Emerald
Free in-browser AI image upscaler that runs on your own GPU — a private, no-upload alternative to Topaz.
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What is Emerald?
Emerald is a free, in-browser AI image upscaling and restoration tool, positioned as an alternative to Topaz. It enlarges and restores images using models like Real-ESRGAN that run entirely on the user's own GPU in the browser, with no uploads, installation, or subscription.
Emerald pricing
Pricing model: Free
Free
Emerald pros
- Runs entirely in the browser on your own GPU — nothing is uploaded, preserving privacy of images and EXIF data
- Free with no subscription or installation required
- Uses established models such as Real-ESRGAN, with an exact output size selector
- Before/after comparison view with a drag handle
Emerald cons
- Requires GPU hardware acceleration support in the browser
- Models must be downloaded and cached — the VOSR2 bundle is 3.9GB
- Limited to upscaling/restoration; supports JPEG, PNG, and WEBP input
Frequently asked questions about Emerald
Are my images uploaded to a server?
No. All processing runs in the browser tab on your own GPU — pixels and EXIF data never leave your device.
Do I need to install anything?
No installation is needed; model files (2.50–67.08 MB for Real-ESRGAN, or 3.9GB for the VOSR2 bundle) are downloaded and cached in your browser.
Is Emerald free?
Yes, it is a free tool with no cloud queue and no subscription.