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Resize Image

Resize images to exact pixel dimensions with precision control.

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Select Image
or drop your image here
aspect_ratio Aspect Lock high_quality Lanczos

Target Dimensions

Enter one dimension to maintain aspect ratio, or both for exact sizing. DPI is used to convert physical units to pixels.

Processing your file...
This may take a moment depending on file size.
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Processing Complete
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How it works

01

Upload Image

Select the image you want to resize.

02

Set Dimensions

Enter the desired width and height in pixels.

03

Download

Download your resized image in the original format.

About This Tool

JustConvert's Image Resize tool gives you precise control over image dimensions. Enter exact values in pixels, centimetres, millimetres, or inches — specify only one dimension to automatically maintain the aspect ratio, or enter both to force custom sizing. Lanczos resampling ensures the highest quality when downscaling.

Common use cases include resizing photos for social media profile pictures, optimising images for email attachments, preparing visuals for website headers, or printing at a specific physical size. The output format matches your original image format.

  • check_circleResize in pixels, cm, mm, or inches
  • check_circleAuto aspect ratio lock when only one dimension is set
  • check_circleLanczos resampling for sharp downscaling
  • check_circleOutput retains the original image format (JPG, PNG, WebP)
  • check_circleNo quality degradation beyond the resampling itself
  • check_circleSupports images up to 50 MB

Frequently Asked Questions

How do I resize an image without losing quality? expand_more

Upload your image, enter the target width or height (entering just one preserves the aspect ratio), and click Process. The tool uses Lanczos resampling, which is the highest-quality algorithm for reducing image size.

Can I resize an image to exact pixel dimensions? expand_more

Yes. Enter both width and height values. The image will be stretched or squeezed to match the exact dimensions you specify, which may alter the aspect ratio.

Which unit types are supported? expand_more

You can resize using pixels (px), centimetres (cm), millimetres (mm), or inches. The DPI field allows accurate conversion from physical units to pixels.

Will resizing change the image file format? expand_more

No. The output image uses the same format as the original upload. A JPG stays JPG, a PNG stays PNG.

What is the maximum image size I can resize? expand_more

Files up to 50 MB are supported. Very high-resolution images (20+ megapixels) may take a moment longer to process.