Web-Tutorial.com: Free online development tools

Hi PH 👋

This started as a class project. I teach web development at a vocational college in China, and over one summer 12 students and I built the site we kept wishing existed: one place for the utilities we googled during lessons, plus tutorials that actually run in the browser.

A few things that might matter to you:

• 32 tools, all client-side. Open DevTools → Network and watch it stay quiet. No upload, no account, no ads.

• 5 languages: English, 中文, 日本語, العربية, Português. Arabic is full RTL, not a translation bolted on.

• Every code block in the tutorials is executed before publishing — not "looks right", actually runs.

• Static HTML + vanilla JS. One CSS file per tool. No framework, no build step, no tracking.

What I'd love feedback on: which tools feel genuinely useful, and which ones are filler? Some of them exist because a student had a free weekend and an idea, and I'm honestly not sure all of them deserve to exist.

Thanks for looking.