Free Online Image Resizer

Resize JPG, PNG and WebP images to exact pixels, centimeters, millimeters or inches. Set DPI for physical sizes, keep the aspect ratio, and resize directly in your browser.

Upload Image

or drag & drop a JPG, PNG or WebP image here

Image resizing is performed in your browser. The selected image is not uploaded to LevoTools for this resizing process.

How to Resize an Image Online

  1. 1. Upload an imageChoose a JPG, PNG or WebP file from your device.
  2. 2. Choose the resize methodUse Dimensions for an exact size or Percentage for proportional scaling.
  3. 3. Set the targetChoose px, cm, mm or inches. For physical units, enter the DPI required by your workflow.
  4. 4. Resize and downloadReview the resulting pixel dimensions, choose the output format and download the resized image.

Resize Images by Pixels, CM, MM or Inches

Use pixels when a website or form gives an exact digital width and height. Use centimeters, millimeters or inches when the requirement is stated as a physical print size. Percentage mode is useful when you simply want to scale the whole image proportionally.

UnitUseful forDPI needed?
Pixels (px)Websites, forms and exact digital dimensionsNo
Centimeters (cm)Print, documents and physical photo sizesYes
Millimeters (mm)Small document and photo specificationsYes
InchesPrint sizes given in inchesYes
PercentageSimple proportional scalingNo

How DPI Affects CM, MM and Inch Sizes

A physical size does not map to one fixed number of pixels until a DPI value is known. This tool defaults to 300 DPI because it is a common print-quality choice, but you should use the DPI specified by your form, printer or document requirement whenever one is provided.

Inches: pixels = inches × DPI

CM: pixels = cm × DPI ÷ 2.54

MM: pixels = mm × DPI ÷ 25.4

Pixel results are rounded to the nearest whole pixel.

Requested sizeDPIResult
3.5 × 4.5 cm300413 × 531 px
35 × 45 mm300413 × 531 px
2 × 2 inch300600 × 600 px
10 × 10 cm3001181 × 1181 px

When you resize by cm, mm or inches, JPG and PNG downloads include resolution metadata that matches the selected DPI. For WebP, DPI is used to calculate the pixel dimensions, but embedded print-resolution metadata is not promised.

Keep the Aspect Ratio and Image Quality

Avoid stretching

Aspect ratio is locked by default. For example, a 1600 × 1200 px image resized to 800 px wide becomes 800 × 600 px. Unlocking width and height lets you enter independent values, but mismatched proportions can stretch the image.

Be careful with upscaling

Reducing dimensions generally works cleanly because fewer pixels are needed. Enlarging an image does not recreate missing detail, so large upscales can look softer or pixelated. The tool warns you before processing an output larger than the original pixel dimensions.

Resize JPG, PNG and WebP Images

Keep the original format or choose a different output when needed. Resizing changes dimensions; converting formats changes how the image is encoded.

FormatWhat to know
JPGGood for photos. JPG does not support transparency, so transparent areas are filled with white.
PNGPreserves transparency and uses lossless image encoding, though files can be larger.
WebPEfficient web format with transparency support. Physical-unit sizing uses DPI for the pixel calculation.

Need a format-only conversion? Use PNG to JPG or JPG to PNG.

Resize vs Compress vs Crop

These jobs are related, but they solve different requirements. Use the tool that matches what the form or workflow is actually asking you to change.

TaskWhat changesUse
ResizeWidth and heightImage Resizer
CompressKB/MB file sizeImage Compressor
CropWhich part of the image remainsCrop Image

Example: if a form asks for 300 × 300 px and under 50 KB, resize the dimensions here first, then use Image Compressor for the file-size limit.

Frequently Asked Questions

What DPI should I use when resizing in cm, mm or inches?
Use the DPI required by your form, print workflow or document specification. If no DPI is given, 300 DPI is a common print-quality choice. The tool uses that value to convert the physical size to pixels; JPG and PNG downloads also receive matching resolution metadata.
How do I resize an image without stretching it?
Keep Aspect ratio locked. When you change the width, the height is calculated from the original proportions, and the same happens in reverse. Unlock the ratio only when you intentionally need independent width and height values.
Does resizing an image also reduce its KB size?
Often, but not to a predictable target. Resizing changes pixel dimensions, while file size also depends on the format, image content and encoding. If a form requires an exact limit such as 50 KB or 100 KB, use the Image Compressor after resizing.
Can I enlarge a small image without losing quality?
You can enlarge it, but resizing cannot recreate detail that is not present in the original pixels. Large upscales may look softer or more pixelated, so the tool shows a warning when the requested output is larger than the source image.
Can I resize JPG, PNG and WebP images?
Yes. You can keep the original format or download as JPG, PNG or WebP. PNG and WebP can preserve transparency. JPG cannot, so transparent areas are filled with white when JPG is selected.
What is the difference between resizing and cropping?
Resizing changes the image dimensions. Cropping removes part of the image to change the framing or composition. If you need to remove outer areas rather than scale the whole image, use Crop Image.

Need document-specific photo framing instead of general resizing? Use Passport Photo Maker. For application signatures, use Signature Resizer.