cleanly.
Open tool →Base64 Encode/Decode
Encode or decode Base64 strings.
Open tool →JWT Decoder
Decode JWT header and payload.
Open tool →Regex Tester
Test regular expressions live.
Open tool →Markdown Editor
Write Markdown with live preview.
Open tool →All developer tools
22 free online utilities for formatting, encoding, generating, and testing — built for responsive phones and desktops.
Formatters
JSON Formatter
Beautify and format JSON with indentation.
Open tool →XML Formatter
Pretty-print XML for easier reading.
Open tool →SQL Formatter
Beautify SQL queries cleanly.
Open tool →HTML Minifier
Minify HTML by removing whitespace.
Open tool →CSS Minifier
Compress CSS for production.
Open tool →JavaScript Beautifier
Beautify JavaScript source code.
Open tool →Converters
YAML Converter
Convert between YAML and JSON.
Open tool →Timestamp Converter
Convert Unix timestamps and dates.
Open tool →Case Converter
Convert text between naming cases.
Open tool →Color Converter
Convert HEX, RGB, and HSL colors.
Open tool →Number Base Converter
Convert binary, octal, decimal, hex.
Open tool →Encoders & Decoders
Generators
Testers
Why CS Dev Tools?
Most browser “devtools” sites bounce you through popups or capture sensitive paste data. CS Dev Tools is built for everyday engineering work: clean UI, fast client-side transforms, and SEO pages that stay useful for humans — not just crawlers.
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