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ZeroToolbox

AI Image Upscaler

Upscale images for free with AI. Enlarge photos 2× or 4× and get sharp detail instead of blur, with colours left as they are. Runs in your browser, so your images are never uploaded.

  • Free
  • No sign-up
  • Nothing is uploaded

Related tools

Key Features

  • Enlarges images 2× or 4× with Real-ESRGAN, which redraws edges and textures instead of stretching pixels
  • Keeps colours and brightness exactly as they are; only size and detail change
  • Removes the JPEG blocks and noise that a plain enlargement would make bigger
  • Sharpens small faces with GFPGAN, which you can turn down or off
  • Works with JPG, PNG, WebP and HEIC, including screenshots and images saved from the web
  • No upload, no sign-up, no watermark and no daily limit

How to Use

  1. 1Add an image: drop it on the box, choose it, or paste it with Ctrl+V.
  2. 2Wait while the AI rebuilds the detail. The first time, the tool downloads its AI models once (about 20 to 30 MB, plus 85 MB if the image has faces).
  3. 3Drag across the image to compare a plain enlargement with the AI result.
  4. 4Choose 2× or 4× and click "Download larger image".

Your privacy

Most upscaling sites send your images to their servers. Here the AI runs inside your browser, on your own computer or phone, so your images never leave your device.

Frequently Asked Questions

How do I upscale an image without losing quality?

Add the image above. The AI enlarges it 4× and rebuilds edges and textures at the new size, so it looks sharp instead of blurry or blocky. Choose 2× or 4× and download it, free and with no watermark.

How large can the result be?

Images up to about 1,000 × 1,000 pixels can be enlarged 4×, and images up to about 2,000 × 2,000 pixels 2×. Larger images keep their size and get the rebuilt detail, because the AI works in your device's memory.

Does it work on drawings, logos and anime?

Yes. The AI was trained on photos, but it also gives clean edges on drawings, logos and screenshots. Colours stay exactly as they are.

What is the difference from the photo enhancer?

The upscaler only changes size and detail. The photo enhancer also corrects dull colours, flat light and noise.

Is my image uploaded?

No. Everything happens on your device, and your images never leave it.