How to use
- Choose or drop one or more images.
- Select the output format and quality.
- Click Convert images, then download your results.
STACKTOZ IMAGE TOOLS
Convert images in seconds.
Convert JPG, PNG, WebP and AVIF files right in your browser. Your images stay on your device.
Drop images here
or choose files from your device
JPG, PNG, WebP or AVIF • Multiple files supportedWhy StackToZ?
Fast utility software designed around practical workflows. This converter uses browser APIs to process images on your device, without uploading them to a conversion server.
Explore StackToZ software services →Frequently asked questions
Are my images uploaded?
No. Conversion is performed locally in your browser using standard image and canvas APIs.
Can I convert multiple images?
Yes. Add multiple supported images and convert them together. Each result can be downloaded separately or all at once.
Why might AVIF conversion fail?
AVIF encoding support depends on the browser. If your browser cannot encode AVIF through its native APIs, the app will report the issue instead of pretending the conversion succeeded.
Does quality affect PNG?
No. PNG is lossless, so the quality slider is ignored for PNG output.