ChatGPT
Chatbots & Assistants
OpenAI's all-round assistant for writing, images, research, voice chat, agents and study help.
Freemium
Stirling PDF
ProductivityOpen Source
About
Stirling PDF is a popular open-source PDF toolkit: edit, merge, split, compress, convert, OCR, redact and sign PDFs locally so documents never leave your machine.
Key features
50+ PDF tools
OCR and redaction
Runs locally/self-hosted
No watermarks
Best for
Private documents (bank, ID)Office PDF work
Pricing & plans
Open-source software. Check the official website for details.
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