jstooljstool.app
client-side · no tracking · no sign-up

Dev tools, right in your browser.

No servers, no tracking, no sign-up. Every utility runs client-side — your data never leaves your machine.

Encoders

b64
Base64Encoder

Encode and decode Base64 strings.

url
URL EncodeEncoder

Percent-encode and decode URL components.

&amp
HTML EntitiesEncoder

Escape and unescape HTML special characters.

🖼
Image to Base64Encoder

Convert any image to a Base64 string or Data URL.

Formatters

{ }
JSON ExplorerFormatter

Edit, format, and navigate JSON with a tree view.

.{}
CSS FormatterFormatter

Format and minify CSS stylesheets.

</>
XML FormatterFormatter

Prettify and validate XML documents.

sql
SQL FormatterFormatter

Format and beautify SQL queries.

Converters

md
MarkdownConverter

Preview and export Markdown as HTML.

rgb
Color ConverterConverter

Convert between HEX, RGB, and HSL values.

⌚
TimestampConverter

Convert Unix timestamps to readable dates.

→md
HTML to MarkdownConverter

Paste formatted webpage content and get clean Markdown.

Generators

uid
UUID GeneratorGenerator

Generate RFC 4122 v4 UUIDs.

***
PasswordGenerator

Create strong, configurable random passwords.

#
Hash GeneratorGenerator

Compute MD5, SHA-1, and SHA-256 hashes.

Utilities

jwt
JWT DecoderUtilitie

Inspect and decode JSON Web Tokens.

$.
JSON QueryUtilitie

Extract values from JSON using JSONPath expressions.

.*
RegEx TesterUtilitie

Test and debug regular expressions live.

0x
Number BaseUtilitie

Convert between binary, octal, decimal, hex.

🔗
URL ParserUtilitie

Break a URL into scheme, host, path, and query parameters.

csv
CSV ViewerUtilitie

View CSV as a table or convert to JSON.

crl
cURL BuilderUtilitie

Configure an HTTP request and generate the curl command.