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Two developer & design tools, side-by-side. See which fits your task.
Developer & Design
Rng Validator — strict, copy-paste output, browser-side.
Open Rng ValidatorYour specific task is preview url at mobile, tablet, and desktop widths. Open the page, drop your input, get the result — typically under a second.
Your goal is rng validator — strict, copy-paste output, browser-side. Same approach: paste in, get the result, move on. No account, no upload.
Both tools live in the same category, so the choice depends on the exact subtask. Responsive focuses on preview url at mobile, tablet, and desktop widths; Rng Validator focuses on rng validator — strict, copy-paste output, browser-side. Try whichever description matches your goal more closely — they're both free.
Yes — both tools are free for unlimited personal use. The Pro plan unlocks higher limits and batch features but the core functionality stays free forever.
Absolutely. Many users chain multiple tools together — process a file with one, then feed the result into another. Nothing is uploaded, so chaining is essentially instant.
No. Both Responsive and Rng Validator work without signup. We only ask for an email if you decide to subscribe to a paid plan.