Image Size & Dimensions Calculator
Check image dimensions in pixels, inches, cm, mm - Convert units with DPI calculator
Upload images or use manual calculator to convert between pixels and physical sizes
Upload Images to Check Size
Drag & drop images or click to select
Supports PNG, JPG, WebP, GIF, BMP, SVG
Or Calculate Manually
Calculate image size information or convert between units
Calculated Information:
How to Use the Image Size Calculator
Upload Your Images
Drag and drop images or click to browse. Supports JPG, PNG, WebP, GIF, and more. Upload multiple images at once for batch processing.
View Complete Information
Instantly see dimensions, aspect ratio, megapixels, file size, format, color space, and DPI for each image.
Use Manual Calculator
Don't have an image file? Use the manual calculator to compute size information by entering dimensions directly.
Check Print Sizes
See recommended print sizes at different DPI levels (72, 150, 300) to determine the best quality for your needs.
What is an Image Size Calculator?
An image size calculator is an essential online tool that instantly reveals all technical specifications of your images. Unlike estimation tools, this calculator analyzes actual image files to display precise information including dimensions (width and height in pixels), file size in megabytes, aspect ratio, megapixels, format type, color space, and DPI settings.
This tool serves as a comprehensive image information viewer, perfect for photographers, web developers, graphic designers, and anyone working with digital images. Whether you need to check if an image meets specific requirements, verify dimensions before uploading, or understand the technical properties of your visual assets, this calculator provides all the data you need in seconds.
The calculator supports all common image formats including JPEG/JPG, PNG, WebP, GIF, BMP, and TIFF. Simply drag and drop your images or click to browse, and receive instant, accurate measurements without any file upload to external servers—all processing happens securely in your browser.
Understanding Image Measurements
Image Dimensions (Width × Height)
Image dimensions represent the pixel count in width and height. For example, a 1920×1080 image has 1920 pixels across and 1080 pixels vertically. These dimensions determine the image's native display size and resolution. Larger dimensions mean more detail and clarity but also larger file sizes. Common web dimensions include 1920×1080 (Full HD), 1280×720 (HD), and 800×600 (standard thumbnail).
Megapixels (Total Pixels)
Megapixels (MP) represent the total number of pixels in an image, calculated by multiplying width by height and dividing by one million. A 1920×1080 image contains approximately 2.07 megapixels. Higher megapixel counts allow for larger prints and more cropping flexibility. Professional photography typically uses 12-50MP, while smartphones range from 8-108MP. However, more megapixels don't always mean better quality—lens quality and sensor size matter equally.
File Size vs Image Size
File size (measured in KB or MB) differs from image dimensions. File size depends on format, compression level, and image complexity. A 1920×1080 JPEG might be 200KB-2MB depending on compression, while the same dimensions as PNG could be 3-8MB. WebP format typically achieves 25-35% smaller file sizes than JPEG with equivalent quality. Understanding this relationship helps optimize images for web performance while maintaining visual quality.
Aspect Ratio Explained
Aspect ratio describes the proportional relationship between width and height, expressed as two numbers (e.g., 16:9, 4:3, 1:1). Common ratios include 16:9 (widescreen video, modern displays), 4:3 (classic TV, some cameras), 1:1 (Instagram square), and 3:2 (DSLR cameras). Maintaining aspect ratio prevents distortion when resizing images. Our calculator automatically identifies your image's aspect ratio and suggests common equivalent ratios.
Common Image Sizes for Different Uses
🌐 Web & Social Media
- • Facebook Post: 1200×630px (1.91:1)
- • Instagram Square: 1080×1080px (1:1)
- • Twitter Header: 1500×500px (3:1)
- • LinkedIn Article: 1200×627px
- • Blog Featured Image: 1200×630px
- • Website Hero: 1920×1080px (16:9)
🖨️ Print & Professional
- • 4×6" Print (300 DPI): 1200×1800px
- • 8×10" Print (300 DPI): 2400×3000px
- • A4 Document (300 DPI): 2480×3508px
- • Business Card: 1050×600px
- • Poster (18×24" at 150 DPI): 2700×3600px
- • Magazine Cover: 2550×3300px
📱 Mobile & Apps
- • iOS App Icon: 1024×1024px
- • Android App Icon: 512×512px
- • Mobile Banner: 320×100px
- • iPhone Screenshot: 1242×2688px
- • App Store Feature: 1024×768px
- • Push Notification: 256×256px
🎬 Video & Display
- • Full HD Video: 1920×1080px (16:9)
- • 4K Ultra HD: 3840×2160px
- • YouTube Thumbnail: 1280×720px
- • Video Cover: 1920×1080px
- • Cinema Widescreen: 2048×858px
- • Standard HD: 1280×720px
Why Image Size Matters
🚀 Website Performance
Large image files slow down page load times, directly impacting user experience and SEO rankings. Google considers page speed a ranking factor, and studies show that 53% of mobile users abandon sites taking over 3 seconds to load. Using properly sized images can reduce load times by 50-70%, improving both user satisfaction and search engine visibility.
