Online DPI Converter

Change image DPI resolution to 150, 200, 300, or 600 DPI instantly without altering the pixel dimensions. 100% secure, browser-side metadata converter.

Convert DPI

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Upload a photograph or signature to configure the DPI settings.

Online DPI Converter - Convert cm/inches to Pixels

Government exam portals like SSC, UPSC, and IBPS frequently require photos and signatures with exact pixel counts at 300 DPI or 200 DPI. Our online DPI Converter helps you calculate the correct pixel dimensions based on the required physical size in centimeters or inches, ensuring your photos aren't rejected.

DPI (Dots Per Inch) determines the density of pixels in a printed inch. Higher DPI values mean sharper images and larger pixel dimensions.

Key Reference & Specifications Table

Physical Size (cm)Target DPIPixel Dimensions (Width x Height)Best Use Case
3.5 x 4.5 cm300 DPI413 x 531 pixelsStandard Passport Photo (High Res)
3.5 x 4.5 cm200 DPI276 x 354 pixelsStandard Passport Photo (Medium Res)
3.5 x 1.5 cm300 DPI413 x 177 pixelsOfficial Signature Size
5.1 x 5.1 cm (2"x2")300 DPI600 x 600 pixelsUS Visa / Indian Visa Photo

How to Use the Online DPI Converter

  1. Enter the physical width and height in centimeters (cm) or inches.
  2. Select your target resolution (DPI) from the dropdown (e.g. 300 DPI).
  3. The tool calculates the required pixel dimensions automatically.
  4. Use the outputs to configure your image editing software.

Frequently Asked Questions (FAQs)

What is DPI in digital images?

DPI stands for Dots Per Inch, representing the resolution of an image when printed. In screen displays, it is equivalent to PPI (Pixels Per Inch).

How do I convert centimeters to pixels using DPI?

Use the formula: `Pixels = (Centimeters / 2.54) * DPI`. For example, 3.5 cm at 300 DPI is `(3.5 / 2.54) * 300 = 413` pixels.

Why does SSC specify 300 DPI for uploads?

A resolution of 300 DPI ensures that the candidate's photo and signature are sharp and legible on printed admit cards and marks sheets.

What is the pixel size of a 3.5 x 4.5 cm photo at 200 DPI?

At 200 DPI, the pixel dimensions for a 3.5 x 4.5 cm photo are 276 x 354 pixels.

How can I change the DPI of my image?

You can change the DPI of an image using image resizer tools or desktop editors like Photoshop by adjusting the resolution settings without altering the image contents.

What is the standard DPI for web displays?

The default standard web resolution is 72 DPI or 96 DPI, while high-definition prints require 300 DPI or higher.

How to convert pixels back to centimeters?

Use the formula: `Centimeters = (Pixels / DPI) * 2.54`.

Does converting to a higher DPI increase my image quality?

No, raising the DPI of a low-resolution image only makes the file size larger without adding detail. Always start with a high-resolution source photo.

What is the standard DPI for scanning documents?

For textual documents, 150 to 200 DPI is sufficient. For photos and signatures, scan at 300 DPI to maintain clarity.

Is this DPI Converter free to use?

Yes, our converter is completely free and works offline in your web browser.