About CrimsonPDF
“Convert. Calculate. Conquer.”
CrimsonPDF is a free toolkit built for the parts of school life that don’t have a dedicated app — converting a file before a deadline, working out attendance percentages, or checking a citation format. Every tool is free, runs in your browser, and asks nothing of you first.
CrimsonPDF started in 2024 as a single GPA calculator, built out of frustration with how much of the “free” academic tooling online was actually a funnel toward a subscription. Every tool on this site is free, works in your browser, and doesn’t ask you to sign up first.
What began as one tool grew into a full toolkit for the small, recurring tasks that don’t fit anywhere else: converting a file, tracking attendance, building a seating chart, checking a citation format. CrimsonPDF is where those get solved fast.
Your files stay yours
Every tool runs client-side, in your browser. Files you convert or edit are never uploaded to a server.
Free means free
No premium tier hiding the tool you actually need, and no account wall before you can use anything.
Built for speed
Tools that open instantly and do one job well, instead of a bloated dashboard you have to learn.
Made for real coursework
Every tool started from an actual student or teacher task, not a generic “productivity” idea.