Does my image get uploaded to upscale it?

No. This is the difference from mainstream upscalers, which send your image to their servers — and usually charge for it. Here the super-resolution model and its engine are downloaded into your browser (a one-time ~18 MB fetch from this site, cached after that) and run on your own device, so the image never leaves your computer and never reaches a server.

How much bigger does the image get?

Exactly 4× on each side — so a 500×500 image becomes 2000×2000, four times the width and four times the height. Because the whole thing runs on your device, very large sources are first scaled down to a size your browser can handle in a reasonable time, then upscaled 4× from there; when that happens you are told the exact size that was processed.

Will it make a blurry or tiny-text photo sharp?

It enlarges and sharpens using a model trained to add plausible detail, so the result looks cleaner than a plain stretch. But it cannot invent detail that was never captured: heavy motion blur, out-of-focus shots, and unreadable tiny text will not become readable. It is best thought of as a high-quality enlarger for photos and illustrations, not a restoration or de-blur tool.

Why does it take a few seconds instead of being instant?

Because it runs entirely on your own device rather than on a server GPU. That is the trade: an online upscaler is faster because it processes on powerful remote hardware — but it has to receive your image first, and most charge for it. Here the work happens locally, so it takes a little longer, your image never leaves your computer, and it is free.

What model does it use?

realesr-general-x4v3, a general-purpose 4× super-resolution model from the Real-ESRGAN project, released under the permissive BSD-3-Clause licence and self-hosted on this site — served from this domain, not a third-party CDN, so no one else learns what you are upscaling.

image

Upscale Image

Increase the resolution of a JPG, PNG, WebP, or AVIF image by 4× without uploading it anywhere — a super-resolution model runs inside your browser, on your device. Great for small photos, thumbnails, and illustrations you need bigger and cleaner. It enlarges and sharpens; it does not invent detail that was never captured. Free, no account, no email.

Frequently asked questions

Does my image get uploaded to upscale it?: No. This is the difference from mainstream upscalers, which send your image to their servers — and usually charge for it. Here the super-resolution model and its engine are downloaded into your browser (a one-time ~18 MB fetch from this site, cached after that) and run on your own device, so the image never leaves your computer and never reaches a server.
How much bigger does the image get?: Exactly 4× on each side — so a 500×500 image becomes 2000×2000, four times the width and four times the height. Because the whole thing runs on your device, very large sources are first scaled down to a size your browser can handle in a reasonable time, then upscaled 4× from there; when that happens you are told the exact size that was processed.
Will it make a blurry or tiny-text photo sharp?: It enlarges and sharpens using a model trained to add plausible detail, so the result looks cleaner than a plain stretch. But it cannot invent detail that was never captured: heavy motion blur, out-of-focus shots, and unreadable tiny text will not become readable. It is best thought of as a high-quality enlarger for photos and illustrations, not a restoration or de-blur tool.
Why does it take a few seconds instead of being instant?: Because it runs entirely on your own device rather than on a server GPU. That is the trade: an online upscaler is faster because it processes on powerful remote hardware — but it has to receive your image first, and most charge for it. Here the work happens locally, so it takes a little longer, your image never leaves your computer, and it is free.
What model does it use?: realesr-general-x4v3, a general-purpose 4× super-resolution model from the Real-ESRGAN project, released under the permissive BSD-3-Clause licence and self-hosted on this site — served from this domain, not a third-party CDN, so no one else learns what you are upscaling.

Frequently asked questions

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