File Size Formatter
DATAConvert and format file sizes between KB, MB, GB, TB.
ℹ️ About File Size Formatter
File Size Formatter is a free online data tool from Tools Coaster. Convert and format file sizes between KB, MB, GB, TB. It is handy for file, size, format tasks. It runs entirely in your browser — no sign-up, no installs, and nothing you enter ever leaves your device.
📖 How to Use File Size Formatter
1
Paste your data
Enter your JSON, CSV, XML, or other structured data.
2
Run File Size Formatter
The tool parses and transforms your data instantly.
3
Check the output
Review the converted or validated result.
4
Copy or export
Copy the output for your spreadsheet, database, or app.
💡 Examples
Data conversion
INPUT
name,age
Ada,36→
OUTPUT
[{ "name": "Ada", "age": "36" }]🚀 Pro Tips
✓Round-trip between formats (CSV ↔ JSON) to spot malformed rows quickly.
✓Everything runs locally in your browser — your input is never uploaded to a server, so it is safe for private or sensitive data.
✓Keep headers consistent — the first row usually defines your field names.
✓Use it to prototype data shapes before writing an import script.
✓Handles nested JSON and arrays, not just flat tables.