What is Bulk Image Optimizer?
Optimizes a batch of photos for your blog or online store in one go. Set the maximum size of the long edge, the output format (JPG, WebP, AVIF, PNG) and quality, and high-performance encoders like mozjpeg and libwebp shrink them dramatically.
How to use
- 1
Select all the images to optimize.
- 2
Set the maximum size, output format and quality.
- 3
Press “Optimize” and download the results as a ZIP.
Use cases
Blog uploads
Shrink 30 phone photos to 1600px WebP for faster pages.
Product detail images
Batch-convert product photos to standard-size JPGs.
FAQ
Which format is the smallest?+
AVIF is usually the smallest, followed by WebP and then JPG. If compatibility matters, JPG or WebP is recommended.
Are my files uploaded to a server?+
No. Everything is processed in your browser and files are never uploaded anywhere.