Convert BAK to TXT

A .bak backup may need to become readable text for an import system, review, sharing, or long-term archival. The correct method depends on the program and data inside the backup, not on the .bak filename extension.

What a BAK file is

BAK is not a defined file format. It is a generic extension used by unrelated applications for backup copies. A .bak file can contain plain text, a copied document, a drawing, a compressed archive, a database backup, configuration data, or proprietary binary data.

Some programs append the extension to the original filename, such as settings.ini.bak or notes.txt.bak. These files may retain the original content type. Other files, such as a Microsoft SQL Server database.bak backup or an AutoCAD drawing backup, require the originating software.

Check the full filename, the folder where it was found, and the application that created it. A name such as notes.txt.bak suggests a text backup, but it is not proof; a file named only backup.bak provides almost no format information.

What a TXT file is

A .txt file contains unformatted characters and line breaks. It can be opened by Notepad, TextEdit, Notepad++, Visual Studio Code, terminal utilities, and most operating systems without the original authoring application.

TXT is useful for logs, notes, configuration data, source code, and exported records. It does not preserve document layout, images, formulas, macros, database relationships, drawing objects, or application-specific metadata. Use UTF-8 unless the receiving system specifies ASCII, UTF-16, or another encoding.

Check the backup before changing it

1. Copy the .bak file and keep the original unchanged.
2. Identify the source application from the filename, backup location, documentation, or the person who supplied it.
3. On macOS or Linux, run file filename.bak. Results such as ASCII text or UTF-8 Unicode text indicate that an editor can probably handle it. Results such as Zip archive, data, or another application format require further inspection or the source program.
4. Open a copy in Notepad++, Visual Studio Code, or another text editor. Readable words and consistent lines indicate text; random symbols, many null characters, or unreadable fragments usually indicate binary data. Close a binary file without saving it.

A file-identification tool can be inconclusive, especially for proprietary backups. Do not assume that a file is a SQL Server, AutoCAD, or text backup from its extension alone.

Convert a plain-text backup

If the contents are already readable text, opening and saving a copy as output.txt is sufficient. In Notepad++, use Encoding → Convert to UTF-8 if needed, then use File → Save As and enter a filename ending in .txt. In macOS TextEdit, select Format → Make Plain Text before saving, then choose UTF-8 if offered.

Renaming notes.txt.bak to notes.txt changes only the extension. It is safe only when the file is already plain text and no content conversion is needed. Saving through an editor is preferable when you need to confirm or change the character encoding.

Export backups created by specific software

For a Microsoft SQL Server backup, restore the file in SQL Server Management Studio through Databases → Restore Database. Run a query for the required table or records, then export the results as text, CSV, or tab-delimited data. You can also use the database context menu Tasks → Export Data. A SQL Server .bak file is not readable database text and cannot be meaningfully converted by renaming it.

For an AutoCAD backup, make a copy and rename drawing.bak to drawing.dwg, then open it in AutoCAD if it is confirmed to be an AutoCAD backup. Extract the required text, attributes, layer names, or object properties with AutoCAD's data-extraction tools or an appropriate script. A DWG drawing has no single useful TXT equivalent; exporting all content to text loses geometry and drawing structure.

For application settings, game saves, archives, or proprietary documents, restore or open the backup in the program that created it. Use its File → Export, File → Save As, or data-export command, selecting text, CSV, tab-delimited text, or a report format only when available.

Online conversion and compatibility limits

There is no reliable universal online BAK-to-TXT converter. Do not upload an unknown backup because it may contain passwords, customer records, databases, or private documents.

If a non-sensitive backup has been positively identified as a supported document type, restore its correct extension first and use a reputable service such as CloudConvert or Zamzar only if it lists that source format and TXT as a supported conversion pair. These services do not identify proprietary backups or safely turn arbitrary binary data into meaningful text.

For database exports, CSV or tab-delimited TXT is usually more useful than free-form text because it preserves rows and columns. Confirm the required delimiter, quote character, line ending, encoding, and header-row requirement with the receiving system. Test the resulting file with the target application before deleting the original backup.