Image Resizer (CM, Inches, Pixels)

Resize your images online to any custom width and height. Support for Pixels (px), Centimeters (cm), Inches (in), and Millimeters (mm) with aspect ratio lock and DPI settings.

Resize Settings

Select Image to Resize

Drag & drop or click to upload

Interactive Preview

Upload an image to see the crop and resize preview.

Online Image Resizer - Resize Photo to cm, mm or px

Need to resize your photograph or scanned documents to match official exam requirements? Our online Image Resizer makes it simple to change image dimensions to exact values in centimeters, millimeters, or pixels.

Ideal for preparing passport photos, signature uploads, and identity cards for online portals.

Key Reference & Specifications Table

UnitWidth RangeHeight RangeBest Use Case
Centimeters (cm)0.5 cm - 50.0 cm0.5 cm - 50.0 cmPassport and Visa photo sizing
Millimeters (mm)5 mm - 500 mm5 mm - 500 mmOfficial document specifications
Pixels (px)10 px - 5000 px10 px - 5000 pxWebsite and upload portal grids

How to Use the Online Online Image Resizer

  1. Upload your photo or image into the resizer window.
  2. Choose your dimension unit (cm, mm, or pixels).
  3. Input the desired width and height values (e.g. 3.5 x 4.5 cm).
  4. Use the crop and zoom controls to align, then download your image.

Frequently Asked Questions (FAQs)

How do I resize an image to 3.5 x 4.5 cm?

Upload your photo, select 'cm' as the unit, input 3.5 for width and 4.5 for height, adjust the frame inside the preview, and download the resized image.

Does this tool preserve the aspect ratio of my photo?

Yes. You can toggle the aspect ratio lock. When locked, changing the width will scale the height proportionately, preventing distortions.

Is my uploaded image safe from leaks?

Yes. All cropping and scaling calculations happen in your browser using HTML5 Canvas. We do not store or transmit your photos.

What is the standard pixel size for a 3.5 x 4.5 cm photo at 300 DPI?

At 300 DPI, a 3.5 x 4.5 cm photo corresponds to 413 x 531 pixels.

Can I resize signatures for online forms?

Yes. You can input standard signature dimensions (like 140 x 60 pixels or 3.5 x 1.5 cm) to resize signatures instantly.

Does resizing reduce the quality of my photo?

Resizing down (making an image smaller) preserves clarity. Resizing up (stretching an image) will make the output look pixelated or blurry.

What formats can I upload to the resizer?

You can upload JPG, JPEG, PNG, and WEBP formats. The tool will output optimized JPEGs.

Can I rotate or zoom my image during resizing?

Yes, our editor includes zoom sliders and rotation controls so you can align your face before saving.

Does it work on mobile phones?

Yes, our resizer is fully responsive and runs on any smartphone browser.

How can I check the file size (KB) after resizing?

The downloaded file size will be shown in your system directory. You can also run it through our Image Compressor to target specific KB limits.