About This Tool
The image file size checker shows the space used by your original file alongside its dimensions and type. Use it to check attachment limits, upload requirements, or storage needs.
How to Use
- Choose or drop in an image.
- Review the original byte count and its equivalents in KB, MB, KiB, and MiB.
- Check the actual MIME type, filename extension, and image dimensions.
- To reduce the size, use the matching image compressor or file size reducer below.
Supported Formats
- PNG, JPG/JPEG, and static WebP images are supported. Choose or drop in one image at a time.
- Files can be up to 100 MiB, 40 million pixels, and 16384 pixels on either side. Large images need more memory, so choose a size that works well on your device.
Understanding the Results
- Bytes is the original file’s byte count. Decimal units use 1 KB = 1000 bytes and 1 MB = 1,000,000 bytes.
- Binary units use 1 KiB = 1024 bytes and 1 MiB = 1,048,576 bytes. This is why the same file has different values in MB and MiB.
- The actual MIME type is identified from the image contents; the extension comes from the filename. They may differ.
- Bytes per pixel is the file size divided by the total pixel count. It can help compare file sizes relative to dimensions, but it is not a compression ratio.
File Size and Image Dimensions
- Images with the same dimensions can take up different amounts of space because of their contents, format, quality, and embedded information.
- This tool reads the original file without resaving or compressing it. To reduce its size, try adjusting compression quality or using smaller pixel dimensions.
Privacy
Your images are processed only in your browser and are never uploaded to a server.
The tool does not automatically save your input or results. Copy or download anything you need before clearing or leaving the page, and keep the original image.
FAQ
How do KB and MB convert?
In the decimal units used here, 1 MB = 1000 KB. KiB and MiB are binary units, where 1 MiB = 1024 KiB.
Why do images with the same dimensions have different file sizes?
Image contents, format, compression quality, transparency, and metadata all affect file size. Solid-color images are usually easier to compress than detailed photos.
Does an image with more pixels always have a larger file size?
No. More pixels usually require more data, but compression, quality, and image detail also matter. Check the actual byte count to know the file size.
How can I make an image file smaller?
Use an image compressor for the file’s format, or reduce its dimensions to suit your needs. JPG, PNG, WebP, and target file size tools are linked below.