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Direct answers to questions people actually type, each one followed by the tool that does the job in your browser. Each page states the answer in its first paragraph, explains the parts that are easy to get wrong, and embeds the tool so you do not have to go looking for it.
How do I add a blank page to a PDF?Add a blank page to a PDF and work out how many you need: even page counts for duplex, multiples of four for a stapled booklet. Runs in your browser.How do I duplicate a page in a PDF?Duplicate a PDF page and get the count right: the setting is total copies, not extra ones. Page ranges, print-run advice, and why n-up is a different job.What is my screen size in pixels?Read your screen size in pixels straight from the browser, with the difference between CSS pixels, physical pixels and the visible viewport explained.What aspect ratio is my monitor?Work out your monitor aspect ratio from its resolution, with a table of common resolutions and why an ultrawide sold as 21:9 is really 43:18.What does status 301 mean?HTTP 301 means Moved Permanently. What the server sends, how it differs from 302, 307 and 308, and why a 301 is hard to take back once it is cached.How many tokens is 1,000 words?One English word averages about 1.33 tokens, so 1,000 words is roughly 1,330 tokens. Conversion tables for prose, code and JSON, and why the ratio moves.What is 60,000 in 2013 worth today?The formula for converting a past amount into today money, a worked example for 60,000 from 2013, and why two inflation calculators give different answers.