DevToolKit

Free Developer Tools

Fast, free, and private. All tools run 100% in your browser. No data is ever sent to our servers.

No sign-up required
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JSON Formatter & Validator
Format, validate, and minify JSON data instantly.
FormatValidateMinify
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Diff Checker
Compare two texts or code blocks side by side.
CompareTextCode
JWT
JWT Decoder
Decode and inspect JSON Web Tokens securely.
DecodeSecurityAuth
B64
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 to text.
EncodeDecodeBase64
%20
URL Encoder & Decoder
Encode or decode URLs and query parameters.
URLEncodeDecode
ID
UUID Generator
Generate random UUID v4 identifiers in bulk.
UUIDGenerateRandom
#
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes.
MD5SHA-256Hash
TW
Tailwind CSS Converter
Convert between Tailwind CSS classes and vanilla CSS.
TailwindCSSConvert
CLR
Color Converter
Convert colors between HEX, RGB, HSL, and OKLCH.
HEXRGBOKLCH
*/5
Cron Expression Generator
Build and decode cron expressions with a visual editor.
CronScheduleGenerate
SQL
SQL Formatter
Format and beautify SQL queries with proper indentation.
SQLFormatBeautify
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Regex Tester
Test regular expressions with live match highlighting.
RegexTestMatch
T
Timestamp Converter
Convert between Unix timestamps and human-readable dates.
UnixDateTime
Y/J
JSON to YAML
Convert between JSON and YAML formats instantly.
JSONYAMLConvert
MD
Markdown Preview
Write Markdown and see live HTML preview side by side.
MarkdownPreviewHTML

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