Browser-local image utility

Image Toolbox

Resize, compress, and convert PNG, JPEG, and WebP images in your browser. No upload needed for this browser-local tool.

Files stay on your device for supported local converters. No upload needed for browser-local tools.

Inputs are not stored by Useful Atlas. Source and output previews are released when you leave or reset the page.

Local image workflow

Prepare an image for the web

Choose a file, set the output dimensions and format, then download the converted image.

No upload
1

Choose an image

PNG, JPEG, or WebP. Maximum 40 MB and 40 megapixels.

Choose an image to begin.

2

Set the output

Keep the original dimensions to compress only.

WebP supports transparency and often produces smaller web images.

What the browser does

The browser decodes the selected raster image, redraws it to a local canvas at the requested dimensions, and encodes a new PNG, JPEG, or WebP file. The page does not need an account or a tool-specific network request.

Use JPEG for photographs without transparency, WebP for flexible web output, or PNG when lossless pixels and transparency matter. Always inspect the preview and downloaded file before replacing an original asset.

Processing limits

  • Input: PNG, JPEG, or WebP up to 40 MB and 40 megapixels.
  • Output: Up to 12,000 px per side and 40 megapixels.
  • Metadata: EXIF data is not copied to the new file.
  • Animation: Only the first rendered frame is converted.

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FAQ

Does Image Toolbox upload my file?

No upload needed for browser-local tools. Files stay on your device for supported local converters, and inputs are not stored by Useful Atlas.

Which image formats can I use?

The tool accepts PNG, JPEG, and WebP input and can create PNG, JPEG, or WebP output. Browser codec support controls the final encoding.

Can I compress an image without resizing it?

Yes. Keep the original width and height, choose JPEG or WebP, and adjust quality. PNG uses lossless encoding and does not use the quality slider.

Why can the converted image be larger?

File size depends on the image content, dimensions, output format, and quality. PNG can be larger for photographs, while high-quality JPEG or WebP output can also exceed an already optimized source.

Does the output keep EXIF metadata or animation?

No. The canvas conversion does not preserve EXIF metadata. Animated images are converted from the first rendered frame.