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File Size Unit Converter
Convert file sizes between KB, MB, GB, and more instantly.
Binary units
1 KB = 1024 bytes
Result
1,024 KB
Exact value: 1024 KB
About file size units
File sizes are measured in bytes. To make numbers readable, we use prefixes like kilo-, mega-, and giga-.
This tool uses the binary standard (IEC), where:
- 1 KB = 1,024 Bytes
- 1 MB = 1,024 KB (1,048,576 Bytes)
- 1 GB = 1,024 MB (1,073,741,824 Bytes)
This calculator runs entirely in your browser. No data is sent to any server.
File Size Unit Converter: Guide
- Intent
- Free file size converter online: convert bytes, KB, MB, GB, and TB to sanity-check upload limits, storage numbers, or byte counts from logs.
- What it does
- Converts between B/KB/MB/GB/TB (binary units) and shows both a formatted result and an exact value.
- Key features
- Binary (1024) units, Swap units, Formatted + exact output
- Privacy
- Runs locally in your browser. No data is uploaded.
- Best for
- Checking upload limits (e.g., "25 MB limit") and converting to other units
- Developers converting byte counts to MB/GB for logs and metrics
- Content teams estimating file sizes from bitrate and duration
- Why this tool
- Uses the common 1024-based (binary) conversions used by many OS displays
- Swap units instantly without retyping values
- Shows both a friendly formatted value and an exact number
How to use
- 1Enter a number (e.g., 1, 500, 2.75).
- 2Choose the From unit and the To unit.
- 3Use the swap button to reverse the conversion quickly.
- 4Read the formatted result and the exact value below it.
Common mistakes
- Confusing decimal vs binary units (some storage labels use 1000-based units; this tool uses 1024).
- Confusing bits vs bytes (this tool is for bytes: KB/MB/GB, not Kb/Mb/Gb).
- Relying on rounded display when you need an exact value (use the exact line).
Examples
Binary conversion (most OS displays)
1 MB -> 1024 KB
1 GB -> 1024 MB
Upload limit sanity check
Upload limit: 25 MB
Convert: 25 MB -> 0.0244141 GB (binary)