What is the TXT file format?
Files with the .txt extension contain unformatted text. .txt files can be opened and edited using even the simplest text editors, available on most operating systems by default - including Notepad on Windows and TextEdit on macOS.
Unlike document formats used by advanced word processors such as .docx, .txt stores no formatting whatsoever. There are no fonts, colors, or paragraph styles embedded in the file; any visible layout (indentation, line breaks) relies solely on the characters themselves.
Unformatted text files are typically used to save short notes. .txt files are also commonly included with software installers - typically named README.txt - and contain information such as system requirements, main functions, and version numbers.
Because .txt carries no fixed character encoding, the same file may use UTF-8, Windows-1252, or other code pages. Related formats include .log for application output, .md for lightweight markup, and .csv for tabular data.
Security & safety
RISK: LOWA .txt is plain text and cannot execute code, so opening one is safe. The only real cautions: (1) double extensions - malware is sometimes named "invoice.txt.exe"; with file extensions shown, the real type is .exe, not .txt, so check the true extension; (2) opening a huge log (gigabytes) in basic Notepad can hang - use Notepad++/VS Code or a viewer; (3) garbled text is an encoding mismatch, not corruption - reopen as UTF-8.
Format details
in a nutshellFULL NAMEPlain Text File
DEVELOPERN/A - universal format, predates any single vendor (teletype/ASCII era)since Concept predates personal computers; .txt as the standard suffix since early MS-DOS/CP-M (late 1970s-1980s)
CATEGORYText Files
MIME TYPEtext/plain
TYPEplain text (unstructured, human-readable characters)
STANDARDOpen · royalty-free
Programs that open TXT files
Windows3 apps
Windows Notepad
Built-in Double-click the file; it opens in Notepad. Modern Notepad handles Unix line endings and lets you pick the encoding (bottom-right status bar). 
Notepad
Open-source Open large files, logs and code; use Encoding menu to switch/convert UTF-8 ↔ ANSI and fix garbled characters. 
Visual Studio Code
Open-source Open the .txt; click the encoding in the status bar to 'Reopen with Encoding' if text is garbled. 
macOS3 apps
TextEdit
Built-in Double-click to open. Use Format → Make Plain Text to stay in .txt; choose encoding when opening if characters look wrong. 
BBEdit
Freemium Open large or code-like text files; free mode covers viewing/editing and encoding conversion. 
Linux3 apps
gedit / GNOME Text Editor
Open-source Double-click in Files, or 'gnome-text-editor file.txt'. Encoding is auto-detected with manual override.
KWrite / Kate
Open-source Open the .txt in the KDE editor; Tools → Encoding to fix garbled characters.
nano / vim
Open-source Terminal editing: 'nano file.txt' (simple) or 'vim file.txt' (powerful) - pre-installed on most distros. 
Android1 app
Files by Google
Free Tap the .txt to preview the text; for editing install a simple text editor app.
