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Workbox

Free browser tool

Resize Image for Upload

Paste a rule such as “maximum width 1200 pixels” or replace the example below. Workbox handles the dimensions and verifies the resulting image.

Prepare your image

Set the pixel limits the form requires.

Replace the width example with the form's exact, minimum, or maximum dimensions, plus any file-size limit.

  • No account required
  • File stays on your device
  • Final output is revalidated

Tell us the requirements

Paste the wording from the website, form, or application.

Upload your file

Processed on your device. Your file stays private.

Three clear steps

How it works

  1. 1

    Enter the minimum, maximum, or exact pixel dimensions from the form.

  2. 2

    Choose your image; Workbox calculates a matching size while preserving the intended shape.

  3. 3

    The final file is decoded again to confirm its actual width and height.

Pixel dimensions and file size are different

Dimensions describe the number of pixels, such as 1200 × 800. File size describes storage in KB or MB. A form can enforce either or both.

Workbox treats these as separate requirements and validates each one independently.

Tips for a reliable upload

  • Use “exact 600x600” only when the form explicitly requires an exact size.
  • Use “minimum” for ID-photo rules that allow larger images.
  • Add a ratio such as 1:1 or 4:3 when the destination requires a specific shape.

Frequently asked questions

Can Workbox resize to exact dimensions?

Yes. Enter wording such as “exact 600x600”. Workbox center-crops when needed and validates the final dimensions.

Will resizing stretch my image?

No. Workbox preserves proportions and crops the edges when an exact aspect ratio requires it.

Can I combine dimensions with a KB limit?

Yes. Add both rules in the same requirements box.

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