LibreOffice Draw can open PDFs and edit them as vector documents. It is the most capable free offline PDF editor on the market, and the UI looks like 2007.
Flint goes the other way — browser-based, modern, paid for serious use. Here is the comparison.
Where LibreOffice Draw wins
Free and offline. Runs on Linux, Mac, Windows. Heavy editing of complex layouts. Vector-level control. Open-source. If 'free and offline' are your hard constraints, this is the answer.
Where Flint wins
Modern UX. No install. Faster to start editing — drop file, edit, download. Sign-pdf flow is far smoother. Convert-pdf does not require Word installed locally.
Best for…
LibreOffice Draw for free, offline, Linux-friendly heavy editing. Flint for fast browser editing with day-pass billing.
Honest verdict
LibreOffice Draw is a remarkable piece of free software. The UI is the cost. If you can stomach it, you keep your money. If you cannot, Flint exists.
FAQ
Is LibreOffice safe?
Yes — it is a major open-source project. Download from the official site.
Does LibreOffice Draw work on Chromebook?
Only via Linux container. Flint is the easier ChromeOS option.
Will Draw open all my PDFs?
Most. Heavily compressed or unusually structured PDFs sometimes glitch on import.
Free and offline: LibreOffice. Browser and modern: Flint.