Unsparkle
★ Open source
Free · No sign-up · Runs on your device

Upscale images to
HD & 4K with AI.

Drop an image and choose HD 2× or 4K in the editor. The AI adds real detail instead of blur, and you can compare normal enlargement with the AI result anywhere in the picture.

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Finds every logo

Scans every size and position, catches a second logo left over from an earlier edit, and cleans every frame of a video.

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Restores the real pixels

Reverses the overlay mathematically, then blends any leftovers into the background around them.

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AI upscale to 4K

Real-ESRGAN running in your browser adds real sharpness instead of blur.

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Save your changes?

You edited this image. Save the changes before going back to all images?

How to upscale an image to 4K

  1. Drop your imageDrop a photo, AI image or illustration on the upload box.
  2. Pick Photo or Art and the sizeChoose 📷 Photo for real photos or 🎨 Art / Anime for drawings, then HD 2× or 4K. You will see how long it will take before it starts.
  3. Compare and downloadWatch it sharpen tile by tile, compare with the slider and zoom, then download.

Frequently asked questions

Is the AI upscaler free?

Yes, free with no account, no watermark and no limits.

Which AI is used?

Real-ESRGAN, a well-known open-source upscaler, with a model for photos and one for art and anime.

Are my images uploaded?

No. Upscaling happens in your browser and your images stay on your device.

How long does 4K take?

From a few seconds with a graphics card to a few minutes on a slow computer. The time is shown before you start and you can cancel at any moment.

Does it work on phones?

Yes, with a size limit that fits the phone’s memory so the page does not crash.