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AI Image Upscaler - 4x Enlarge Free

Enlarge photos 4x with AI, right in your browser. No upload, no signup, no watermark. 100% free.

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Drag & drop an image or click to upload

You can also paste with Ctrl+V

Original

Upload an image to start

Result

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Result will appear here

How to Upscale an Image with AI

  1. Upload the image you want to upscale
  2. Click Upscale and let the AI model run in your browser (first run downloads a ~4.6 MB model, then it's cached)
  3. Wait a few seconds while Real-ESRGAN enlarges your image 4x
  4. Download your upscaled image

Why Upscale with AI

What makes this different

  • Uses Real-ESRGAN, a real super-resolution neural network, not simple pixel stretching
  • Runs 100% in your browser via ONNX Runtime Web โ€” your photo never touches a server
  • No account, no credit limits, no watermark on the result
  • Model downloads once (~4.6 MB) and is cached by your browser for instant reuse

Current limits, stated honestly

  • Fixed 4x enlargement only (no 2x or 8x option yet)
  • Input is capped at 640px on the longest side before upscaling, so maximum output is about 2560px on that side
  • A 200ร—150 image becomes 800ร—600 in about 5 seconds, including the one-time model download

Frequently Asked Questions

Is this image upscaler really powered by AI?โ–ผ

Yes. It runs Real-ESRGAN (realesr-general-x4v3), a genuine super-resolution neural network, using ONNX Runtime Web. It is not a simple resize or sharpen filter.

Is my photo uploaded to a server?โ–ผ

No. The AI model runs entirely inside your browser. Your image is processed on your device and never leaves it โ€” unlike most upscaler sites that upload your photo to their servers.

How much can I upscale an image?โ–ผ

This tool applies a fixed 4x enlargement. There's no 2x, 8x, or custom scale option.

Is there a size limit?โ–ผ

The longest side of your input image is capped at 640px before upscaling, so the largest possible output is about 2560px on that side. Larger originals are automatically scaled down to fit before the AI runs.

How long does it take?โ–ผ

About 5 seconds for a small image like 200ร—150, including the one-time ~4.6 MB model download on first use. After that, the model is cached and later upscales start immediately.

Is it free? Do I need an account?โ–ผ

Yes, completely free, no signup, no watermark, and no batch or API limits to buy your way out of.