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Developer Tools

Free online tools to format, convert, test, and generate data

JSON Formatter & Validator

Format, validate, and minify JSON with clean indentation and error checks.

JSON formatter
JSON validator
JSON beautifier
JSON minifier
JSON viewer

JWT Decoder

Decode JWT header and payload instantly with pretty JSON output.

jwt decoder
decode jwt
jwt parser
jwt tool
json web token

SQL Formatter

Beautify SQL queries with clean indentation and keyword casing.

SQL formatter
SQL beautifier
format SQL
SQL prettify
SQL indent

Base64 Encoder & Decoder

Encode or decode Base64 for text and files.

Base64 encoder
Base64 decoder
encode Base64
decode Base64
Base64 converter

URL Encoder & Decoder

Encode and decode URLs and query parameters.

URL encoder
URL decoder
encode URI
decode URL
percent encoding

Regex Tester

Test regular expressions with matches, groups, and flags.

regex tester
regular expression
regex tool
pattern matching
regex online

UUID Generator

Generate UUID v4 identifiers in bulk for apps and databases.

UUID generator
GUID generator
UUID v4
unique ID
random ID

Password Generator

Create strong passwords with length and character options.

password generator
strong password
random password
secure password
password tool

HTML, CSS & JS Editor

Edit HTML, CSS, and JavaScript with a live preview.

HTML editor
CSS editor
JavaScript editor
live preview
web editor

JavaScript Playground

Run JavaScript in your browser with instant output and error reporting.

JavaScript playground
run JavaScript online
JS editor
JS console
JS runner

Markdown Preview

Write Markdown and preview HTML instantly.

markdown preview
markdown editor
markdown to html
md preview

CSV to JSON Converter

Convert CSV data to JSON with headers and type detection.

CSV to JSON
CSV converter
JSON converter
CSV parser
data converter

XML Formatter

Format, validate, and minify XML with clean indentation.

XML formatter
XML validator
XML beautifier
XML minify
XML pretty print

Text Case Converter

Convert text to UPPERCASE, lowercase, sentence case, and title case.

text case converter
uppercase
lowercase
sentence case
title case
Free Developer Tools

Access a growing collection of practical developer tools for 2026 workflows. All tools run in the browser, require no sign-up, and keep your data private on your device.

Built by Desnar for developers, designers, and teams who need fast, reliable formatting, conversion, and testing tools.

Need custom software beyond these tools?

Explore our services or contact us to discuss your project requirements.

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