Local · Private · Free

Image Upscaler

Enlarge any image 2x, 3x, 4x or to a custom size with progressive resampling and gentle sharpening. Faithful to your pixels, processed entirely on your device. No upload, no watermark, completely free.

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Drop an image here
or click to browse: JPG, PNG, WebP, GIF

Files never leave your browser

Upscale factor

Target width (px)

Target height (px)

Lock aspect ratio

Sharpening (unsharp mask)20%

Crisps up edges after enlarging. 0% = pure resample.

Denoise-lite (soft pre-pass for noisy JPGs)

Export format

Quality92%

Output is over 8000 px on a side. Processing may be slow and some devices can run out of memory. Consider a smaller target.

Original image, enlarged without smoothing

Original pixels Upscaled

In: , Out: , processing…

Drag the divider to compare (or focus it and use arrow keys). Left side shows the raw original pixels enlarged. Right side is the resampled and sharpened result.

Honest upscaling: no invented detail

This tool uses multi-step progressive resampling (repeated high-quality 2× passes) plus an optional unsharp mask, the same technique print shops have trusted for years. Unlike AI upscalers it never hallucinates faces, text or textures that were not in your photo. Edges stay smooth and faithful to the original. Everything runs on your own device with the native canvas: no upload, no queue, no watermark, completely free.

About Image Upscaler

Image Upscaler is a free, private tool that runs entirely in your web browser. Enlarge images 2x, 3x or 4x (or to a custom pixel size) with high-quality progressive resampling and smart sharpening, fully on-device. Because everything happens locally, your files are never uploaded to a server, there is no sign-up or installation required, and it keeps working offline. Like every free online tool by Digital Heroes, Image Upscaler is 100% free with no limits.

What you can do

Upscale 2x, 3x or 4x with one click using the factor buttons.

Set a custom output size by entering a target width or height in pixels.

Lock aspect ratio so width and height scale together automatically.

Sharpen edges with the unsharp mask slider (0 to 100%).

Reduce JPG noise before enlarging with the optional denoise pre-pass.

Export as PNG, JPG or WebP and set the quality level before downloading.

How to use Image Upscaler

Open Image Upscaler. It runs entirely in your browser with no signup.

Drop or browse for your image (JPG, PNG, WebP or GIF). It never leaves your device.

Pick a scale factor (2x, 3x, 4x or custom) and adjust sharpening to taste.

Click Download upscaled. Your result is free and your data stays on your device.

Frequently asked questions

Is Image Upscaler free?

Yes. Image Upscaler is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Image Upscaler runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. This tool is a Progressive Web App. Once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does Image Upscaler do?

Enlarge images 2x, 3x or 4x (or a custom size) with high-quality progressive resampling and smart sharpening, fully on-device.