Generate an exact-size text file
Choose the byte count and download printable ASCII text. Use it for transfer and basic text-reader tests; it does not cover multilingual encoding cases.
1 MB = 1,000,000 B · 1 MiB = 1,048,576 B
Advanced: test an upload limit
Enter the byte limit above, then choose one byte below, the exact limit or one byte above. Each choice uses the same base: 10,485,760 B. Generate and download each file to test your endpoint.
TXT, built to spec.
Each file is a plain UTF-8 text file. The size you ask for is reached with printable ASCII characters, so the result opens in Notepad, TextEdit and VS Code. Most people generate these for the simplest possible upload and transfer test.
Choose a size here
These options set the generator above. Separate size guides explain how to test a particular upload boundary.
Guides for specific upload limits
File structure and testing limits
Printable ASCII filler produces the exact size. ASCII is also valid UTF-8; this does not test multilingual encoding or binary payloads.
Format reference: RFC 3629.
This generator assembles the file in your browser; file content is not sent to a server. Site analytics may make network requests. Office ↔ PDF conversion uses a separate server workflow. Data processing and privacy.
Technical notes for every format · Guide to testing file upload limits
Questions
How small can a TXT file be?
About 1 byte. Below that the format cannot carry its mandatory structure, let alone padding.
Will the file open normally?
Validate the generated fixture in your target application. Parts added for exact size may change or disappear when the file is re-saved; compatibility depends on the reader.
Can I ask for an unusual size?
Any byte count above the minimum works — for example 3,145,728 bytes (exactly 3 MB) or 27.5 MB. Drag the caliper or type the number.
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