File Size Converter
Convert between B, KB, MB, GB, TB (and their binary KiB/MiB cousins).
How to Use
- Type a number in any row.
- All others update live.
- Decimal (KB=1000) and binary (KiB=1024) shown separately.
Show Work
Reference
About the File Size Converter
Working on everyday maths and number work? The File Size Converter is a free browser tool that gives you the answer in seconds. Convert between B, KB, MB, GB, TB (and their binary KiB/MiB cousins).
How it works
Type a value, then pick what you want to change it into. The answer appears straight away. It all happens on your own device, so it is fast and nothing you type is sent away. Just check that you picked the right “from” and “to” so you get the answer you wanted.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
KB or KiB?
Drives/manufacturers use KB=1000. Operating systems typically use KiB=1024 but mislabel it "KB".
How do I use the File Size Converter?
Just type or paste your value. The answer shows up right away — there is no button to press. Change anything and it updates by itself.
Do I need to install or sign up for anything?
Not at all — it runs in the browser with nothing to install and no account. After it loads once, it even works without an internet connection.
Is my information private?
Yes. Everything happens in your browser. Nothing you type is sent to a server or saved anywhere.
Common Use Cases
Bandwidth
Plan transfer sizes.
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