Developer Tools

The other categories on this site deal with text people write and read. These tools deal with text machines produce — an encoded token in an Authorization header, a data URI buried in a stylesheet, a secret stored in a config file. They're the small conversions that come up constantly while building and debugging, where opening a terminal or writing a one-off script is more friction than the task deserves.

These tools often get used back to back. A JWT or an API payload arrives Base64-encoded; decode it, and what comes out is usually JSON — paste that into the JSON Validator to check it's well-formed and format it into something you can actually read. Going the other way, validate and minify a JSON config before encoding it into an environment variable or a URL parameter. And when you need to pull specific values out of a log or a response, the Regex Tester lets you build and check the pattern against the real text first.

The JWT Decoder reads the header and payload of a JSON Web Token and turns its expiry claims into dates, which settles most "why is this request unauthorized?" questions. It only decodes: it never checks the signature. When the data you need is a table rather than a token, the JSON to CSV Converter flattens nested objects into columns, previews the rows and gives you a file to open in a spreadsheet.

URL Decode and URL Encode handle the percent-escapes in links and query strings: decode a redirect target or a log entry to read what it really says, or encode a value before it goes into a URL so an ampersand or a space cannot change how the link is parsed. The two pages share one tool, so you can flip between them and check a value round-trips.

The Text to ASCII Converter shows the numeric code behind each character in decimal, hex, octal or binary, which helps when a log, a protocol or a stubborn string comparison comes down to a single character. The UUID Generator produces random version 4 identifiers in bulk and checks any UUID you paste.

The Hex to RGB Converter covers the front-end side: a designer hands over hex codes, the stylesheet needs rgb() or rgba(), and the swatch confirms it's the right color before it ships.

When you're choosing a color rather than converting one, the Hex Color Picker lets you drag to a shade and copy it as HEX, RGB, or HSL, with a contrast check against white and black alongside.

The CSS Minifier does the same for stylesheets, taking out comments and whitespace while leaving strings, url() values and calc() spacing alone. The HTML Minifier trims a page's markup before launch: it strips comments and whitespace, shows how many bytes that saved, and leaves code samples and inline scripts exactly as written.

The MD5 Hash Generator handles integrity checks: hash a download or a payload and compare it against a published checksum, with SHA-256 alongside for anything that needs a stronger algorithm.

Because these formats so often carry sensitive values, privacy matters more here than anywhere else. Every tool in this category runs entirely client-side, so you can decode a production token or encode a credential without it ever touching a third-party server. For a lower-level look at how text becomes bytes, the Text to Binary Converter pairs naturally with the Base64 tool.