Doka.photo is a nice, simple photo editing tool that is available via your web browser. It pulls images from your computer or phone and allows you to make simple edits from cropping and color adjusting to marking up and resizing.
For prepping an image to post on a news site or readying a photo to go on social, this is a nice, free photo editing option to check out.
I first called it up on my laptop in Chrome and played around with an image I had on my computer. After that, I went to check it out on my iPhone. There, I pulled up Safari, went to doka.photo and found myself working with the same tool I’d been working with on my laptop.
The tool labels are a bit easier to follow on the laptop/desktop version so I might check this out there before pulling it up on your phone. Once you do, you should be able to use the mobile version quite easily.
If I was looking for a free, lightweight photo editor for my phone, I would take this URL, open it in Safari on my phone and then add the URL to the home screen so the icon could be there for quick, easy access.