Undetectable PDF Editing Web App

I’m building a browser-based PDF editor whose saved files show absolutely no trace of having been touched. The focus is text editing only, but with full control: users must be able to apply custom fonts,... (Budget: ₹12500 - ₹37500 INR, Jobs: API Development, Backend Development, Frontend Development, JavaScript, Software Engineering, Svelte, Vue.js, Web Development)