💰 Storage & Bandwidth Costs
Oversized images consume unnecessary storage space and bandwidth. For websites with high traffic, serving unoptimized images can cost hundreds of dollars monthly in CDN and hosting fees. An e-commerce site with 1000 products displaying 5MB images instead of 100KB optimized versions wastes 4.9GB per page view—multiply by thousands of visitors and costs skyrocket.
📐 Platform Requirements
Different platforms have specific image size requirements. Facebook recommends 1200×630px for shared links, Instagram prefers 1080×1080px for feed posts, and Twitter displays 1200×675px optimally. Uploading wrong dimensions results in cropped or distorted images. Email marketing platforms often have 1MB file size limits. Knowing your image dimensions ensures content displays correctly across all platforms.
🎨 Print Quality
Print quality depends on DPI (dots per inch) and total pixels. Professional printing requires 300 DPI—a 4×6 inch photo needs minimum 1200×1800 pixels. Using undersized images results in pixelated, blurry prints. Checking image dimensions before sending to print saves costly reprints and ensures professional results. Our calculator shows recommended print sizes at various DPI levels.
Perfect For
📸 Photographers
Verify image megapixels, check if photos meet client specifications, and determine optimal print sizes before sending to labs.
💻 Web Developers
Check image dimensions before uploading to CMS, ensure assets meet responsive design requirements, and optimize for web performance.
🎨 Graphic Designers
Verify export dimensions, check aspect ratios for different deliverables, and ensure client assets meet specifications.
📱 Social Media Managers
Check if images meet platform requirements, verify dimensions before posting, and ensure optimal display quality.
🛍️ E-commerce Owners
Verify product image sizes, ensure consistency across catalog, and check images meet marketplace requirements.
✍️ Content Creators
Check thumbnail sizes for YouTube, verify blog header dimensions, and ensure images work across all publishing platforms.
Frequently Asked Questions
How do I check the size of an image?
Simply drag and drop your image into our calculator or click to browse and select files. The tool instantly displays dimensions (width × height in pixels), file size in MB/KB, aspect ratio, megapixels, format, and DPI. No installation or registration required—everything works directly in your browser.
What's the difference between image size and file size?
Image size refers to dimensions (width × height in pixels), while file size refers to storage space (MB/KB). A 1920×1080 image can have different file sizes depending on format and compression—JPEG might be 200KB, PNG 3MB, WebP 150KB. Our calculator shows both metrics clearly.
How many megapixels do I need?
It depends on usage: Web display needs 0.5-2MP (1920×1080 = 2.07MP), 4×6" prints require 2MP minimum (3MP recommended), 8×10" prints need 6-8MP, and professional large prints benefit from 12-24MP. More megapixels allow larger prints and more cropping flexibility but create bigger files.
What is a good image size for websites?
For web use, 1920×1080px (Full HD) works well for hero images, 1200×630px is optimal for blog featured images and social sharing, 800×600px suits general content images, and thumbnails work best at 300×200px. Keep file sizes under 200KB for fast loading—use JPEG quality 80-85% or WebP format for best results.
Can I check multiple images at once?
Yes! Our calculator supports batch processing. Upload multiple images simultaneously by selecting several files or dragging and dropping multiple images. Each image displays its own information card showing dimensions, size, ratio, and megapixels. Perfect for checking entire folders of images quickly.
Are my images uploaded to your servers?
No. All image processing happens entirely in your browser using JavaScript. Images never leave your device—no uploads, no server processing, no data collection. This ensures complete privacy and security while providing instant results. Your images remain 100% private.
What image formats are supported?
Our calculator supports all common image formats including JPEG/JPG, PNG, WebP, GIF, BMP, TIFF, and more. It works with photos from cameras, screenshots, downloaded images, and graphics from design software. Both RGB and CMYK color spaces are recognized.
How do I calculate print size from pixels?
Divide pixel dimensions by DPI to get inches. For example, 3000×2000px at 300 DPI = 10×6.67 inches. Our calculator automatically shows recommended print sizes at 72 DPI (web), 150 DPI (draft), and 300 DPI (professional) for each uploaded image. Use 300 DPI for high-quality prints, 150 DPI for posters viewed from distance.
