Students deal with PDFs constantly -- lecture slides, research papers, assignment submissions, textbooks. The problem is that most PDF software either costs money or requires installing something. Here are the best free browser-based PDF tools for student use, all from one place with no signup required. 1. Merge PDF — combine lecture slides and notes Professors share slides as separate PDFs per lecture. By the end of the semester you have 12 separate files for one subject. Merge PDF lets you combine all of them into a single document for easier navigation and studying. How to use: Upload multiple PDF files, drag to set order, click Merge. Download the combined PDF. Best for: combining weekly lecture PDFs into one semester file, merging your notes with the official slides. 2. Compress PDF — email submissions under size limits Most assignment submission portals have a file size limit (often 5-10 MB). Scanned notes or high-resolution PDFs can exceed this easily.…