HeroTools / Image
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.

⤢
Drop an image here
or click to browse — JPG, PNG, WebP, GIF
🔒 Files never leave your browser
20%
Crisps up edges after enlarging. 0% = pure resample.
92%
⚠ 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 (or use arrow keys on it) to compare. Left side shows the raw original pixels enlarged; right side is the resampled + 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 image tool that runs entirely in your web browser. Enlarge images 2×–4× with high-quality resampling & smart sharpening — fully on-device. Because everything happens locally on your device, your files and data are never uploaded to a server, there is no sign-up or installation required, and it keeps working offline. It is handy for image upscaler, enlarge image, upscale photo, increase resolution. Like every HeroTool by Digital Heroes, Image Upscaler is 100% free with no limits.

How to use Image Upscaler

  1. Open Image Upscaler — it runs entirely in your browser, with no signup.
  2. Drag and drop your file (or click to browse) — it never leaves your device.
  3. Adjust the options to match exactly what you need.
  4. Copy or download your result — it 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. HeroTools 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 2×–4× with high-quality resampling & smart sharpening — fully on-device.

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