1 MB CSV test file
A CSV spreadsheet of exactly 1,048,576 bytes, created instantly in your browser. Nothing is uploaded, and there is no sign-up.
Testing a limit? Grab the edge cases too
Need another size or name? Open it in the generator.
What’s inside the file
A small sample table (id, name, active) padded with trailing spaces, so spreadsheet apps and CSV parsers still read it.
- Size: 1,048,576 bytes = 1 MB (binary) ≈ 1.05 MB (decimal)
- MIME type:
text/csv - File name:
dummy-1mb.csv
Will a 1 MB file upload?
How a 1 MB file compares with published limits (verified 2026-09-27):
| Service | Limit | 1 MB file |
|---|---|---|
| Gmail — email attachments (total per message) | 25 MB | Fits |
| Outlook.com — email attachments | 25 MB | Fits |
| Yahoo Mail — email attachments (total per message) | 25 MB | Fits |
| WhatsApp — documents / files | 2 GB | Fits |
| Discord (free) — file attachments | 20 MB | Fits |
| Slack — file upload | 1 GB | Fits |
| Facebook Messenger — files in chats | 100 MB | Fits |
| Notion (Free) — file upload | 5 MB | Fits |
| Trello (Free) — card attachment from computer | 10 MB | Fits |
| X (Twitter) — image | 5 MB | Fits |
| LinkedIn — document post (pdf, docx, pptx) | 100 MB | Fits |
| Shopify — product image | 20 MB | Fits |
| Typeform — file upload question | 10 MB | Fits |
Sources and 40+ more limits (servers, frameworks, cloud storage): file upload limits reference.
Good for testing
- Bulk-import screens
- ETL and data-pipeline size limits
- Spreadsheet upload validation
Questions
Is this 1 MB CSV exactly 1,048,576 bytes?
Yes. The file is exactly 1,048,576 bytes (1 MB with 1 MB = 1,024 × 1,024 bytes). If the system you test counts 1 MB as 1,000,000 bytes, use the 1,000,000-byte button instead.
Will the CSV file open?
A small sample table (id, name, active) padded with trailing spaces, so spreadsheet apps and CSV parsers still read it.
Is it safe? Where does the file come from?
The file is created by JavaScript in your own browser when you click the button. Nothing is uploaded or downloaded from a server, and the file contains no macros, scripts or personal data.
More about the format: CSV format guide.