How do I convert pixels to inches or centimeters?
Use our built-in Unit Converter tab in the manual calculator. Enter pixel dimensions and DPI, then select your preferred unit (inches, cm, or mm). Formula: Inches = Pixels ÷ DPI, then Centimeters = Inches × 2.54, Millimeters = Inches × 25.4. For example, 1920 pixels at 96 DPI = 20 inches = 50.8 cm.
What DPI should I use for printing?
Use 300 DPI for professional-quality prints (photos, brochures, magazines), 150-200 DPI for large posters or banners viewed from distance, 72-96 DPI for web/screen display only. Higher DPI means better print quality but requires more pixels. A 4×6" photo at 300 DPI needs 1200×1800 pixels minimum.
Can I use the manual calculator without uploading?
Absolutely! Click "Use Manual Calculator" to input width and height manually. Choose between "Image Info Calculator" to see megapixels and ratios, or "Unit Converter" to convert pixels to physical dimensions. Perfect when planning dimensions or checking specifications before creating images.
Understanding Image Dimensions & Unit Conversion
Digital vs Physical Dimensions
Image dimensions exist in two worlds: digital (pixels) and physical (inches, centimeters, millimeters). A 1920×1080 pixel image has no inherent physical size—its print or display size depends entirely on DPI (dots per inch) or PPI (pixels per inch). The same image appears as 20 inches wide at 96 DPI (screen) or only 6.4 inches at 300 DPI (print).
Understanding this distinction is crucial for designers, photographers, and content creators. Digital dimensions determine file characteristics (resolution, detail, storage), while physical dimensions control real-world appearance. Our calculator shows both perspectives, helping you optimize images for any medium.
How to Convert Pixels to Inches
Formula: Physical Size (inches) = Pixels ÷ DPI
Example Calculations:
- • 1920 pixels ÷ 72 DPI = 26.67 inches (screen display)
- • 1920 pixels ÷ 96 DPI = 20 inches (Windows default)
- • 1920 pixels ÷ 150 DPI = 12.8 inches (draft print)
- • 1920 pixels ÷ 300 DPI = 6.4 inches (high-quality print)
Notice how the same 1920 pixels produce dramatically different physical sizes. Screen viewing typically uses 72-96 DPI, while professional printing demands 300 DPI. Our unit converter handles these calculations instantly—just enter your pixel dimensions and desired DPI.
Converting Between Measurement Units
Once you have inches, converting to metric units is straightforward using fixed conversion factors:
Conversion Formulas:
- • Inches to Centimeters: multiply by 2.54
- • Inches to Millimeters: multiply by 25.4
- • Centimeters to Inches: divide by 2.54
- • Millimeters to Inches: divide by 25.4
Complete Example: 3000×2000 pixels at 300 DPI
Our calculator displays all three units simultaneously, eliminating manual conversions and reducing errors. Perfect for international projects where clients specify dimensions in different measurement systems.
DPI and Image Quality
DPI (dots per inch) determines print quality by controlling how many pixels appear in each physical inch. Higher DPI concentrates more pixels into less space, producing sharper, more detailed prints. Lower DPI spreads pixels further apart, causing visible pixelation.
DPI Quality Guidelines:
- 72-96 DPI: Screen display only. Looks great on monitors but appears blocky when printed. Use for websites, presentations, digital art.
- 150-200 DPI: Acceptable for large-format prints viewed from distance (posters, banners, trade show graphics). Saves file size while maintaining readability.
- 300 DPI: Professional standard for high-quality prints. Required for photos, magazines, brochures, business cards—anything viewed close-up.
- 600+ DPI: Premium quality for art reproductions, fine art printing, or when extreme detail matters. Creates very large files.
Our calculator lets you preview physical dimensions at multiple DPI settings, helping you determine if your image has sufficient resolution for intended use. An image perfect for web (72 DPI) may be too small for professional printing (300 DPI) without pixelation.
Practical Applications
For Photographers: Planning print sales? Check if your camera's megapixels support desired print sizes. A 24MP camera (6000×4000px) produces excellent 20×13" prints at 300 DPI, but only 8×5" at maximum quality from a 12MP camera (4000×3000px).
For Designers: Converting client specifications? If a client requests a 10×15cm poster and you have a 2000×3000px image, calculate required DPI: 10cm = 3.94", so 2000÷3.94 = 508 DPI—more than sufficient! The image will print beautifully at 300 DPI (7.87×11.81").
For Web Developers: Optimizing images? Most screens use 72-96 DPI. A 1920px wide image displays at 20-26 inches physically on typical monitors—perfect for hero images. No need for 300 DPI on websites, saving 75% file size.
