KillerPDF

KillerPDF is a portable PDF editor for Windows with no installer, no account, no telemetry. GPLv3 and maintained by a solo developer. It does the things most people use Adobe Acrobat for: edit text, add signatures, merge and split pages, extract images, fill forms.

"Portable" means you download a single .exe and run it. No system integration, no registry keys, no background processes. For teams that need PDF editing on machines without admin rights or on USB sticks moving between locked-down computers, that alone is the reason to install it.

Solo users on Windows get a free replacement for the $15/month Adobe Acrobat subscription or the $160 one-time Nitro license. Small teams save per-seat fees. Large teams with document workflows still want something with audit trails and integrations.

The catch: Windows only, no Mac or Linux builds. The UI is functional rather than polished, and for anything beyond basic editing (advanced redaction, OCR, accessibility compliance) you still want a paid tool.