Guides
Short, practical explainers on the formats and tasks behind our tools — written for people who just want the answer and a working tool at the end of it.
The Best Free Online Text Utilities (and When to Use Each)
There are hundreds of online text tools. This guide narrows them down to the handful you will actually reuse, grouped by the job you are trying to do.
How to Convert Text Case Online (Without Retyping Anything)
Retyping a paragraph because Caps Lock was on is a waste of time. Here is how case conversion works and which style to use where.
What Is Base64 Encoding, and When Should You Use It?
Base64 is everywhere — in data URLs, JWTs, email attachments and API payloads. It is also widely misunderstood as a form of security.
How to Format and Validate JSON Online
Unreadable single-line JSON and cryptic parse errors are two of the most common developer time sinks. Both are quick to fix once you know what to look for.
How to Generate a Secure Password (and What Actually Makes One Strong)
Most password advice is a decade out of date. Length beats complexity, and where the randomness comes from matters more than which symbols you include.
HTML vs Markdown: What's the Difference and When to Use Each
Markdown is a shorthand for a subset of HTML. Knowing where that subset ends tells you exactly when to reach for raw tags.
HEX to RGB Explained: How Colour Codes Actually Work
A hex code is just three numbers written in base 16. Once you can read it, converting between colour formats stops feeling like magic.
Converting PX to REM in CSS: A Practical Guide
Rem units respect the reader's browser settings. Converting from pixels is simple arithmetic once you know your root font size.