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Core Concepts Demystified

Pixels vs KB vs DPI vs CM – What Your Form Means

The ultimate guide to decoding image measurements. Learn the difference between screen resolution, file storage size, print dimensions, and density tags.पिक्सेल, केबी (KB), डीपीआई (DPI) और सेंटीमीटर (CM) में क्या अंतर है — सरल हिंदी व अंग्रेज़ी में समझें।

UnitWhat It Actually MeasuresPlain English AnalogyCommon Usage
Pixels (px)Digital Resolution (e.g. 200 × 230 px)Width & height in screen dotsSBI, IBPS, UPSC, Web
Kilobytes (KB)File Storage Weight (e.g. 20–50 KB)How much space file takes on serverAll Online Forms
Centimeters (cm)Physical Print Dimensions (e.g. 3.5 × 4.5 cm)How large it prints on paperPassport, Driving Licence
DPI (Dots Per Inch)Print Density Metadata (e.g. 200 / 300 DPI)How densely dots are packed on paperPAN Card, PSK Passport

Which Setting Does Your Application Form Want?

1
Form says: “File size must be between 20 KB and 50 KB”

This is asking for KB (storage size). Use our KB Resizer.

2
Form says: “Dimensions: 200 × 230 pixels”

This is asking for Pixels (screen resolution). Use our Pixel Resizer.

3
Form says: “Photo size: 3.5 cm × 4.5 cm at 200 DPI”

This is asking for Centimeters & DPI (print dimensions). Use our CM Resizer.

Always Set Dimensions First, Then KB

When an exam portal specifies BOTH (e.g., “200 × 230 pixels AND under 50 KB”), always set the pixel dimensions first, and then optimize the compression quality to land under 50 KB. Our dedicated exam presets do this automatically!

Image Units – FAQ

No. Pixels measure visual resolution (width × height dimensions), while KB measures file storage weight on disk (1 KB = 1024 bytes).

सरल हिंदी में समझें:नहीं! पिक्सेल फ़ोटो के आकार (चौड़ाई × ऊंचाई) को नापते हैं, जबकि KB यह बताता है कि फ़ाइल कंप्यूटर या फ़ोन में कितनी जगह लेगी।
D
Devendra Sharma(Technical Guide Author)

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Reviewed by Pooja Verma