Guides
Practical, carefully researched answers to the file questions we hear most — written and maintained by the younisconvert team.
Updated 2026-10-06 · 7 min read
HEIC vs JPG: what iPhone photos really are and when to convert them
Why iPhones save photos as HEIC, which apps can't open them, and how to convert HEIC to JPG without losing quality or leaking location data.
Updated 2026-10-05 · 9 min read
Passport photo requirements by country: sizes, head height and common rejections
A practical comparison of passport photo dimensions for the US, UK, Canada, EU/Schengen, India and more — plus the mistakes that get photos rejected.
Updated 2026-10-04 · 6 min read
How to compress images without visibly losing quality
Understand quality settings, resolution and modern formats like WEBP and AVIF so you can hit upload limits while keeping photos sharp.
Updated 2026-10-03 · 6 min read
JPG, PNG, WEBP or PDF? Choosing the right file format
A plain-language guide to picking the right image or document format for the web, printing, email and official submissions.
Updated 2026-10-02 · 5 min read
Is online file conversion safe? What happens to your uploaded files
How typical online converters handle your files, the privacy risks of server-side processing, and how in-browser conversion avoids them.
Updated 2026-10-06 · 6 min read
Turning PDFs into images and images into PDFs: a complete guide
When to convert PDF to JPG or JPG to PDF, how resolution and page order work, and tips for scanning documents with your phone.