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DevToolBox

15+ free developer tools. No login, no API, works offline.

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JSON Formatter

Format, validate and beautify JSON data

Input JSON
Formatted Output
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Base64 Encoder/Decoder

Encode or decode Base64 strings

Input Text
Output
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URL Encoder/Decoder

Encode or decode URL components

Input
Output
📝

HTML Entity Encoder/Decoder

Encode or decode HTML entities

Input
Output
#️⃣

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

Input Text
Hash Results

Enter text and click Generate

🆔

UUID Generator

Generate random UUIDs (v4)

Options
Generated UUIDs

Click Generate to create UUIDs

🎨

Color Converter

Convert between HEX, RGB, HSL color formats

#3B82F6
⏰

Timestamp Converter

Convert between Unix timestamp and human-readable date

Current Time
Timestamp to Date
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Date to Timestamp
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Regex Tester

Test and debug regular expressions

Pattern
Test String
Matches

Enter pattern and test string

📊

Text Diff

Compare two texts and find differences

Original Text
Modified Text
Differences

Enter both texts and click Compare

🎫

JWT Decoder

Decode and inspect JSON Web Tokens

JWT Token
Decoded Token

Enter a JWT token to decode

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Lorem Ipsum Generator

Generate placeholder text

Options
Generated Text
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Password Generator

Generate secure random passwords

Options
Generated Password
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CSS Gradient Generator

Create beautiful CSS gradients

Color 1
Color 2
CSS Code
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Minify / Beautify

Minify or beautify HTML, CSS, JavaScript

Input Code
Output
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Unit Converter

Convert between different units

Data Storage
CSS Units (px base)
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Number Base Converter

Convert between decimal, binary, hex, octal