File Size Calculator
Calculate the size of your files in KB, MB, or GB with our free online tool. Upload multiple files or drag and drop for quick results! Compress large images to reduce their size.
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What is a File Size Calculator?
A File Size Calculator helps you determine the size of any file in KB, MB, or GB. This is useful for checking file sizes before uploading to websites with size limits, such as email attachments (typically 25 MB) or cloud storage platforms like Google Drive. Our tool supports multiple file uploads, drag-and-drop, and image compression for large files.
How to Use
Step 1: Upload Files - Drag and drop your files into the designated area or click "Choose Files" to upload them manually.
Step 2: Select Compression Level - Choose the desired compression percentage (10% to 90%) from the dropdown. This determines how much the file size will be reduced. For example, selecting 50% aims to reduce the file size by approximately 50%.
Step 3: Calculate Size - Click the "Calculate Size" button to see the size of your files in KB, MB, or GB.
Step 4: Compress Images (if applicable) - Images larger than 10 KB (in JPEG, PNG, or WebP format) will show a "Compress" button in the results table. Clicking this will compress the image by the selected percentage (e.g., 50%) and convert it to JPEG format for better compression.
Step 5: Download Compressed Files - After compression, a "Download" button will appear. Click it to download the compressed image in JPEG format.
Frequently Asked Questions
How do I calculate file size online? Upload your file(s) using our File Size Calculator or drag and drop them into the designated area, then click "Calculate Size" to see the size in KB, MB, or GB.
What is the difference between KB, MB, and GB? 1 MB equals 1024 KB, and 1 GB equals 1024 MB. Our tool automatically converts file sizes to the most appropriate unit for easy comparison.
Can I check multiple files at once? Yes! Select multiple files by holding Ctrl (Windows) or Command (Mac) while clicking, or drag and drop multiple files into the drop area.
Can I compress images with this tool? Yes! If an image file is larger than 10 KB, you’ll see a "Compress" button in the results table. You can choose the compression percentage (10% to 90%), and the image will be compressed accordingly and converted to JPEG format.
Does this tool work with all file types? The calculator works with all file types for size checking. Compression is currently supported for images (e.g., JPG, PNG, WebP).