File without an extension

A plain-text file whose name has no extension, so its type can only be learned from its content.

sample-file-without-extension

61 B61 bytes

Direct download. No sign-up and no waiting.

Type: text/plain
SHA-256: 82e499ff879b2164b85b28a87ac8522b6b089f7ce8ec4b7dd0159c2d9fabaf84
Direct URL: https://sampletestfiles.com/downloads/samples/sample-file-without-extension

Why test with this file

Tests type detection that relies on the file name, and servers that fall back to application/octet-stream.

Extension	None
Content	ASCII text
Likely served as	application/octet-stream

What to check

After your application has processed sample-file-without-extension, confirm that:

Type detection works from content, or the file is refused with an explanation.
The stored file is served with a sensible Content-Type and with nosniff.
The interface shows a usable icon or label for a file of unknown type.

How the file begins

The opening lines of sample-file-without-extension, exactly as they appear in the file.

This file has no extension. Its content is plain ASCII text.

Preview

Shows the file contents.

Technical details

File name	sample-file-without-extension
Format	TXT (Plain text)
Extension	None
MIME type	text/plain
Size	61 bytes (61 B)
Kind	Text
SHA-256	82e499ff879b2164b85b28a87ac8522b6b089f7ce8ec4b7dd0159c2d9fabaf84
Created	2026-10-10
Validation	Exact size, signature bytes and structure checked when the file was generated
Preview	Available on this page
Source	Generated for this site; not copied from elsewhere
Licence	Free to use, modify and redistribute (terms)
Category	Documents

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

Download from the command line and verify

Fetch the file with curl, then compare its checksum with the SHA-256 value above.

curl -o sample-file-without-extension 'https://sampletestfiles.com/downloads/samples/sample-file-without-extension'
sha256sum sample-file-without-extension     # Linux
shasum -a 256 sample-file-without-extension # macOS

On Windows, run Get-FileHash sample-file-without-extension -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.

About TXT

Unformatted text with no structure beyond characters and line breaks. The simplest possible upload.

TXT format reference

Where it fits

MIME type testing
Files with correct, documented signatures for testing type detection and upload allow-lists.
File upload testing
Test an upload form or endpoint with files of every size and type it should accept, and several it should refuse.

Related files

All curated sample files

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