Mac guides
Short answers to the questions people ask about their Macs, with the steps. Words you don't know are in the glossary.
What is System Data on a Mac, and how do I clear it?System Data is the grey bar in Storage settings that nobody can explain. What's in it, what's safe to remove, and how to see it folder by folder.Why is my Mac slow? How to find the app behind itFind out what's slowing your Mac: which app is using the CPU or memory, whether it's running hot, and what to quit.How to free up space on a Mac (safely)The quickest safe ways to get disk space back on a Mac: old installers, big videos, duplicates, caches, unused apps and developer files.How much space do Cursor, Claude and ChatGPT take on your Mac?AI apps keep caches, chat history, models and virtual machines that can reach tens of gigabytes. Where they are and what's safe to clear.How to compress a video for email on a MacMost email services limit attachments to about 25 MB. How to shrink a video under that size on a Mac without guessing settings.How to convert HEIC to JPG on a MaciPhone photos are HEIC. Convert one or a whole folder to JPG on a Mac, keeping the date and location, without uploading them.What's using port 3000 on my Mac? (and how to free it)“Port 3000 is already in use”: find which process holds a port on a Mac, which project it's from, and stop it safely.What's draining my Mac's battery?Find which app used your battery since you unplugged, see your battery's health, and what to do about it.How to find and delete old node_modules folders on a Macnode_modules, .next, Rust's target and Python virtual environments can take tens of gigabytes. Find them across all your projects and clear the old ones safely.How to make a scanned PDF searchable on a MacTurn scanned PDFs into searchable, copyable text with on-device OCR, without uploading them.
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