What's the difference between KB and kB?

KB (uppercase) uses the binary system (1,024 bytes), while kB (lowercase) uses the decimal system (1,000 bytes). Most computers use the binary system.

Why do file sizes appear different on different devices?

Different operating systems and applications may use either binary (1024-based) or decimal (1000-based) calculations, leading to slight variations in displayed file sizes.

How accurate are the conversions?

Our converter uses precise mathematical calculations and displays results with appropriate decimal precision for maximum accuracy.

Can I convert any file type?

Yes! The converter works with any file type since it only reads the file size metadata, not the file content itself.

File Size Converter — Bytes, KB, MB, GB, TB

Free online file size converter for translating between bytes, kilobytes (KB), megabytes (MB), gigabytes (GB) and terabytes (TB). Get instant results with conversion tables, formulas and real-world examples. The interactive converter loads once JavaScript is enabled.

Whether you are planning storage, optimising uploads, working with markdown documents or estimating download times, our converter helps you switch between binary (1024-based) and decimal (1000-based) units accurately. Available in English and German.

Popular conversions

Convert MB to GB — Megabytes to gigabytes.
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Convert TB to GB — Terabytes to gigabytes.
Convert Bytes to KB — Bytes to kilobytes.
Convert KB to Bytes — Kilobytes to bytes.
Convert Bytes to MB — Bytes to megabytes.
Convert MB to Bytes — Megabytes to bytes.
Convert Bytes to GB — Bytes to gigabytes.
Convert GB to Bytes — Gigabytes to bytes.
Convert KB to GB — Kilobytes to gigabytes.
Convert MB to TB — Megabytes to terabytes.
Convert TB to MB — Terabytes to megabytes.

About this tool

Drag and drop a file to detect its exact size, or type a value and choose source and target units. The converter supports both the binary system (1 KB = 1024 bytes) used by most operating systems and the decimal system (1 KB = 1000 bytes) used by manufacturers. Results include precise conversion tables and quick copy-to-clipboard.