Practical guides for free online tools. 325 articles — page 13 of 28.
You typed an ampersand in your HTML. It broke the page. You typed a copyright symbol in your email. It showed as ?. HTML entities prevent these failures — here's when and how to use them.
Every day since 1995, NASA has published one astronomy image with an explanation written by a professional astronomer. It's the longest-running daily science communication project on the internet — and a free classroom resource.
CSS minification removes whitespace and comments. SVG minification does that too — but also removes editor metadata, simplifies paths, and rounds coordinates. Different file types, different optimizations.
A random number between 1 and 100 gives every value equal probability. Rolling 2d50 gives a bell curve peaking at 51. Different tools, different probability distributions, different use cases.
Satellites fail. Internet goes down. Cell towers lose power. But a flashlight, a radio tone, or a blinking light can still send Morse code across any distance. Here's why the simplest encoding system refuses to die.
You want consistent code formatting across your team. You could ask everyone to install Prettier. Or you could enforce it in CI/CD — no installs, no excuses. Here's how to integrate an online formatter into your workflow.
An API returned image data as a Base64 string. You need to see the actual image. Here's how to decode Base64 to an image file in seconds — no terminal, no script, no ImageMagick.
Paying extra toward your loan principal saves interest. But paying extra at the beginning of the loan saves dramatically more than paying extra at the end. Here's the math and the strategy.
A QR code generator creates codes. A QR code scanner reads them. They are two halves of the same technology — but the use cases are completely different, and confusing them leads to dead ends.
You have a CSV file from an export. You need it as formatted JSON for an API. That's two steps: convert CSV to JSON, then format the JSON. Here's why the pipeline matters more than either tool alone.
A coin flip is the universal symbol of fairness — 50% heads, 50% tails. But researchers have found a tiny bias that makes coin flips 51/49. Here's the physics and the math behind the imperfection.
You got a JWT token from an API response. You need to see what's inside. Here's how to decode it safely — and the red flags that tell you a JWT decoder is trustworthy.