Which model runs behind the scenes?

ESRGAN-slim from UpscalerJS (MIT-licensed) via TensorFlow.js. Multiple scale factors (2×, 3×, 4×, 8×) are supported.

Pick 'AI 4×' with a 2K source, or 'AI 8×' with anything. You can also target dimensions directly — the tool computes the best scale for you.

Why does it take a while?

AI upscaling is compute-heavy. Every 2×2 patch runs through a neural network — expect ~10-60 s per image on a modern laptop. Use 'Fast bicubic' when you just need a quick enlargement.

Is anything uploaded?

No — the model runs entirely in your browser via TensorFlow.js. Photos never leave your device.

Image Tools

Image Upscaler

Enlarge photos to 4K or 8K with AI, or use fast bicubic for instant results. Single and bulk modes.

Drop an image to upscale

JPG, PNG, WebP — smaller sources upscale fastest

Choose image

Nothing uploaded · MIT-licensed ESRGAN model

Frequently Asked Questions

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Image Upscaler

Frequently Asked Questions

Which model runs behind the scenes?

How does 8K work?

Why does it take a while?

Is anything uploaded?

Try more tools

Image Cropper

Image Info & EXIF Cleaner

Color Picker from Image

Image Upscaler

Frequently Asked Questions

Which model runs behind the scenes?

How does 8K work?

Why does it take a while?

Is anything uploaded?

Try more tools

Image Cropper

Image Info & EXIF Cleaner

Color Picker from Image