Free TXT test files and sample generator
Raw unformatted text. The simplest format for logs, notes and line-based test fixtures.
What is a .txt file?
TXT: Plain Text. Plain text is the simplest possible file, which makes it the cleanest way to isolate a size or encoding problem from any format-specific behavior. If something fails with a .txt file, the format is not the cause.
Why generate a test TXT file?
- Establish a baseline for upload, storage and transfer limits before testing complex formats.
- Test character-set handling by filling a file with numbers, symbols or mixed content.
- Generate a precisely sized file to probe an exact byte threshold.
What you can put inside a .txt file
You get 4 content options for TXT, so the file holds something meaningful rather than random padding: Text only, Numbers only, Special characters, Line-delimited data. Pick several and they are merged into one file, with a section, sheet, slide or folder for each.
How a .txt file is identified
A .txt file has no signature at the start. A text format has no identifying leading bytes, so the extension and the reported media type are the only claims about it until a parser actually reads it, which is why validating uploads by extension alone is unsafe.
How the size lands on the exact byte
Rows and lines are generated to fill the target, and the last line is padded to land on the exact byte.
Negative testing with broken TXT files
- Invalid. Identifiable, but wrong inside, so it fails during parsing.
- Corrupted. The leading bytes are destroyed. Same length as the valid file.
- Incomplete. Truncated part-way, so it is genuinely shorter.
- Empty. Chosen under Content rather than File Condition: valid structure, no data.
Which failure to reach for, and what to assert for each, is covered in how to make a corrupted file for testing. For upload limits and type checks see testing file upload validation, and for this format's encodings, UTF-16 and BOM test files.
Sample TXT content
Software Test Data Software Test Data Software Test Data Software Test Data Software Test Data …
This shows the shape of the file. Your download is generated fresh at the size you choose, so the values will differ.
How to open and verify the file
Any text editor, or `wc -c file.txt` to confirm the exact byte count.
Media type text/plain · extension .txt · category Doc & TXT
Generate a .txt file → · questions about sizes, privacy or cost are answered on the site FAQ.
Frequently asked questions about TXT files
What identifies a .txt file?
Nothing at the start of the file does. A text format has no identifying leading bytes, so the extension and the reported media type are the only claims about it until a parser actually reads it, which is why validating uploads by extension alone is unsafe.
How can a .txt file be an exact number of bytes?
Rows and lines are generated to fill the target, and the last line is padded to land on the exact byte.
What can go inside the TXT file?
There are 4 content options for .txt: Text only, Numbers only, Special characters, Line-delimited data. Choose more than one and they are combined into a single file, a section, sheet, slide or folder per option, rather than downloaded separately.
Can I download several broken TXT files at once?
Yes, select more than one File Condition and you get one ZIP containing a .txt per condition, each named after its condition.
Can the TXT file use UTF-16 or a byte-order mark?
Yes. .txt is a text format, so it can be generated as UTF-8, UTF-8 with a byte-order mark, UTF-16 LE or UTF-16 BE. The body is shortened before re-encoding so the finished file still lands on the exact size you asked for. Note that a UTF-16 file always has an even byte count.
How do I open or verify the TXT file?
Any text editor, or wc -c file.txt to confirm the exact byte count.