File Size Format

Quick answer: Understand file sizes: convert bytes/KB/MB/GB and decode the 1000-vs-1024 confusion. Open 文件大小格式化 — everything runs locally in your browser, and files never leave your device.

Steps

1. Enter a byte count or pick a unit.
2. Read the conversions and the practical analogy.

Important notes

• Drive makers use decimal (1 MB = 1000 KB); operating systems often use binary (1024) — the same file shows different sizes, and an "8 GB" stick showing 7.4 GB is normal.
• Upload limits: a platform's "10 MB" usually means 10×1024×1024 bytes.

Common questions

Convert network speed? 1 Mbps = 0.125 MB/s — divide by 8.

Why do sizes differ between tools? Decimal vs binary units above.

When to use this

When uploads fail, compare the tool's reported size against the platform limit in the same unit — mixed units cause most "mystery" rejections.

Pro tips

The decimal-versus-binary distinction is not pedantry — it changes decisions. When a hosting panel says your disk is 80% full at "80 GB" of a "100 GB" quota, you are seeing both conventions in one screen. The practical habit: when comparing your file size against any published limit, convert both to the same unit system first, and when in doubt, stay 5% under the limit to absorb the discrepancy. For bandwidth planning, remember the 8-bit rule: a "100 Mbps" line moves at most ~12.5 MB/s, and real throughput is 70-90% of that.

Why does my 1 GB file show as 953 MB? Binary (GiB = 1024³) versus decimal (GB = 1000³) — same bytes, different unit conventions.