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Amar Kleft a comment
Hi folks, I have added couple of more tools in drop.calcont.in that are Add watermark on pdf with customisations Add password to pdf and encrypt pdf tool Do check it out !!
Drop by CalConTBrowser-powered file & AI tools built for privacy
Amar Kleft a comment
Hey everyone 👋 Maker of Drop here. This started as a fun side project because I wanted to learn backend engineering by building a large file-processing system (queues, workers, concurrency, etc.). Initially I built everything the traditional way: upload file → server processes → download result. But before launching publicly, I realised two things: Server-heavy file processing gets expensive...
Drop by CalConTBrowser-powered file & AI tools built for privacy
Privacy-first PDF, image & AI toolkit that runs directly in your browser.
No uploads. No storage. No data leaks.
Process PDFs, images & QR files, use AI PDF summariser, and import from Google Drive — all in one clean workspace without jumping between tools.
Built using Web Workers & WASM so ~99% processing happens on your device.
18 tools live, 100+ planned.
Would love feedback from the community 🚀
Drop by CalConTBrowser-powered file & AI tools built for privacy