I don't run analytics on my site. Here's what 273,000 requests told me anyway.
Working out how many real people use a free tool, using only the CDN's numbers.
Rishab Dugar
Notes from building Fizzdoc and other things: browser engineering, WebAssembly, privacy-first web apps, agentic AI, system design and honest numbers from real side projects. By Rishab Dugar.
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The architecture of a website that can't see your files (74 tools, no backend)
Most "free online PDF tool" sites have the same architecture: your file goes up to their server, gets processed, and comes back. The privacy policy says they delete it after an hour. You have to take
I built a background remover that never sees your photo (and it does GIFs and videos too)!
When you’re the only engineer in the family, you automatically become the unpaid IT department, video producer, and resident graphic designer, because to relatives, "computers" is just one big subject
I put 64 file tools and an open-weight AI model in a browser tab. Nothing gets uploaded.
Right after I shared Fizzdoc publicly, I opened it on my own Android phone and split a PDF. It took six minutes. Six. On my laptop the same kind of job took about a second. The link was already out in
