I kept hitting the same annoyance: I'd search for something simple like a JSON formatter or a Base64 decoder, land on a page covered in ads and popups, and half of them want you to paste your data into their server. For anything sensitive that's a hard no.
So I started building my own as plain static pages. They run entirely in your browser — nothing is uploaded, nothing is logged, and they work offline once the page has loaded. No signup, no account, no cookie wall. Here are eight I reach for most.
1. JSON Formatter & Validator
Paste messy JSON, get it pretty-printed (or minified), with the parse error shown if it's invalid. All client-side.
👉 https://tsetsobg.github.io/tools/json-formatter/
2. Base64 Encode / Decode
Encode or decode Base64 text both ways as you type. Handy for quick data-URI and token poking.
👉 https://tsetsobg.github.io/tools/base64-encode-decode/
3. UUID Generator
Generate v4 UUIDs one at a time or in bulk, copy with a click.
👉 https://tsetsobg.github.io/tools/uuid-generator/
4. Timestamp Converter
Unix epoch ↔ human-readable date, both directions, with your local and UTC time.
👉 https://tsetsobg.github.io/tools/timestamp-converter/
5. URL Encoder / Decoder
Percent-encode or decode query strings and components without firing up a console.
👉 https://tsetsobg.github.io/tools/url-encoder-decoder/
6. Hex ↔ RGB Converter
Convert colours between hex and RGB(A) — useful when a design tool gives you one and your CSS wants the other.
👉 https://tsetsobg.github.io/tools/hex-to-rgb-converter/
7. Markdown Table Generator
Paste CSV or tab-separated rows (straight from a spreadsheet) and get a clean, aligned Markdown table for your README.
👉 https://tsetsobg.github.io/tools/markdown-table-generator/
8. Unit Converter
Length, weight, temperature and volume in one place — type any field and the rest update.
👉 https://tsetsobg.github.io/tools/unit-converter/
Why static?
Each tool is a single static page with a small inline script — no framework, no backend, no analytics calls in the hot path. That means: it's fast, it works on a plane, and your input never leaves the tab. If you're privacy-conscious (or just tired of ad walls), that combination is surprisingly hard to find.
There are more in the same place if these are useful: https://tsetsobg.github.io/tools/
What tiny utility do you wish existed as a no-signup, offline page? I'm adding to the set and genuinely taking requests.
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