What this tool does
File Size Converter converts bytes, KB, MB, GB, TB, and binary units such as KiB and MiB.
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📦 File Size Converter
Convert file sizes with explicit decimal and binary unit handling, copyable reports, and JSON summaries.
File size checks
Validates units and non-negative numeric input. Results distinguish decimal units like MB/GB from binary units like MiB/GiB.
Why it is useful
It helps compare storage, upload limits, memory budgets, logs, media files, and bandwidth calculations.
How it works
The browser converts values through bytes using decimal or binary unit factors.
Best input
Choose whether your source uses decimal units or binary units.
Planning tip
Cloud providers, operating systems, and hardware vendors may display size units differently.
Privacy note
Unit conversion runs locally in your browser.
Important limitation
Decimal and binary units differ, so GB and GiB are not interchangeable.
Quick answers
What is the difference between MB and MiB?
MB is decimal; MiB is binary.
Why does my drive look smaller?
Operating systems and vendors often report capacity using different unit systems.
Common Use Cases
Compare upload and storage limits
Convert between MB, GB, MiB, and GiB without mixing bases.
Prepare agent-safe size summaries
Copy exact byte counts and JSON summaries for scripts, tickets, or API calls.