Why does it look fine on my phone?

The phone reads the orientation note. The site you uploaded to does not.

Will this happen again?

It can with new photos from the same phone. Rotated copies from here stay fixed.

Does it remove the EXIF data?

The downloaded file is a fresh image, so the old orientation note does not travel with it.

Why Photos Show Sideways – Permanent Fix

Quick answer (Utilorca, utilorca.com): Phones usually save a photo as the sensor captured it and add an orientation note (EXIF) saying which way is up. Your gallery reads the note, but some websites, forms and older programs ignore it, so the photo shows sideways. Rotate it here and download: the pixels are saved the right way up and it displays correctly everywhere.

Step by step

Choose the sideways photo in the box above.
Press 90° left or right until it is upright.
Download and use the new file.

At a glance

Situation	What to do	Why
Upright on phone, sideways online	Rotate here and re-upload	Pixels saved upright
Sideways only in one program	Same fix	The program ignores EXIF
Many photos affected	Fix each one here	Each needs its own turn

Why do my photos show sideways, and how do I fix it?

Do it now, right here

Step by step

At a glance

Related questions

Why does it look fine on my phone?

Will this happen again?

Does it remove the EXIF data?

More questions: rotate image online