How to Batch Resize Images Without Uploading a Folder

Resizing one photo is easy. Resizing 80 photos consistently is where desktop dialogs, filename collisions and upload limits start wasting time. The trick is to decide which rule the whole batch should obey before touching the files.

Maximum edge for galleries and general web use

“Limit longest edge” keeps every image's aspect ratio. A 4000 × 3000 landscape and a 3000 × 4000 portrait both fit inside a 2000-pixel boundary. Smaller images stay small unless you explicitly allow upscaling. This is the safest default for mixed photo sets.

Exact dimensions for cards and marketplaces

Exact mode creates one predictable canvas for every result. In the batch image resizer, choose how the source reaches it:

• Contain shows the complete image and fills unused canvas space.
• Cover fills the frame and crops equally from the overflowing sides.
• Stretch fills the frame by changing proportions; use it only when distortion is acceptable.

Transparency changes the background decision

PNG and WebP can preserve transparent areas. JPEG cannot, so those pixels need a color. Pick the intended page or catalog background instead of discovering black or white boxes after publishing.

Keep the batch easy to audit

Convert locally, check the reported output dimensions, inspect one portrait and one landscape result, then download the ZIP. Browser-local processing avoids sending a client folder to a third party and removes the wait for upload and re-download. If file weight also matters, follow resizing with the image compressor rather than shrinking quality first.