Markdown vs HTML: When to Use Each
You want to write something for the web — a README file, a blog post, some documentation. Should you write…
Jan van Dijk · Jun 5, 2026
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utm-builder
UTM Builder
Create trackable campaign URLs with UTM parameters for Google Analytics 4.
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json-formatter
JSON Formatter
Format, validate and beautify JSON data instantly in your browser.
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base64-encoder
Base64 Encoder
Encode and decode Base64 strings online. Works with text and files.
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word-counter
Word Counter
Count words, characters, sentences and paragraphs in your text.
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markdown-preview
Markdown Preview
Write Markdown and see rendered HTML in real time with live preview.
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regex-tester
Regex Tester
Test regular expressions with real-time match highlighting and details.
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Latest articles
Jan van Dijk · Jun 5, 2026
Regex Cheat Sheet: Common Patterns Explained
Regular expressions — regex for short — look like someone fell asleep on the keyboard. ^\d{3}-\d{4}$ isn’t exactly inviting. But…
Jan van Dijk · May 18, 2026
What Is URL Encoding? Why %20 Means Space
Have you ever copied a link and noticed it was full of strange codes like %20, %3D, or %26? Maybe…
Jan van Dijk · Apr 29, 2026
JSON vs CSV: What’s the Difference?
You’ve been handed a data file. It might be a list of customers, a product catalog, or an export from…
Jan van Dijk · Apr 11, 2026
How to Measure Marketing ROI (Even If You’re Not a Marketer)
A few years ago, a small e-commerce client asked me: “We’re spending €2,000 a month on ads. Is it working?”…
Jan van Dijk · Apr 4, 2026
First-Party vs Third-Party Cookies Explained
When Google announced it would phase out third-party cookies in Chrome, I got calls from three clients the same week…
Jan van Dijk · Mar 31, 2026
Built by Jan van Dijk
Independent web analyst · Amsterdam
I got tired of hunting across dozens of sites for simple everyday tools — buried under ads, pop-ups and sign-up forms. So I built what I wished existed: clean utilities that just work.
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