19 free developer tools — no sign-up required

Free Online Developer Tools

JSON formatter, Base64 encoder, JWT decoder, regex tester and 15 more tools. Everything runs locally in your browser — your data never leaves your machine.

⌘K

No signup or account

Data stays in your browser

100% free forever

Works offline

JSON Tools

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JSON Formatter

Beautify and format JSON with syntax highlighting

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JSON Validator

Validate JSON syntax and find errors instantly

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JSON Minifier

Compress and minify JSON to reduce file size

JSON Tree Viewer

Visualize JSON as an interactive collapsible tree

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JSON Diff Checker

Compare two JSON objects and highlight differences

Encode & Decode

Base64 Encoder/Decoder

Encode text and files to Base64 and decode back

URL Encoder/Decoder

Encode and decode URLs and query strings

HTML Encoder/Decoder

Encode HTML entities and decode them back

Gzip Compress/Decompress

Compress and decompress data with Gzip

Converters

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JSON to CSV

Convert JSON arrays to CSV format instantly

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CSV to JSON

Convert CSV files to JSON format

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JSON to XML

Convert JSON to XML with custom root element

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JSON to YAML

Convert JSON to YAML and YAML to JSON

Developer Utilities

JWT Decoder

Decode JWT tokens and inspect claims

Regex Tester

Test and debug regular expressions with live highlighting

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Markdown Preview

Write Markdown and preview rendered HTML

Color Converter

Convert colors between HEX, RGB, HSL and more

Hash Generator

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

Text Diff Checker

Compare two texts and highlight differences