Can I resize an image without stretching it?

Yes. Enable the "Lock Aspect Ratio" option and the height will automatically adjust to match your width (or vice versa) to prevent distortion.

What is the maximum size I can resize to?

There is no hard maximum, but very large output dimensions will produce large files. Browsers handle up to several thousand pixels reliably.

Does resizing reduce image quality?

Making an image smaller reduces file size and detail. Enlarging an image beyond its original size can cause blurriness since no new detail is added.

Can I resize multiple images at once?

For batch resizing, use the Bulk Resize tool which lets you resize many images simultaneously.