The file problems people actually have

Gmail stops at 25 MB, Outlook at 20 MB. Here's how to actually shrink a video, PDF or photo on your Mac so it sends — with the free method first, and what to do when you have 200 of them.

A 3-minute iPhone video shouldn't be 1.2 GB. Here's what actually makes MOV files huge — ProRes, 4K60, HEVC — and how to cut the size on a Mac without uploading it anywhere.

You sent a Mac video to a Windows colleague and it won't open, or plays with no picture. Here's why — HEVC and ProRes — and how to convert it on your Mac so it just works.

Convert a whole folder of iPhone HEIC photos to JPG on your Mac — the free built-in way with Preview and Quick Actions, and the faster way when there are hundreds.

What actually happens to a file you drop on an online converter, when that matters, and every way to convert locally on a Mac instead — built-in tools, ffmpeg, and one app that covers the rest.

WhatsApp caps video at 16 MB (2 GB for documents). Here's how to get your clip under the limit on a Mac without destroying the quality, and the trick most people miss.