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Drop one or many images · automatic bulk mode for multiple files
Bulk supported. Drop multiple files and they'll be processed in a queue with a single ZIP download. Same settings apply to every file.
How to use
01
Load the image set
Drop any number of images, up to 50 MB apiece. When you start with a single file, its preview appears and its real dimensions auto-fill the width and height boxes.
02
Pick Exact px, Max edge, or Percent
Exact px forces fixed dimensions, Max edge caps the longest side without upscaling, and Percent scales each image relatively. The Lock aspect ratio switch protects mixed orientations from distortion.
03
Resize and download
Press Resize. Each output keeps its original format and picks up a resized- prefix, and a multi-file run downloads together as resized-images.zip.
Why Bulk Image Resizer
- Single image or hundreds, automatic bulk mode.
- Three modes: exact px, max edge, or percent scale.
- High-quality Canvas resampling. 100% client-side.
Common questions
How do I resize multiple images at once to a uniform 1600px?
Switch to Max edge mode and enter 1600 for both max width and max height. Wide shots come out 1600 across, tall shots 1600 high, and every image keeps its own proportions. That's the standard recipe for a consistent product catalog.
Will the bulk image resizer stretch photos that have different shapes?
Only if you use Exact px with the aspect lock off, because that mode forces every file into the same width and height regardless of shape. For mixed batches, Max edge or Percent are the safe modes since both preserve each image's proportions.
Does Max edge mode upscale the small images in my batch?
No. The scale factor is capped at 1, so an 800 px icon stays 800 px even when the limit is 1600. That's deliberate: blowing small images up in a batch just manufactures blur across your whole set.
What does Percent mode do differently across a batch?
It scales each file relative to its own dimensions, so 50 percent turns a 4000 px photo into 2000 px and a 1200 px photo into 600 px. Use it to lighten a folder proportionally; use the pixel modes when outputs must match each other.
Can I batch resize photos online without them touching a server?
Yes. The resampling runs on a canvas inside your browser with high-quality smoothing enabled, and nothing is transmitted anywhere. Unreleased product shots and embargoed press images stay on your machine the entire time.
Why test one product shot before resizing the entire catalog?
Because a single dropped file shows a preview and loads its native dimensions into the fields, you can sanity-check the output size math in one click. Confirm the sample, then add the rest of the catalog and run the same settings across all of it.
Is the output format changed when images are resized in bulk?
No, a JPG comes back as a JPG and a PNG as a PNG, re-encoded at high quality after scaling. If you also want a format change, run the batch through the Bulk Image Converter after resizing.