Best Image Dimensions for Online Forms and Social Media Platforms (2026 Master Guide)

Understanding Pixels, Centimeters & DPI

When submitting documents digitally or preparing graphics for the web, choosing the right physical dimensions and digital resolution is critical.

- Pixels (px): The fundamental unit of digital screens. A photo of 600x600 pixels contains 360,000 distinct color points. - Centimeters (cm) & Millimeters (mm): Physical measurement units used for printed passports, identity cards, and official forms. - DPI (Dots Per Inch): The link between digital pixels and physical print. For standard high-quality printing, 300 DPI is universally required. For example, a 3.5 cm x 4.5 cm photo at 300 DPI equates to roughly 413 x 531 pixels.

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Competitive Exams Dimensions Reference Table

| Exam Authority | Document Type | Dimensions (Pixels) | Dimensions (Physical) | Aspect Ratio | | :--- | :--- | :--- | :--- | :--- | | SSC Portals | Candidate Photograph | 350 x 450 px | 3.5 x 4.5 cm | 7 : 9 | | SSC Portals | Signature | 140 x 60 px | 4.0 x 2.0 cm | 7 : 3 | | UPSC CSE / NDA | Photograph | 350 x 350 px (Min) | Square | 1 : 1 | | UPSC CSE / NDA | Signature | 350 x 350 px (Min) | Square or 7:3 | Flexible | | IBPS Banking | Photograph | 200 x 230 px | 3.5 x 4.5 cm | 20 : 23 | | IBPS Banking | Signature | 140 x 60 px | 3.5 x 1.5 cm | 7 : 3 | | NTA (NEET / JEE) | Postcard Photo | 4 x 6 inches | 10.16 x 15.24 cm | 2 : 3 |

Need to resize to these exact dimensions? Use our Online Image Resizer to set width and height in px, cm, or inches instantly.

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International Passport & Visa Photo Dimensions

| Country / Document | Dimensions (Inches / mm) | Pixels at 300 DPI | Background Requirement | | :--- | :--- | :--- | :--- | | India Passport & OCI | 3.5 x 4.5 cm (35 x 45 mm) | 413 x 531 px | Plain White / Off-White | | US Visa (DS-160) & Passport | 2 x 2 inches (51 x 51 mm) | 600 x 600 px | Strict White | | Schengen Visa (Europe) | 35 x 45 mm | 413 x 531 px | Light Grey or Plain White | | UK Visa & Passport | 35 x 45 mm | 413 x 531 px | Cream or Light Grey | | Canada Passport | 50 x 70 mm | 590 x 826 px | Pure White |

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2026 Social Media Image Dimensions Reference

- YouTube Video Thumbnail: 1280 x 720 px (16:9 ratio, min width 640 px) - Instagram Square Post: 1080 x 1080 px (1:1 ratio) - Instagram Portrait Post: 1080 x 1350 px (4:5 ratio) - Instagram Story / Reel: 1080 x 1920 px (9:16 vertical) - LinkedIn Profile Photo: 400 x 400 px - LinkedIn Company Banner: 1128 x 191 px - Twitter / X Header: 1500 x 500 px