Question: Can you recommend a tool that allows me to edit and annotate PDF files online?

If you want a utility that can handle all sorts of PDF editing and annotation tasks online, LightPDF is a good option. The AI-powered service has a range of PDF tools, including conversion, editing, merging, splitting, annotating, signing and optimizing PDFs. It can also handle other file formats like Word, PowerPoint, Excel, Text, PNG and JPG, making it good for personal and professional use. With cloud sync and support for desktop, mobile and web interfaces, LightPDF is pretty convenient.

Another option is Xodo, an all-purpose PDF tool that can handle secure editing and management of PDF, Office and image files. Xodo's features include AI-powered PDF summarization, document conversion and e-signing. It has a range of pricing options for different needs and works on multiple devices, so it's a good pick for real estate, finance, AEC and education.

If you're looking for something free, PDFgear is a powerful tool for reading, editing, converting, merging and annotating PDFs. It's got OCR technology for extracting text from image-based documents, too, and can handle many other file formats. PDFgear comes with both a web-based interface for quick online editing and conversion and an AI-powered editor that lets you use natural language to interact with PDFs, so it's good for personal and professional use.