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Image Upscaler

Processed Client Side

Enlarge an image with fast, high-quality resampling at 2×, 3×, or 4×, right in your browser — then drag the slider to compare before and after. Your images are never uploaded.

Input
Output
Add an image to upscale it and compare before / after here.

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About Image Upscaler

This tool runs entirely in your browser. Whatever you paste is processed on your own device and is never uploaded, logged, or sent to any server.

The Image Upscaler enlarges an image and shows you the result next to the original, with a divider you drag to reveal one side or the other. It uses a high-quality canvas resample — the same bicubic-style interpolation a browser applies when it scales an image, run at 2×, 3×, or 4× and encoded to a lossless PNG. It is instant, has no size limit, and never uploads anything: the whole thing runs on a canvas in your browser, so the tool makes no network requests at all. Resampling adds pixels by interpolation rather than inventing new detail, which makes it the dependable choice for line art, diagrams, screenshots of text, UI mockups, and any case where you simply need more pixels at a clean, predictable result.

Key features

  • High-quality bicubic-style resampling at 2×, 3×, or 4×
  • Works on an image of any size, with no download and no wait — the result is effectively instant
  • Drag-to-compare slider with keyboard control — arrow keys nudge the divider, Home and End jump to either edge
  • Before and after are labelled with their exact pixel dimensions, and the result shows its scale factor and PNG size
  • Output is always a lossless PNG, so upscaling never adds a second round of compression
  • Accepts JPG, PNG, and WebP input, up to 30 MB per file
  • 100% private — nothing is uploaded and nothing is downloaded; the work happens entirely in your browser

How to use it

  1. Drop in a JPG, PNG, or WebP image, or click to browse.
  2. Pick a scale — 2×, 3×, or 4×.
  3. Drag the divider on the result to compare the upscaled image against the original at the same display size.
  4. Click Save PNG to download the upscaled image.

Tips & common mistakes

  • Resampling is at its best on diagrams, logos, line art, and text, where there is no lost detail to recover — only pixels to add. For those, 3× or 4× gives a clean, artefact-free enlargement.
  • Upscaling cannot recover information that was never captured. A small photograph comes out larger and smoothly interpolated, not sharper — resampling fills the gaps between pixels, it does not reconstruct texture.
  • The comparison slider renders both images at the same size, so the original looks soft next to the result. That is the point of the view, not a rendering bug — both are shown scaled to the same box.
  • Output is PNG regardless of the input format. If you need a JPG or WebP afterwards, run the saved file through the Image Converter.
  • Chaining runs — upscaling an already-upscaled image — compounds softness. Start from the highest-quality original you have and go straight to the scale you need.
  • For a specific target size rather than a round multiplier, the Image Resizer takes an exact width and height.

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Frequently asked questions

10

Drop in a JPG, PNG, or WebP image, pick a scale — 2×, 3×, or 4× — and the enlarged result appears next to the original with a divider you drag to compare them, plus a Save PNG button to download it.

No. The upscale runs entirely on a canvas in your browser. The tool makes no network requests at all — nothing is uploaded and nothing is downloaded.

It is a high-quality bicubic-style resample — the same kind of interpolation a browser uses when it scales an image, run at your chosen multiplier and saved as a lossless PNG. It adds pixels between the existing ones; it does not invent new texture.

No. Resampling interpolates between the pixels that are already there, so a small image comes out larger and smoothly filled in, not sharper. Detail that was never captured cannot be restored.

Diagrams, logos, line art, screenshots, and UI mockups, where the goal is simply more pixels at a clean result. Photographs enlarge fine too, but expect a smooth interpolation rather than added sharpness.

Only the 30 MB per-file input limit. There is no cap on output dimensions — the resample handles any size, and the result is effectively instant.

Always a lossless PNG, so upscaling never adds another round of compression. If you need JPG or WebP, convert the saved PNG with the Image Converter.

No. There is no quota, no sign-up, and no watermark. The work runs on your own hardware, so there is nothing to meter.

Yes, completely. Once the page has loaded, the upscale needs no network connection.

The Image Upscaler enlarges by a round multiplier (2×, 3×, 4×) and shows a before/after comparison. The Image Resizer targets an exact width and height, a preset, or a percentage, and can also shrink images and cap the file size.