iOS1 app
Technical details
deep spec| MIME type | text/plain |
| Character encoding | No fixed encoding - common choices include UTF-8, UTF-16 LE/BE, Windows-1252, ISO-8859-1, and legacy code pages; encoding is inferred, not declared in the file |
| Byte-order mark (BOM) | Optional leading bytes: UTF-8 BOM = EF BB BF, UTF-16 LE = FF FE, UTF-16 BE = FE FF; most .txt files carry no BOM, requiring heuristic detection |
| Magic bytes / file signature | None - no fixed binary signature; content-type is identified by the .txt extension or heuristic encoding sniffers |
| Line endings | Platform-dependent: CRLF (\r\n) on Windows, LF (\n) on Unix/Linux/macOS; mismatch between systems can cause display issues in some editors |
| Maximum file size | No format-imposed limit; bounded by the host file system (FAT32 caps at 4 GB; NTFS and ext4 support multi-terabyte files) |
| Character set support | Full Unicode (1,114,112 code points) in UTF-8 and UTF-16 variants; restricted to 128 characters in strict ASCII; legacy encodings cover specific regional scripts |
| Structure | Completely unstructured - paragraphs, lists, and sections exist only as blank lines and spaces; no semantic markup or hierarchy |
| Embedded metadata | None - the format stores no author, title, date, or language tag; such information exists only at the OS file-system level |
| Compression | No built-in compression; textual redundancy makes .txt files highly compressible by gzip or DEFLATE (typically 60-80% size reduction) |
| Binary content | Not supported - the file must contain only valid character data; binary bytes cause encoding errors or display as replacement characters (U+FFFD) |
| Common file names | README.txt, LICENSE.txt, CHANGELOG.txt, TODO.txt, notes.txt - conventionally used in software distributions |
| Interoperability | Universally readable on every platform and by every text-capable application; no version lock-in or proprietary dependency |
| Encoding detection risk | The absence of a declared encoding means the same file can render differently in editors assuming UTF-8 vs. Windows-1252, causing garbled non-ASCII characters |
| Programmatic access | Standard I/O in every language: Python open(), Java FileReader, C fopen(), PowerShell Get-Content, shell redirection (> and >>) |
| Released | Concept predates personal computers; .txt as the standard suffix since early MS-DOS/CP-M (late 1970s-1980s) |
| Open standard | Yes · royalty-free |
| Specification | www.unicode.org |
TXT conversions
Possible
.TXT .RTFOnline converter
How to convert
.TXT .ODTOnline converter
How to convert
.TXT .EPUBOnline converter
How to convert
.TXT .FB2Online converter
How to convert
.TXT .ASCOnline converter
How to convert
.TXT .PDFGUIDE
Yes, any plain text file converts to PDF - the fastest way is to open it and use Print > Save as PDF, which…
How to convert
.TXT .DOCXOnline converter
Yes -- open the .txt in Word, Google Docs or LibreOffice Writer and use Save As to get a .docx file.
How to convert
.TXT .SNBOnline converter
How to convert
.TXT .HTMLOnline converter
Yes -- the fastest way is to paste your text into a text editor, add a minimal HTML skeleton, and save the…
How to convert
.TXT .CSVGUIDE
Yes -- if your TXT file contains rows of values separated by a consistent delimiter (comma, tab, semicolon),…
How to convert
Community Q&A
asked by usersNo questions yet - be the first to ask about TXT files.
Frequently asked questions
How do I open a TXT file?
Double-click it. Windows opens it in Notepad, macOS in TextEdit, Linux in gedit/KWrite. Any text editor works - there is nothing to install. For big files or code, use Notepad++ or VS Code.
Why is my TXT file showing weird characters (é, , squares)?
It's an encoding mismatch - the file is in a different encoding than your editor assumed. Reopen it and choose UTF-8 (in modern Notepad it's shown bottom-right; Notepad++/VS Code have an Encoding menu).
Why is my whole TXT file on one line?
It uses Unix line endings (LF) and you opened it in an old editor expecting Windows CR+LF. Modern Notepad, Notepad++ and VS Code display it correctly.
How do I convert a TXT file to PDF?
Open it and choose Print → Save as PDF (built into Windows, macOS and browsers), or paste it into Word/Google Docs and export to PDF. The text just gets a printable page layout.
How do I convert a TXT file to Word (DOCX)?
Open the .txt in Word, Google Docs or LibreOffice Writer and Save As .docx. You can then add formatting the plain text never had.
Is it safe to open a TXT file?
Yes - plain text can't run code. The only trick to watch for is a fake name like 'file.txt.exe'; with extensions visible you'll see it's really an .exe, which you should not run.
What's the difference between TXT and DOC/DOCX?
TXT is raw characters with no formatting; DOC/DOCX is a Word document that adds fonts, styles, images and layout. Saving a .txt as .docx wraps the same words in a formatted container.
References
1Unicode Standard (text encoding)www.unicode.org
2IANA - text/plain media typewww.iana.org
