VOLTUTILS

Image Resizer

Resize JPG, PNG, or WebP images locally with aspect-ratio and quality controls.

100% Local Processing

About the Image Resizer

Resize supported images without uploading them to a remote server. The browser draws the source onto an HTML Canvas at the requested dimensions, then exports the result. Adjust width and height, lock the aspect ratio, choose an available output format, and download the new image.

How to resize an image

  1. Select a JPG, PNG, or WebP image from your device.
  2. Set the target width and height, keeping the aspect-ratio lock enabled if you want proportional scaling.
  3. Choose the output format and quality where available, then download the resized file.

Examples and worked results

Thumbnail preparation

Input
A 2400 × 1600 photo resized to 1200 px wide
Result
A proportional 1200 × 800 image

The exact file size depends on the source image, output format, dimensions, and quality setting.

Canvas-based local processing

The selected file is read into the browser and drawn onto an HTML Canvas at the requested dimensions. The result is exported with the browser’s Canvas API, so the source image is not uploaded to a VoltUtils server.

Common use cases

  • Preparing images for web uploads and thumbnails
  • Reducing a photo before attaching it to a form
  • Converting a supported image between PNG, JPEG, and WebP output

Important notes and limitations

  • Upscaling cannot recreate detail that was not present in the source and may look soft.
  • JPEG is lossy, and quality settings affect both visual detail and file size. Transparency can be lost when exporting to JPEG.
  • Supported input formats are JPG/JPEG, PNG, and WebP.

Practical tips

  • Keep the original file and compare the downloaded result at its final display size before replacing it.

Frequently Asked Questions

Are my images uploaded to your servers?

No. Resizing happens locally in your browser on your device.

Will resizing preserve the original quality?

The browser resamples the image, but upscaling cannot restore missing detail and JPEG output is lossy. Keep the original and compare the downloaded result before replacing it.

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