Kastavo
Free browser-based tools. No uploads, no servers.
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Kastavo - Free browser-based tools. No uploads, no servers.

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Kastavo is a free portal with 99+ tools that run 100% in your browser — PDF, text, images, video, colors, and more. No file uploads to servers, no account needed, no tracking. Turn off your Wi-Fi and test it yourself. Privacy by design, not by policy.

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Hey Product Hunt! 👋 I'm Michel, solo dev behind Kastavo. The idea was simple: I was tired of uploading files to random sites just to compress a PDF or convert an image. So I built a portal where everything runs locally in your browser. No file ever leaves your device. Seriously — disconnect your Wi-Fi and test it. It still works. 99+ tools across PDF, text, images, video, colors, dev utilities and more. Built with Next.js, 100% client-side, open to use for free. Would love your feedback — especially on which tools you'd want to see next! 🙏