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File Size Checker: Check MB Online
Check file size in KB, MB, or GB before upload, email, forms, or delivery. Files stay in your browser.
How it works
Files are measured locally. Nothing is uploaded.
- Add one or more files
- See each file's size with a visual comparison
- Compare the total and largest file with common or custom limits
Drop files here or click to browse
File sizes
| File | Size | Relative | Actions |
|---|
Enter the maximum accepted by an email, form, or website.
How to check file size in MB
- Click "Add files" or drag files into the drop zone.
- View individual and total sizes with bar chart comparison.
- Compare the total with a custom limit, then check the typical email and per-file FAT32 indicators.
Frequently asked questions
Can I check multiple files at once?
Yes. Add as many files as you like. The tool shows each size and the total.
Are my files uploaded?
No. Only the file size is read from your browser. No data leaves your device.
Why can another app show a slightly different MB value?
Some systems calculate one MB as 1,000,000 bytes and others use 1,048,576 bytes. The exact byte count is shown so you can compare accurately.