File Size Calculator
Calculate file sizes and convert between bytes, KB, MB, GB, and TB.
About File Size Calculator
Calculate file sizes and convert between bytes, KB, MB, GB, and TB.
File Size Calculator is designed to be open-and-go: everything runs in the page with clear on-screen controls, and results appear immediately without any setup.
How to Use File Size Calculator
- Open the tool and allow any permission it asks for (only if needed).
- Follow the on-screen controls to run the task.
- Review the result shown live on the page.
- Copy, save or share the output as required.
Key Features
- No installation or account — just open the page and use it.
- Clear, guided interface that works on desktop and mobile.
- Everything runs locally in your browser for privacy and speed.
Frequently Asked Questions
Do I need to install anything for File Size Calculator?
No. File Size Calculator runs entirely in your web browser — there is nothing to download, install or configure.
Is File Size Calculator free to use?
Yes. File Size Calculator is completely free with unlimited use — no account, download or payment required.
Is my data uploaded to a server?
No. File Size Calculator runs entirely in your browser. Your inputs are never sent to our servers or stored anywhere.
Does File Size Calculator work on mobile?
Yes. The interface is fully responsive and works in any modern browser on Android, iPhone, tablets and desktops.
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