Byte Size is a free data & format tool that runs entirely in your browser — humanize & convert data sizes. No upload, no account, no limits.
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How to use Byte Size
Open the Byte Size tool.
Paste or type your JSON, CSV, XML or YAML into the input field.
The output updates as you type — adjust the options if you need a different format.
Copy the result, or share the URL to hand the exact input to someone else.
About Byte Size
Humanize and convert data sizes. Enter an amount in any unit from bytes to petabytes and see it in bytes, bits, decimal (÷1000, KB/MB/GB) and binary (÷1024, KiB/MiB/GiB) forms side by side.
What people use it for
Convert a byte count into a human-readable KB/MB/GB figure.
Compare decimal (MB) vs binary (MiB) sizes.
Translate a file size between units.
Frequently asked questions
Decimal vs binary?
Both are shown — decimal divides by 1000 (KB, MB), binary divides by 1024 (KiB, MiB).
Is it private?
Every calculation happens on this page, in your own browser. Your input is never sent to a server, never logged and never used for training — which also means the tool keeps working when you are offline.