Can I merge and split PDFs without uploading them?: Yes. The Documents tools are designed for local, in-browser processing when your browser and device can handle the selected files. Merge PDF, Split PDF, Rotate PDF, Extract PDF Pages, and Images to PDF all work directly on your local files in supported browsers.
Does Compress PDF guarantee the smallest possible file?: No. Compress PDF is an honest v1 optimize pass that re-saves the document with a lighter internal structure. It can reduce size, but it is not the same as aggressive server-side recompression or quality-lossy conversion.
Can I fill out and flatten PDF forms?: Yes. Fill PDF Form inspects supported form fields, lets you enter values locally, and exports a flattened PDF copy for sharing, printing, or filing.