Free online HTML / CSS / JS live editor + 60+ developer tools.
No signup. No ads. 100% client-side — your code never leaves the browser.
🌐 Live Site · 🧰 All Tools · 💡 Request a Tool · 💬 Discussions
- All-in-one — HTML / CSS / JS playground plus 60+ developer tools in a single tab
- Private — code runs entirely in your browser, nothing is uploaded
- Free forever — no signup, no ads, no upsell
- Multilingual — EN · ES · ZH · HI · FR · TR
- Modern UX — dark mode, autosave, shareable snippets, cheatsheet
Formatters & Validators JSON · SQL · HTML / CSS / JS Beautifier · Markdown · JWT Decoder
Generators UUID / ULID · QR Code · Hash (MD5, SHA-256, SHA-512) · Password · Favicon · Lorem Ipsum · Sitemap.xml · robots.txt · Schema.org JSON-LD · Meta Tags
Converters Base64 (text & files) · URL encode / decode · cURL → Python / JS / PHP / Go · Tailwind ↔ CSS · HTML ↔ JSX · JSON ↔ YAML ↔ XML ↔ CSV · Markdown → HTML · Image → Base64 · SVG → PNG · Unix Timestamp · Number Base
CSS Toolkit Gradient · Mesh Gradient · Box Shadow · Glass effect · Border Radius · Cubic-Bezier · Loader generator · Color Palette · Contrast Checker (WCAG)
Dev Utilities Regex Tester · Cron builder + visualizer · Diff (text & JSON) · Word counter · Slug · Case converter · HTTP Header inspector · AI Token Counter · Code Screenshot · Pomodoro
No install. Just open: onhtml.com
Got an idea for a tool? Found a bug?
We ship requested tools weekly.
If onHTML saves you time, star this repo — it genuinely helps more devs discover it.