HEIC to JPG: Quality, Metadata, and Privacy
A careful HEIC-to-JPG workflow preserves the picture you need without accidentally sharing location data or repeatedly degrading the image.
Read guide →Image Comparator
Compare two images with a before/after slider, an onion-skin blend, and a pixel-difference heatmap using local browser processing.
Image A · before
Drop image A or browse
Tip: select two images to fill both
Image B · after
Drop image B or browse
Tip: select two images to fill both
Reviewed 2026-07-10
About Image Comparator
Image Comparator is part of the Miscellaneous collection. It runs in the browser so you can complete the task without installing desktop software or sending the selected files to opentools for processing.
The interactive controls above operate on the files held by the current browser tab. The result is created as a new download; the original file on your device is not overwritten.
How to use it
- Add your image. Choose a supported image file from your device or drag it into the tool.
- Review the settings. Adjust the available options and use the preview or page visualizer when the tool provides one.
- Process and download. Run the action, inspect the result, and download the newly generated file.
Useful for
- Complete a image comparator task without installing a dedicated application.
- Process sensitive image files locally instead of uploading them to an online conversion queue.
- Create a separate output while keeping the original source file unchanged.
Limitations
- Available formats and features depend on the decoding, canvas, and file APIs supported by the current browser.
- Very large files can exceed the memory available to a browser tab, particularly on mobile devices.
- Always inspect an important output before deleting or archiving the original file.
Questions and answers
Are files uploaded when I use Image Comparator?
No. The file-processing path runs in the current browser tab. Normal website hosting and privacy-respecting analytics requests may still occur, but the selected files are not uploaded to opentools.
Does the tool modify my original file?
No. Browsers cannot silently overwrite the source file. The tool creates a separate result for you to download.
Can I use it on a phone or tablet?
Yes in a modern browser, although large files may be limited by the device memory available to the browser tab.
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Guides related to Image Comparator
PNG vs JPG vs WebP vs AVIF: Which Format Should You Use?
There is no universally best image format: photographs, interface graphics, archives, and web pages have different requirements.
Read guide →How to Compress Images for the Web Without Visible Quality Loss
The best web-image optimisation combines right-sized pixels with a suitable format and a quality setting tested on real content.
Read guide →