Image

How to resize a picture to the dimensions you need

QUICK ANSWER

Choose your images in Resize Image. Read the original dimensions in the preview before changing the width or height. Compare the actual output dimensions before downloading the files or ZIP.

Tooldu Resize Image page showing its upload area and starting controlsView full size
Start on the Resize Image page. The Choose files button opens your device’s file picker.

An image can have the right file size and still be too wide for an upload form. Resize Image changes its pixel dimensions. Start with the width and height the receiving page asks for, rather than a guess based on how large the picture looks on screen.

1. Open your file

Choose your images in Resize Image. Read the original dimensions in the preview before changing the width or height.

2. Work through the settings

  1. Enter the output dimensions you need. Keep the proportions linked when you want the picture to retain its natural shape.
  2. Check the fit choice if the requested box has a different shape from the original. A crop and a stretch have different effects.
  3. Choose a suitable output format, then process the images.
  4. Compare the actual output dimensions before downloading the files or ZIP.
Resize Image on Tooldu with the sample file opened and its working controls visibleView full size
The Resize Image workspace with a sample file. Review these controls before making your download. Sample portrait, where shown: NASA, public domain; no endorsement implied.

3. Check before you share

  • Look at faces, circles and lettering for unwanted stretching.
  • Check that an important edge was not cut off.
  • Verify both pixel dimensions and byte size if an upload form checks both.

File limits and first-use notes

350 MB combined input. 12 images. No fixed pixel / MP upload cap. 350 MB output. Device memory and codec limits apply.

Questions you may have

Does resizing guarantee a particular KB size?

No. Pixel dimensions and encoded file size are separate. Use Resize and Reduce Image when you need to work toward both requirements.

Can I resize several photos together?

The workspace supports a batch within its file-count and combined-size limits. Review pictures with different proportions before using one shared setting.