File Size Calculator
Convert between bytes, KB, MB, GB and TB, or check a file\u2019s size.
About the File Size Calculator
This is a free, browser-based file tool on ToolsFlow. Convert between bytes, KB, MB, GB and TB, or check a file\u2019s size. There's nothing to install and nothing to sign up for — open the page, do the task, and you're done.
Frequently Asked Questions
Is the File Size Calculator free to use?
Yes. It’s completely free, with no signup, subscription, or usage limits.
Do I need to install anything or create an account?
No. It runs entirely in your web browser — there's no software to install and no account required.
Is my data safe when I use this tool?
Yes. It runs client-side in your browser, so your files and text are processed on your own device and are never uploaded to a server.
Does it work on mobile devices?
Yes. It works on any modern browser, on phone, tablet, or desktop.
What does this tool actually do?
Convert between bytes, KB, MB, GB and TB, or check a file\u2019s size.
Is this the same as a convert file bytes kb mb gb tb?
Yes — different people search for this task under different names. This tool covers it either way, for free.