What is the maximum upscale factor?

You can upscale images 2x or 4x their original size. For a 500x500px image, 2x gives 1000x1000px and 4x gives 2000x2000px.

Will upscaling reduce image quality?

The tool applies sharpening and edge enhancement to minimize quality loss. Results are best when starting from a reasonably sharp source image.

Is there a file size limit?

No server-imposed limit. Large images may take more time to process depending on your device. Images up to 10MP work well.

Image Upscaler - Enlarge Images 2x or 4x Free

Q: How does the image upscaler work?

The tool uses bicubic interpolation combined with a sharpening filter to enlarge images while preserving details and edges. It runs entirely in your browser.

Enlarge images 2x or 4x with high-quality bicubic interpolation and edge-preserving sharpening. Runs 100% in your browser — no upload, no account, fully private.

No Upload 100% Private Free

Drop your image here

JPG, PNG, or WebP supported

How the Image Upscaler Works

Upload Your Image

Select a JPG, PNG, or WebP image. It stays on your device — nothing is uploaded.

Choose Scale Factor

Select 2x or 4x upscaling. The tool uses bicubic interpolation with edge-preserving sharpening.

Download Result

Download the upscaled image as a high-quality PNG.

Frequently Asked Questions

How does the image upscaler work?

The tool uses bicubic interpolation to enlarge your image, followed by an unsharp mask filter to restore sharpness and enhance edges — all running in your browser.

What is the maximum image size I can upscale?

There is no hard limit, but very large source images (over 10MP) may take longer to process and require more memory. For 4x upscaling, we recommend starting images under 2000×2000px.

Does upscaling work offline?

Yes. The entire process uses the HTML5 Canvas API and runs locally in your browser with no server needed.

What output format is used?

The result is always saved as PNG to preserve maximum quality after upscaling.