# Image Size Checker - Dimensions, Megapixels & File Size Inspect width, height, format, and bytes before you resize or compress. Runs entirely in your browser - no upload, no account, 50.00 MB max per file. ### Upload Click or drag an image Max 50.00 MB Reset ### Results Upload an image to see dimensions and file size ## Check Image Dimensions and File Size Before submitting a photo or publishing an image, it helps to know both how many pixels it contains and how much storage it uses. This checker shows the decoded width and height, megapixels, file size, reported type and extension without changing the selected file. A 1200 × 800 photo has the same dimensions regardless of whether it occupies 200 KB or 2 MB. The actual file size depends on the format, image content and how it was saved. Check both measurements when an upload form lists a pixel requirement and a separate size limit. If the dimensions are too large, try [Resize Image](https://www.toolcomb.com/resize-image). If the framing is wrong, use [Crop Image](https://www.toolcomb.com/crop-image). To reduce file size, try the [Image Compressor](https://www.toolcomb.com/online-image-compressor), then check the new file again. ## How to Check Image Size Online 1. Choose an image - Click the upload area or drop an image up to 50 MiB. 2. Read the results - Review its width, height, megapixels, file size, type and extension. 3. Compare with your requirements - Check both pixel dimensions and file size against the destination's limits. 4. Check another file - Select another image or use Reset. This tool does not modify the original. ## Understanding the Results **Width and height:** These are the displayed image dimensions in pixels. A landscape image is wider than it is tall; a portrait image is taller than it is wide. A square has equal width and height. **Megapixels:** Multiply width by height and divide by one million. A 4000 × 3000 image contains 12,000,000 pixels, or 12 megapixels. This describes pixel count, not whether the photo is sharp or suitable for every print size. **File size:** This is the storage occupied by the selected file. It is separate from pixel dimensions, so reducing dimensions alone does not guarantee a particular file size. The displayed value is rounded; allow a margin when a service enforces a strict limit. **Type and extension:** The report shows the type supplied for the file and its filename extension. These are useful clues, but they are not a forensic verification of the file format. ## Practical Checks Before You Upload **Application photos:** If instructions ask for a 600 × 600 image under a certain file size, confirm the square dimensions and the size separately. The checker cannot assess other rules such as background color, pose or image content. **Website graphics:** Check a banner or product image against the dimensions your site recommends. If an image has the wrong proportions, crop it deliberately before resizing rather than stretching the subject to fit. **Rotated photos:** A phone photo can contain orientation information that different programs interpret differently. If a result is unexpected, open the image and compare its orientation; use [Rotate & Flip Image](https://www.toolcomb.com/rotate-flip-image) when you need to make an upright copy. After any edit, select the newly downloaded file here. The original results do not automatically update when a different copy is resized or compressed. ## What This Checker Does Not Measure This is a read-only check, not an editor or a test of visual quality. It does not report print DPI, inspect an entire animation, or guarantee acceptance by another website. Browser support determines which image formats can be opened. The input limit is 50 MiB, although available device memory can be a practical limit for very large images. Inspection happens in your browser and does not modify the original file. ## Pixels, Aspect Ratio and File Size Explained Pixel dimensions are written as width × height. A 1600 × 1200 photo is landscape and has an aspect ratio of 4:3. A 1200 × 1600 photo has the same number of pixels but is portrait. These measurements describe the image itself, not necessarily the size at which a browser or document will display it. Megapixels summarize the total pixel count: multiply width by height and divide by one million. A 1600 × 1200 image contains 1.92 million pixels, or 1.92 MP. A larger megapixel number does not by itself tell you whether the photo is sharp, correctly exposed or suitable for a specific print. File size describes how much storage the image file occupies. Two images with identical pixel dimensions may have different sizes because their content, format and export settings differ. A flat illustration and a detailed photograph can therefore need different amounts of storage even at the same width and height. Do not confuse pixels with print dimensions. A 3000-pixel-wide image would print at 10 inches wide at 300 pixels per inch, or 20 inches wide at 150 pixels per inch. This checker displays the pixel dimensions; it does not calculate or report a file’s print DPI. ## Example: Preparing an Image for a File-Size Limit Imagine a form requests a square image of 600 × 600 pixels below a stated file-size limit. First select the original in the checker and read both dimensions and file size. If the image is rectangular, use [Crop Image](https://www.toolcomb.com/crop-image) to choose the composition; cropping and resizing are different operations. Next use [Resize Image](https://www.toolcomb.com/resize-image) if the square needs to be 600 × 600. Download the new file and open that file in the checker. If it is still over the limit, use [Image Compressor](https://www.toolcomb.com/online-image-compressor), then inspect the compressed copy again. Allow for rounding when comparing the displayed size with a strict limit. Also read the destination’s other requirements: a correct width, height and size do not guarantee that a photo meets rules about format, content, background or recency. Preserve the source so you can make another version if the requirements change. If a phone photo appears to have its width and height reversed in another program, check the actual orientation in both viewers. Different software may interpret orientation information differently; the checker reports the dimensions provided by the browser’s decoded image. ## Frequently Asked Questions ### What information does the image size checker show? It displays the decoded width and height in pixels, megapixels, file size, file type and extension. ### Is image size the same as file size? Not necessarily. Pixel dimensions describe the image's width and height; file size describes the storage space it uses. Images with the same dimensions can have different file sizes. ### How are megapixels calculated? Multiply width by height and divide by one million. For example, 4000 × 3000 pixels equals 12 megapixels. The displayed value is rounded to two decimal places. ### Can I use this to check an image before an upload? Yes. Compare both dimensions and file size with the destination's published requirements. This checker cannot guarantee that a third-party service will accept the image. ### Does this tool resize or compress my image? No. It reads information about the chosen file without creating a modified image. ### Does it upload my image to a server? The selected image is inspected in your browser, not uploaded for this check. ### Which images can I check? You can check supported image files that your browser can decode. Format support varies by browser and device. ### What is the maximum file size? The input limit is 50 MiB. A large image below that limit can still exceed a device's available memory. ### Why might another program show different dimensions? Programs can interpret image orientation differently. Compare the actual file and its orientation, especially for photos taken on a phone. ### Does it show print size or DPI? The report shows pixel dimensions and file size, not a print-size or DPI reading. Print dimensions also depend on the intended output resolution. ## Related Tools Discover more free tools that might help with your next task. [Geo Tag Image GPS camera with location stamp, EXIF geotag, and NoteCam-style notes Use Tool](https://www.toolcomb.com/geo-tag-image) [Resize Image Resize by pixels or percent with optional aspect lock Use Tool](https://www.toolcomb.com/resize-image) [Crop Image Crop by coordinates or aspect presets Use Tool](https://www.toolcomb.com/crop-image) [Circle Crop Cut a round profile picture with transparent PNG Use Tool](https://www.toolcomb.com/circle-crop) [Rotate & Flip Image Rotate 90° steps or mirror images horizontally/vertically Use Tool](https://www.toolcomb.com/rotate-flip-image) [Watermark Image Stamp text or a logo with opacity and position control Use Tool](https://www.toolcomb.com/watermark-image) [View All Tools](https://www.toolcomb.com/tools)