.txt file format
Open a text file, combine notes or logs, clean text copied from a scan, or create realistic errors for testing. Choose the TXT tool that fits your task.
Also known as: Plain Text
Format
.txt
Original files stay unchanged. Tools download a new file when output is generated.
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Reverse supported SVG paint values for contrast and dark backgrounds, or remove transparent canvas space by tightening the viewBox around rendered content.
Every tool listed here works with .txt files and runs in your browser. If the task you need is not here, the related formats below may cover it.
Generate typo and misspelling variations from clean text.
Generate realistic keyboard-adjacent typos for dirty text and testing data.
Insert random letters, numbers, or symbols into text for dirty datasets.
Generate realistic OCR-style text errors for dirty datasets and document parser testing.
Use TXT Viewer to open and search a plain text file. Use Merge TXT to combine notes, text exports, or log fragments in your chosen order. Use OCR Cleanup Tool when copied scan text contains recognition mistakes. The typo and OCR error generators do the opposite: they deliberately add errors to create test inputs for parsers, search, and data-cleaning workflows.
A .txt file has no structure, but it does have an encoding and a line-ending convention, and both can be wrong. Text saved as Windows-1252 and read as UTF-8 produces mojibake in place of accented characters. A byte order mark at the start of a UTF-8 file is invisible in an editor but shows up as stray characters in a parser that does not expect it.
Windows terminates lines with carriage return plus line feed; Unix and macOS use a line feed alone. Most modern editors handle either, but shell scripts, config parsers, and diff tools do not always. A file that reports every line as changed in version control is usually a line-ending conversion rather than a real edit.
It is readable by everything, diffable, greppable, streamable, and it will still open in fifty years. That is why logs, exports, notes, and data dumps default to it even when a structured format would be tidier.
An encoding mismatch. The file was written in one encoding and is being read as another — most often a Windows single-byte encoding being read as UTF-8, or the reverse.
A byte order mark is an invisible marker at the start of the file identifying the encoding. UTF-8 does not need one, and many Unix tools mishandle it, but some Windows applications rely on it to detect UTF-8 correctly.
In a browser-based viewer the practical limit is your device's memory, since the whole file is loaded locally. Very large logs are better handled in chunks.