Irfanview is free and very capable, does batch editing if you wanted to downsize whole groups. Renames new versions and leaves the originals untouched.
I use it often for quick edits, websize and for emails. And for those who already have Irfanview, F12 opens Paint, which is built into the software. Small editor, but useful for adding or minor editing. Irfanview has many automated features like color correction. Easy crop and save as...
IrfanView download? Nobody want to download to their cell phones. Don't understand why not online free use. Worldwide daily usage. Popular daily ad revenue stream. Do not understand business model?