Question: I'm looking for an all-in-one PDF tool that can help me with tasks like cropping, compressing, and merging files, without requiring installation or subscription.

If you're looking for an all-in-one PDF tool that doesn't need installation or a subscription, HiPDF is a great option. It has a range of tools for cropping, compressing, merging and other tasks, using AI to make PDFs a breeze to work with. With conversion tools to and from Office formats, image tools for resizing and rotation, and document management with 10GB of free cloud storage, HiPDF is a powerful and easy-to-use tool.

Another good option is pdfAssistant, a 24/7 AI chatbot that lets you get PDF work done through a conversational interface. It can convert, compress, merge, add watermarks or passwords, and more, with secure and reliable results. pdfAssistant uses a pay-as-you-go credit system so you don't have to pay for anything up front.

If you need something more flexible, LightPDF is an AI-powered platform for conversion, editing, merging and more. It's available on desktop, mobile and web, with cloud sync for use on multiple devices. With free and tiered pricing options, LightPDF is good for individuals and businesses.

Last, TinyWow offers a variety of free tools, including PDF merging, editing and compression. It also offers image editing, video conversion and write tools, so it's a good utility for a variety of document and image processing tasks. And because it requires no registration or payment, it's good for quick, no-cost tasks.