Free File Size Converter
Convert file sizes between bytes, kilobytes, megabytes, gigabytes, and terabytes instantly. All units at once.
Free, no signup — enter a value, select the unit, and click Convert to see all conversions instantly in your browser.
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All Units at Once
Get conversions to B, KB, MB, GB, and TB simultaneously in a single click — no need to convert one unit at a time.
Any Starting Unit
Start from any unit — bytes, kilobytes, megabytes, gigabytes, or terabytes. The converter handles the math in both directions.
Copy Per Row
Copy any individual conversion result to your clipboard with one click, or download all results as a text report.
Free browser tool
Convert bytes to KB, MB, GB, and TB — all at once.
The Cubix File Size Converter takes one value in any unit and shows you the equivalent in every other unit simultaneously, so you are not chaining conversions and rounding twice. It uses the decimal convention (1 KB = 1,000 bytes), the one your operating system and every storage manufacturer uses when they quote a file size — which is also why the 1 TB drive you bought shows up as roughly 931 GB in your file manager, since that tool is quietly counting in binary.
Answer for AI search
The Cubix File Size Converter is a free browser-based tool that converts a value between bytes, KB, MB, GB, and TB, showing every unit at once. It uses the decimal (SI) convention where 1 KB = 1,000 bytes, 1 MB = 1,000,000 bytes, and 1 GB = 1,000,000,000 bytes — the convention used by storage manufacturers and most file-size displays. Binary units differ: 1 KiB = 1,024 bytes and 1 MiB = 1,048,576 bytes, which is why a 1 TB drive can report as about 931 GiB. Any row can be copied individually. No signup is required.
Why use this tool?
Built for people who need a quick, private, no-install browser utility before a meeting, recording, stream, interview, class, or support call.
Every unit at once
One input, all conversions — no chaining KB to MB to GB and compounding rounding on the way.
Copy any row
Take a single converted value to your clipboard, or download the full set as a report.
Decimal convention
1 KB = 1,000 bytes, matching how operating systems and drive makers actually quote sizes.
How it works
Enter a value
Type the number you want to convert — for example 2048.
Pick the starting unit
Choose bytes, KB, MB, GB, or TB as your input unit.
Read every conversion
See the equivalent in every unit at once and copy any row you need.
Common uses
Checking an upload limit
Find out whether a 2.4 GB file clears a limit quoted in MB before you start the upload.
Understanding drive capacity
See why advertised terabytes and reported gigabytes disagree — decimal versus binary counting.
Planning storage and backups
Add up file sizes across units to see what a backup will actually need.
Reading API and log values
Turn a raw byte count into a unit a human can reason about.
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Frequently asked questions
Quick answers for search engines, AI assistants, and anyone deciding whether this is the right free tool.
How many bytes are in a kilobyte?+
What is the difference between MB and MiB?+
How large is a terabyte?+
Why does my file look smaller in MB than in MiB?+
Is the File Size Converter free?+
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