JustResizeIt! just resizes pictures.
Resizing pictures is what most people do.
Few of us edit pictures: crop them, adjust brightness or constrast, remove red eyes, apply filters or effects and save them in other formats.
If you need any of those features there is a rich collection of software tools you may choose from. Some of them are even free!
JustResizeIt!+ creates static HTML galleries.
Static HTML galleries can be open with any browser and don't need a web server. You can carry them with you to show them on virtually any device. You can upload them to any cloud or you can keep them privately on your NAS.
Real image gallery on any device.
JustResizeIt!+ creates a simple static HTML gallery by just a drag and drop. Additional images can be added at any time.
Static HTML gallery can be served from any device. A webserver is not needed, the gallery index.html can be directly opened by any browser. Static HTML gallery can be served from any USB stick, smartphone and NAS.
See examples in Tips & Tricks: Simple galleries