20 MB CSV sample file
A CSV file of exactly 20,971,520 bytes. It is a valid Comma-separated values file, generated for this site and checked with an independent parser. Use it wherever you need a 20 MB sample, test or dummy CSV file.
Download
sample-csv-20mb.csv
20 MB20,971,520 bytes
Download 20 MB CSVCreated in your browser in a few seconds, then checked against the SHA-256 checksum. No sign-up.
- Type
- text/csv
- SHA-256
5c916179c1ffe8dce1fd65c52c32625c3a9165650b8096c5b93bdb951579879c- Delivery
- Created in your browser. Files of 2 MB and more have no direct URL (why).
What is in this file
A header row and 154,478 rows of fictional customer records in 12 columns. The notes field of the last row is lengthened so the file lands on the exact byte count.
| Data rows | 154,478 |
|---|---|
| Columns | 12 |
| Delimiter | Comma |
| Header row | Yes |
| Line endings | CRLF (RFC 4180) |
| Encoding | UTF-8 (ASCII characters only) |
How the file begins
The opening lines of sample-csv-20mb.csv, exactly as they appear in the file.
id,first_name,last_name,email,phone,city,country,signup_date,plan,balance,active,notes
1,Mia,Brennan,mia.brennan1@example.org,+1-202-555-0102,Osaka,JP,2023-09-27,team,1070.40,true,Upgraded after a support call
2,Freya,Okafor,freya.okafor2@example.com,+1-202-555-0152,Da Nang,VN,2023-08-15,free,4871.96,true,Upgraded after a support call
3,Sofia,Tanaka,sofia.tanaka3@example.com,+1-202-555-0154,Cork,IE,2022-03-02,business,1958.37,true,Interested in bulk pricing
4,Tomas,Weller,tomas.weller4@example.com,+1-202-555-0156,Utrecht,NL,2023-07-12,starter,865.51,true,Trial extended by two weeks
5,Kenji,Quimby,kenji.quimby5@example.org,+1-202-555-0187,Osaka,JP,2021-03-13,team,3237.65,false,Reported a login issue in March
6,Priya,Varga,priya.varga6@example.org,+1-202-555-0191,Porto Alegre,BR,2023-05-24,starter,2197.88,true,Requested data exportPreview
Creates the file in your browser and shows its first 64 KB.
Where 20 MB matters
A 20,971,520-byte file: right at the default attachment limit of Outlook, and just under the 25 MB ceilings of Gmail and GitHub web uploads. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Microsoft Outlook | 20 MB of attachments by default for internet mail accounts | This file is right at the limit; add a second attachment and it is exceeded. |
| Gmail | 25 MB per message | Under the limit, although email encoding adds about a third in transit. |
| GitHub web uploads | 25 MiB per file added through the browser | Accepted. Pushing with Git allows larger files. |
| Cloudflare Pages assets | 25 MiB per file | The largest round size that can be served as a static asset. |
| Amazon API Gateway | 10 MB payload | Rejected; the upload has to go directly to object storage. |
| ASP.NET Core (Kestrel) | About 28.6 MB request body by default | Accepted with room for the multipart overhead. |
Use this file for
- Testing email attachment limits
- Testing data import features
- Checking delimiter and encoding detection
Testing notes for CSV
- Splitting each line on commas breaks on quoted fields. Test with the quoted-fields sample before trusting an importer.
- Excel opens CSV files using the system locale, so a file that works in one country shows everything in one column in another.
Technical details
| File name | sample-csv-20mb.csv |
|---|---|
| Format | CSV (Comma-separated values) |
| Extension | .csv |
| MIME type | text/csv |
| Size | 20,971,520 bytes (20 MB) |
| Kind | Text |
| SHA-256 | 5c916179c1ffe8dce1fd65c52c32625c3a9165650b8096c5b93bdb951579879c |
| Created | 2026-10-14 |
| Validation | Exact size, signature bytes and structure checked when the generator was built; your copy is checked against the SHA-256 after it is created |
| Preview | Available on this page |
| Source | Generated in your browser by this site's generator; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Spreadsheets |
Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Verify your copy
This file is created in your browser, so it has no direct URL for curl or wget. The bytes are the same every time and in every browser, so after saving it you can compare its checksum with the SHA-256 value above.
sha256sum sample-csv-20mb.csv # Linux
shasum -a 256 sample-csv-20mb.csv # macOSOn Windows, run Get-FileHash sample-csv-20mb.csv -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy, or use a 1 MB file, which has a direct URL.
Related files
Questions about this file
- Is this file exactly 20 MB?
- Yes. It is 20,971,520 bytes, which is 20 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 20 MB CSV file?
- A header row and 154,320 rows of fictional customer records in 12 columns. The notes field of the last row is lengthened so the file lands on the exact byte count.
- Do the CSV samples have a header row?
- Yes. The first line names the columns, and the sized samples use CRLF line endings as RFC 4180 describes.