File Size Converter
Convert between bytes, KB, MB, GB, TB, PB with quick presets and all-unit table—perfect for storage calculations.
Our File Size Converter provides instant conversions between bytes, KB, MB, GB, TB, and PB using binary (1024-based) calculations. Features 4 quick presets (1024 KB→MB, etc.), real-time all-unit table showing simultaneous conversions, 6-decimal precision, and copy functionality—ideal for developers calculating storage requirements, sysadmins sizing servers, or anyone working with digital file sizes and data transfer rates.
Frequently Asked Questions
How does file size conversion work?
File sizes use binary prefixes (1024-based): 1 KB = 1024 bytes, 1 MB = 1024 KB, 1 GB = 1024 MB, etc. Our converter first converts your input to bytes (base unit), then divides by 1024^n to get the target unit. For example, 2048 KB → 2048 × 1024 = 2,097,152 bytes → 2,097,152 ÷ (1024²) = 2 MB.
What's the difference between KB and KiB?
KB (kilobyte) traditionally means 1024 bytes in computing, but SI standards define it as 1000 bytes. KiB (kibibyte) explicitly means 1024 bytes. Our tool uses the binary standard (1024) common in operating systems, storage, and memory—matching Windows, macOS, and Linux conventions.
Why are there 6 decimal places in results?
High precision (6 decimals) ensures accuracy for small conversions or scientific use. For example, 1 byte to MB = 0.000001 MB. You can round as needed—most file managers show 2 decimals. The precision prevents cumulative errors in calculations or batch conversions.
Can I convert between non-adjacent units?
Yes! Convert directly from bytes to terabytes or any combination. The tool handles all conversions through the byte base, so you don't need intermediate steps. For example, 5 GB → 5,242,880 KB in one operation.
What's the maximum value I can convert?
JavaScript numbers support up to ~9 petabytes (9 × 10^15 bytes) with precision. Beyond that, use scientific notation or specialized libraries. For typical use (files, storage), the tool handles any realistic size including multi-petabyte data centers.
How do I use the all-unit conversions table?
After entering a value, the table shows your input converted to all 6 units simultaneously (B, KB, MB, GB, TB, PB). Useful for comparing scales or finding the most readable unit—e.g., 1,048,576 bytes is clearer as 1 MB.