Free Online Tool
File Size Converter
Convert between bytes, KB, MB, GB, and TB using a simple free calculator.
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Large images can slow down your website.
If your website feels slow or outdated, dean-da-dev can help you build a faster, more professional website — optimised images, clean code, and performance best practices included as standard.
Improve My WebsiteFAQ
Questions about the file size converter.
Is this File Size Converter free?
Yes. Completely free, no sign-up needed.
What units does it support?
Bytes, Kilobytes (KB), Megabytes (MB), Gigabytes (GB), and Terabytes (TB). Calculations use 1 KB = 1,024 bytes (binary standard).
What is the difference between KB and KiB?
KB (Kilobyte) technically means 1,000 bytes in the decimal (SI) system. KiB (Kibibyte) means 1,024 bytes in the binary system. Most storage and web tools use binary, which is what this tool uses.
Can dean-da-dev help with my website?
Yes. dean-da-dev builds fast, mobile-friendly websites for UK businesses. Book a free call to discuss your project.
Need this built professionally?
Hire Dean Da Dev to turn the idea into a real product.
Book a short discovery call, request a quote, or review live work before deciding.