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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.

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.

  • Pixel Dimensions

    See exact width × height in pixels. Get accurate pixel dimensions for any image format your browser supports.

  • File Size Display

    View file size in KB or MB. Understand how much storage or bandwidth each image consumes at a glance.

  • Aspect Ratio Detection

    Automatically calculate and display the aspect ratio. Common ratios like 16:9, 4:3, 1:1 are detected and labeled.

  • Multi-File Support

    Upload multiple images at once. Each image gets its own result card with complete size information.

  • Clipboard Paste

    Paste images directly from your clipboard with Ctrl+V (Cmd+V). No need to save files to disk first.

  • 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.
  • 01

    Use Drag & Drop for Speed

    For the fastest workflow, drag images directly from Finder/Explorer into the tool area. No clicking through file dialogs.

  • 02

    Paste Screenshots Directly

    Take a screenshot and paste it directly with Ctrl+V (Cmd+V). The tool reads dimensions instantly from your clipboard.

  • 03

    Check Multiple Images at Once

    Select multiple files when browsing, or drag a selection of images. All are analyzed simultaneously for quick comparison.

  • 04

    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).

  • 05

    Verify Resolution Before Upload

    Before uploading images to websites, marketplaces, or social media, check dimensions here. Many platforms reject images below minimum size thresholds.

  • 06

    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.

Image Size Finder Tools Compared — Which One Fits Your Workflow

How this free image dimension finder stacks up against other popular online tools for checking image size and dimensions.

  1. ImageOnline.co

    Image dimension finder. Shows width and height in pixels. No metadata or DPI info.

  2. PineTools.com

    File size and dimension detection. Basic output with minimal detail.

  3. OnlinePNGTools.com

    PNG size finder. Only PNG input. Shows dimensions, bit depth, color type.

  4. Adobe Express

    Image info via metadata panel in full editor. Requires opening full editor.

  5. Image Size Finder — Check Image Width, Height & File Size Online Free

    Upload any image to instantly read dimensions (width × height) in pixels. Shows physical dimensions at 72/300 DPI. File size info. All in browser.

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.

  • Instant Results

    No waiting for uploads. All analysis runs locally in your browser — results appear instantly.

  • Complete Privacy

    Images stay on your device. No server uploads, no storage, no third parties — 100% private.

  • No Software Required

    No Photoshop, no image viewer, no downloads. Check image dimensions directly in your browser.

  • Batch Processing

    Upload and analyze multiple images simultaneously. Compare dimensions across files.

  • Supports All Formats

    JPG, PNG, WebP, TIFF, BMP, GIF, SVG, HEIC, AVIF — any format your browser can open.

  • 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.
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.
Natural Dimensions
Pixel dimensions are read from Image.naturalWidth and Image.naturalHeight, ensuring accurate resolution regardless of display scaling.
GCD Ratio Calculation
Aspect ratio uses the Euclidean algorithm (greatest common divisor) to compute the simplest integer ratio. Common ratios are matched with tolerance.
Object URL Previews
Image previews use Object URLs (blob:) created in memory. These are automatically revoked when results are cleared to free memory.
Format Detection
MIME type is read from the File object. For clipboard paste, the type is inferred from the Blob data.
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.

Sources & References

Authoritative references on image dimensions, display resolution, and the browser technology this tool uses.
  • “The display resolution or display modes of a digital television, computer monitor, or other display device is the number of distinct pixels in each dimension that can be displayed.”
    — Wikipedia — Display resolution

    Display resolution: This article explains how pixel dimensions define display resolution — the core measurement this tool reads from uploaded images to display width, height, and aspect ratio. en.wikipedia.org/wiki/Display_resolution

  • “The Canvas API provides a means for drawing graphics via JavaScript and the HTML canvas element.”
    — MDN Web Docs — Canvas API

    Canvas API (client-side image rendering): This tool uses browser native image decoding with naturalWidth and naturalHeight to read pixel dimensions. MDN documents how images are loaded and decoded in the browser. developer.mozilla.org/en-US/docs/Web/API/Canvas_API

  • “PNG supports lossless data compression, making it useful for storing graphics that need to be edited repeatedly without losing quality.”
    — W3C — PNG Specification (overview)

    PNG image format: PNG files encode pixel dimensions in their IHDR chunk header, which this tool reads to determine the exact width and height of uploaded PNG images. w3.org/TR/PNG/

  • “Image resolution describes the detail an image holds, commonly measured in pixels per inch (PPI) or the total pixel dimensions.”
    — Wikipedia — Image resolution

    Image resolution and pixel dimensions: This tool reads and displays the exact pixel dimensions (width × height), file size, and aspect ratio of any uploaded image, helping users understand their image resolution. en.wikipedia.org/wiki/Image_resolution

Frequently Asked Questions

Quick answers about this tool—open a question to read more.