Articles & Tips
Practical guides and tips for the web, productivity, and security - concise and useful.
Most common PIN codes and how to pick a safe PIN
You keep hearing that 1234 is the most common PIN and wonder whether yours is just as easy to guess. We will show you the full list, the patterns attackers try first, how to pick a safe PIN and how to change it.
How to password-protect a PDF without Adobe Reader
Sending a contract or payslip by email and want only the person with the password to see it? Learn how to protect a PDF in your browser, choose a password and use AES-128 encryption.
What is Claude AI and what is it for? A plain-language explanation
Claude is an AI assistant from Anthropic. We explain clearly what Claude is, what it can do, how it differs from ChatGPT, and whether you can use it for free.
How to rotate a PDF and save the change permanently
A document opens sideways and the browser's rotate button does not fix the file. Learn how to save rotation in the PDF, rotate one page and see what remains unchanged.
25 best Claude prompts: practical examples you can copy
Copy practical Claude prompts for breaking down long documents and contracts, summaries with citations, feedback on your writing, natural rewrites, learning, source-backed research, and comparing options.