For Print Services: Checking customer uploads? Quickly verify if submitted images have sufficient resolution for requested print sizes. A customer wanting an 8×10" print needs minimum 2400×3000px at 300 DPI—anything less risks quality issues.
Common Unit Conversion Scenarios
Scenario 1: Web Image to Print
You have a 1200×800px website image. Can you print it as a 4×6" photo?
Scenario 2: Meeting Print Requirements
Magazine requires 210×297mm (A4) at 300 DPI. What pixel dimensions needed?
Scenario 3: Screen to Print Conversion
Screenshot is 2560×1440px (72 DPI). Maximum print size at 300 DPI?
Using Our Unit Converter Tool
Our integrated unit converter eliminates manual calculations. In the manual calculator section, switch to the "Unit Converter" tab to:
- Enter pixel dimensions (width and height)
- Select DPI from presets (72, 96, 150, 300, 600) or enter custom value
- Choose display unit (inches, centimeters, or millimeters)
- View instant conversion showing all units simultaneously
The tool displays a comprehensive breakdown: your selected unit prominently, plus reference conversions in all other units. This helps verify dimensions meet requirements across different measurement systems without juggling calculators or conversion charts.
Frequently Asked Questions
How do I check the size of an image?
Simply drag and drop your image into our calculator or click to browse and select files. The tool instantly displays dimensions (width × height in pixels), file size in MB/KB, aspect ratio, megapixels, format, and DPI. No installation or registration required—everything works directly in your browser.
What's the difference between image size and file size?
Image size refers to dimensions (width × height in pixels), while file size refers to storage space (MB/KB). A 1920×1080 image can have different file sizes depending on format and compression—JPEG might be 200KB, PNG 3MB, WebP 150KB. Our calculator shows both metrics clearly.
How many megapixels do I need?
It depends on usage: Web display needs 0.5-2MP (1920×1080 = 2.07MP), 4×6" prints require 2MP minimum (3MP recommended), 8×10" prints need 6-8MP, and professional large prints benefit from 12-24MP. More megapixels allow larger prints and more cropping flexibility but create bigger files.
What is a good image size for websites?
For web use, 1920×1080px (Full HD) works well for hero images, 1200×630px is optimal for blog featured images and social sharing, 800×600px suits general content images, and thumbnails work best at 300×200px. Keep file sizes under 200KB for fast loading—use JPEG quality 80-85% or WebP format for best results.
Can I check multiple images at once?
Yes! Our calculator supports batch processing. Upload multiple images simultaneously by selecting several files or dragging and dropping multiple images. Each image displays its own information card showing dimensions, size, ratio, and megapixels. Perfect for checking entire folders of images quickly.
Are my images uploaded to your servers?
No. All image processing happens entirely in your browser using JavaScript. Images never leave your device—no uploads, no server processing, no data collection. This ensures complete privacy and security while providing instant results. Your images remain 100% private.
What image formats are supported?
Our calculator supports all common image formats including JPEG/JPG, PNG, WebP, GIF, BMP, TIFF, and more. It works with photos from cameras, screenshots, downloaded images, and graphics from design software. Both RGB and CMYK color spaces are recognized.
How do I calculate print size from pixels?
Divide pixel dimensions by DPI to get inches. For example, 3000×2000px at 300 DPI = 10×6.67 inches. Our calculator automatically shows recommended print sizes at multiple DPI levels for each uploaded image. Use our DPI selector to see dimensions at 72 DPI (web), 150 DPI (draft), 300 DPI (professional), and more.
How do I convert pixels to inches or centimeters?
Use our built-in Unit Converter tab in the manual calculator. Enter pixel dimensions and DPI, then select your preferred unit (inches, cm, or mm). The tool instantly shows conversions in all units. Formula: Inches = Pixels ÷ DPI, Centimeters = Inches × 2.54, Millimeters = Inches × 25.4.
What DPI should I use for printing?
Use 300 DPI for professional-quality prints (photos, brochures, magazines), 150-200 DPI for large posters or banners viewed from distance, 72-96 DPI for web/screen display only. Higher DPI means better print quality but requires more pixels. A 4×6" photo at 300 DPI needs 1200×1800 pixels minimum.
Can I use the manual calculator without uploading?
Absolutely! The manual calculator has two tabs: "Image Info Calculator" shows megapixels, aspect ratio, and memory usage from pixel dimensions. "Unit Converter" converts pixels to physical dimensions (inches, cm, mm) based on DPI. Perfect for planning dimensions before creating images.
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