Start with the requirement that cannot change. Use a target-size compressor when a portal specifies a maximum number of kilobytes, a fixed resizer when exact pixels are required, and a format converter when the receiving website lists accepted file types. Crop before resizing when composition matters, and keep the original until the final download has been checked.

Why browser-based image tools are practical

Local processing reduces waiting time and keeps routine files on the device. It also makes it easy to compare settings, reset the tool and create another version without repeatedly sending the source file across the internet.

Better results begin with the original

Use the clearest source available, avoid repeated conversions, and export only once when possible. Dimensions, format and visual quality work together: reducing unnecessary pixels can preserve more visible quality than forcing a very low compression setting.