File Size Converter: Convert KB, MB, GB, TB Online | Free
2 usesFile Size Tips
SI & Binary Units
Convert between decimal (KB=1000B) and binary (KiB=1024B) file size standards.
All Units at Once
Enter a value and see the conversion in all units simultaneously.
Bits Included
Also shows the value in bits for network bandwidth calculations.
Instant Conversion
Results update in real-time as you type.
Frequently Asked Questions
What is the difference between KB and KiB?
KB (kilobyte) = 1000 bytes (SI decimal). KiB (kibibyte) = 1024 bytes (IEC binary). Operating systems often mix these, causing confusion.
Why does my 1TB drive show less space?
Drive manufacturers use SI (1TB = 1,000,000,000,000 bytes), but OS uses binary (1TiB = 1,099,511,627,776 bytes), so a 1TB drive shows as ~931 GiB.
Is this free?
Yes.
Why do I need to convert gigabytes to megabytes for online file uploads?
Many online services, like email attachments or website forms, impose specific file size limits, often expressed in megabytes (MB), even if your original file is in gigabytes (GB). Our File Size Converter helps you quickly understand if your large files fit these requirements by showing you the exact MB equivalent, ensuring a smooth upload process without unexpected errors.
When managing server storage or cloud backups, why is it important to accurately convert between SI (GB) and IEC (GiB) units?
Accurate conversion between SI (decimal, e.g., GB) and IEC (binary, e.g., GiB) units is crucial for server and cloud management to avoid capacity miscalculations. Cloud providers often quote in SI units, while operating systems and applications display in IEC. Using a reliable file size converter ensures you provision the correct storage, prevent unexpected "out of space" errors, and optimize costs by understanding exact capacity differences.
How to Convert File Sizes
- Enter a value
- Select the unit
- View all conversions instantly
- Both SI and binary standards shown