ToolsMonk is a Windows desktop app with 250+ tools for PDFs, images, text, SEO checks and everyday calculations, in one window.
Most tools run entirely on your device: you pick a file, it is processed locally, and it never leaves your computer. A few need a server, such as the AI features and the tools that fetch a page from the web. The app says which is which, and the list is at https://toolsmonk.com/where-your-files-are-processed
PDF: edit, merge, split, compress, sign, redact, fill...