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Short, practical notes on image formats, compression and privacy.
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Forms often ask for a photo under 100 KB or 200 KB. Learn how quality and dimensions trade off, with measured sizes, and how to hit a target size.
4 min readCompress
Windows won't open iPhone HEIC photos out of the box. Here are the ways to view them, and the quickest ways to convert them to JPG without installing anything.
1 min readFixes
Phone photos can store the exact place they were taken. Here's what's inside the file, when it gets shared with others, and how to check your own photos.
2 min readPrivacy
HEIC files are smaller than JPGs at the same quality, but plenty of software still can't open them. Here's how the two compare and when to convert.
2 min readBasics
Remove location, camera details and dates from your photos before sharing them, with no quality loss. Here's how to do it, and how to confirm it worked.
2 min readPrivacy
A single table of the common image sizes for Instagram, Facebook, X, LinkedIn, YouTube, Pinterest and TikTok, and how to make them all from a single photo.
2 min readBasics
A practical guide to the four common image formats, with file sizes measured on the same test image, and a simple rule for choosing between them.
4 min readBasics
Measured file sizes at quality 90, 75 and 60, and JPG against WebP and AVIF at settings that look the same, so you can shrink images without visible damage.
3 min readCompress
Most online image tools upload your photo to a server. Here is what that costs you in privacy and time, and how browser-only tools avoid it.
4 min readBasics