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AI Image Upscaler (4× ESRGAN)

Real AI upscaling — 4× in your browser, no upload, truly unlimited.

  • No upload
  • Browser-based
  • Free
  • No signup
  • Image

Images are processed in your browser and never uploaded.

How to use AI Image Upscaler

  1. Drop or select a photo. Smaller inputs (under 500 × 500 px) upscale in 5–20 seconds on a modern laptop.
  2. First use downloads the AI model (~5 MB, ESRGAN-slim). The browser caches it — subsequent uses skip the download.
  3. Click Upscale 4×. Under the hood, we run the 2× model twice; two passes give sharper photo output than a single 4× jump.
  4. When done, download the 4× larger image. PNG preserves detail losslessly; JPG is smaller.

Common use cases

  • Old family photos. Small, low-res scans from the 90s and early 2000s become sharp enough to print at A4 size after a 4× upscale.
  • Screenshots and profile pictures. Take a 200 × 200 avatar and turn it into an 800 × 800 asset without the blurry rescale look.
  • E-commerce product photos. Enhance existing product images without a reshoot. Great for marketplace sellers whose supplier photos are low-res.
  • Compressed social media saves. Recover detail lost when a photo was compressed by WhatsApp / Instagram / Facebook and re-saved multiple times.

Tips

  • The AI works best on realistic photos. Text and line art may look slightly over-smoothed — for those, use our /resize-image with a large target instead.
  • Very large inputs (over 0.6 megapixel) can take a minute or two. Consider cropping to the region you care about first with /crop-image.
  • Nothing about your image is uploaded. The model runs on your device's GPU (WebGL/WebGPU) with a CPU fallback.
  • The output is exactly 4× the input dimensions. To get 2× only, use a single pass — coming as a toggle later.

Troubleshooting

The upscale takes forever.
AI upscaling is compute-heavy. On a low-end phone, a 1 megapixel image can take 5+ minutes. Try a smaller crop or use a laptop.
The first run pauses on 'Loading model'.
The tiny AI model is being fetched from a CDN. Cached after that — subsequent runs skip this step.

Frequently asked questions

Is my photo uploaded?
No. The AI model runs entirely in your browser using TensorFlow.js. Your photo never leaves your device.
What model does this use?
ESRGAN-slim (via UpscalerJS), an open-source super-resolution model. We run the 2× variant twice for a 4× total upscale — this produces sharper photo results than a single 4× model of comparable size.
Why is the first run slow?
The model (~5 MB) downloads from jsdelivr on first use. The browser caches it — every future use skips the download.
Is there a file size limit?
No hard limit, but processing time grows with pixel count. A 500 × 500 image takes 5–20 seconds; 1000 × 1000 takes 30 seconds to 2 minutes; larger inputs take longer.
Does it use WebGL or WebGPU?
TensorFlow.js picks the best available backend automatically — WebGPU on modern Chrome / Edge, WebGL elsewhere, WASM as a final fallback. All accelerated where possible.