File Size Converter

Convert between bytes, KB, MB, GB, TB, and PB

Value

Unit

Common File Sizes

Email (text)0.00 GB

Photo (3MB)0.00 GB

MP3 Song (5MB)0.01 GB

1080p Movie (1.5GB)1.50 GB

OS Installer (4GB)4.00 GB

Game (50GB)50.00 GB

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What is this tool?

File size unit converter quickly transforms between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Supports both SI (decimal, 1000-based) and IEC (binary, 1024-based) units (KB/MB/GB vs KiB/MiB/GiB). Essential for developers, IT professionals, and anyone working with digital storage who needs accurate unit conversions.

How to use

1
Enter value
Type the number you want to convert.
2
Select units
Choose source and target units (B/KB/MB/GB/TB/PB).
3
Get result
See the converted value in all common units simultaneously.

Frequently Asked Questions

What is the difference between KB and KiB?

KB (kilobyte) = 1000 bytes (SI decimal), while KiB (kibibyte) = 1024 bytes (IEC binary). Storage manufacturers use KB/MB/GB (1000-based) making drives seem larger, while operating systems use KiB/MiB/GiB (1024-based). A "500 GB" drive is actually about 465 GiB.

MB vs MiB?

MB is 1 million bytes. MiB is 1.05 million. Difference is 4.86 percent.

Can I use this in production?

This tool is designed for development and testing. For production use established libraries with security audits.

How do I convert a file size to MB or GB?

Divide by 1,024 per step (binary): bytes → KB → MB → GB → TB. For decimal (SI) values as shown on most drives, divide by 1,000 instead. 1 MiB = 1,048,576 bytes; 1 MB = 1,000,000 bytes.