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Image size finder — check image width, height & file size

Check image dimensions online free. Find width, height, file size, aspect ratio of any image instantly. Upload or drag & drop JPG, PNG, WebP, TIFF, BMP, GIF, SVG. No uploads, private.

What is an Image Size Finder?

An image size finder is a free online tool that instantly displays the dimensions, file size, aspect ratio, and format of any image you upload. Instead of right-clicking a file and digging through properties, you simply drag and drop your image into the browser and all information appears immediately. The tool uses the browser's native image decoder to read pixel dimensions and calculates the file size and aspect ratio locally — no image data is ever uploaded to a server. Whether you're a web developer checking asset dimensions, a designer comparing aspect ratios, or just curious about a photo's resolution, this image size finder gives you accurate information in seconds, completely free and private.

Image Size Finder Features

Everything you need to check image dimensions and file properties.

  1. Pixel Dimensions: See exact width × height in pixels. Get accurate pixel dimensions for any image format your browser supports.
  2. File Size Display: View file size in KB or MB. Understand how much storage or bandwidth each image consumes at a glance.
  3. Aspect Ratio Detection: Automatically calculate and display the aspect ratio. Common ratios like 16:9, 4:3, 1:1 are detected and labeled.
  4. Multi-File Support: Upload multiple images at once. Each image gets its own result card with complete size information.
  5. Clipboard Paste: Paste images directly from your clipboard with Ctrl+V (Cmd+V). No need to save files to disk first.
  6. Format Recognition: Identifies image format (JPEG, PNG, WebP, GIF, SVG, etc.) and displays the MIME type for each file.

How to Check Image Size

Three simple ways to find image dimensions.

  1. 1. Upload Your Image: Drag and drop an image into the tool, click "Choose File" to browse, or paste from clipboard with Ctrl+V.
  2. 2. View Results Instantly: The tool automatically displays all size information: pixel dimensions, file size, aspect ratio, and format.
  3. 3. Analyze More Images: Upload additional images at any time. Each one appears in its own result card for easy comparison.

Tips for Checking Image Sizes

Get the most out of this image dimension checker.

  1. Use Drag & Drop for Speed: For the fastest workflow, drag images directly from Finder/Explorer into the tool area. No clicking through file dialogs.
  2. Paste Screenshots Directly: Take a screenshot and paste it directly with Ctrl+V (Cmd+V). The tool reads dimensions instantly from your clipboard.
  3. Check Multiple Images at Once: Select multiple files when browsing, or drag a selection of images. All are analyzed simultaneously for quick comparison.
  4. Note the Aspect Ratio: Use the aspect ratio column to quickly identify images that match specific social media or display requirements (16:9 for YouTube, 1:1 for Instagram).
  5. Verify Resolution Before Upload: Before uploading images to websites, marketplaces, or social media, check dimensions here. Many platforms reject images below minimum size thresholds.
  6. Use File Size for Optimization: If an image is large in KB/MB but small in pixels, it may need compression. Pixels × file size comparison helps identify optimization opportunities.

Perfect for These Uses

When you need to check image dimensions.

  1. Web Developers: Quickly check image dimensions before adding them to layouts. Verify images meet responsive design requirements.
  2. Graphic Designers: Compare image sizes and aspect ratios across multiple assets. Perfect for maintaining design consistency.
  3. SEO & Performance: Check image file sizes to ensure pages load quickly. Large images can slow down websites and hurt SEO.
  4. Social Media Managers: Verify image dimensions meet platform requirements for posts, stories, banners, and profile pictures.
  5. Print Preparation: Check pixel dimensions before sending images to print. Ensure images have enough resolution for your target print size.
  6. E-commerce Sellers: Verify product images meet marketplace requirements (Amazon, eBay, Shopify) for minimum dimensions and aspect ratios.

Why Use This Image Size Finder

Advantages of checking image dimensions with this tool.

  1. Instant Results: No waiting for uploads. All analysis runs locally in your browser — results appear instantly.
  2. Complete Privacy: Images stay on your device. No server uploads, no storage, no third parties — 100% private.
  3. No Software Required: No Photoshop, no image viewer, no downloads. Check image dimensions directly in your browser.
  4. Batch Processing: Upload and analyze multiple images simultaneously. Compare dimensions across files.
  5. Supports All Formats: JPG, PNG, WebP, TIFF, BMP, GIF, SVG, HEIC, AVIF — any format your browser can open.
  6. Works on All Devices: Desktop, tablet, or mobile — check image sizes from any device with a modern browser.

Technical Details

How the image size finder works under the hood.

  1. Client-Side Processing: All image analysis runs in your browser using JavaScript. Images are decoded by the browser's native image engine; no data is sent over the network.
  2. Natural Dimensions: Pixel dimensions are read from Image.naturalWidth and Image.naturalHeight, ensuring accurate resolution regardless of display scaling.
  3. GCD Ratio Calculation: Aspect ratio uses the Euclidean algorithm (greatest common divisor) to compute the simplest integer ratio. Common ratios are matched with tolerance.
  4. Object URL Previews: Image previews use Object URLs (blob:) created in memory. These are automatically revoked when results are cleared to free memory.
  5. Format Detection: MIME type is read from the File object. For clipboard paste, the type is inferred from the Blob data.
  6. Browser-Based Decoding: Leverages the browser's built-in codecs for all formats (JPEG, PNG, WebP, AVIF, HEIC, etc.), ensuring broad format support without external libraries.

Frequently Asked Questions

Have questions? We have answers.

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