I've been using https://www.sejda.com/ https://www.sejda.com/ and https://lottatools.com/ https://lottatools.com/ for light weight tasks. They both run in brows

I've been using https://www.sejda.com/ https://www.sejda.com/ and https://lottatools.com/ https://lottatools.com/ for light weight tasks. They both run in browser, probably with a wasm backend.