Guides
The answers
before the tool.
Why a HEIC won't open, what a 50 KB limit really means, what size a passport photo has to be. Short, practical, and free of the usual filler.
16 September 2026 4 min read
Why won't my HEIC photos open on Windows?
HEIC is Apple's default photo format, and Windows often can't open it. Here's why, the three ways to fix it, and how to stop your iPhone making HEIC files at all.
Read the guide 16 September 2026 5 min read
How to compress a photo for an online form
Forms reject photos for being too large. Here's what those KB limits mean, how to hit 50 KB or 100 KB exactly, and what to do when the form wants specific dimensions too.
Read the guide 16 September 2026 5 min read
Passport photo sizes, and how to make one that's accepted
Passport photo sizes by country, what 35 × 45 mm means in pixels, the file size limits portals impose, and the reasons photos get rejected.
Read the guide 16 September 2026 5 min read
WebP vs AVIF vs JPG: which should you use?
How WebP, AVIF, JPG and PNG compare on file size, quality, transparency and support — and a simple rule for choosing between them.
Read the guide