Free online ASC to TXT converter

A receiving program may accept readable data only when its filename ends in .txt, even though the source application exports .asc. Renaming or resaving the file can satisfy that requirement, but it does not change delimiters, encoding, or proprietary data structures.

What the ASC format is

In the Text files category, .asc commonly identifies an ASCII or other plain-text export created by scientific, engineering, logging, GIS, configuration, and command-line software. The extension does not define a single structure: the file may contain prose, logs, fixed-width columns, comma- or space-separated values, headers, or application-specific text syntax.

Open a copy in Notepad, Notepad++, Visual Studio Code, or another plain-text editor. Readable characters and expected rows indicate a text file. Unreadable binary content means the creating application should export the data instead of a filename change.

Some .asc files contain ASCII-armored OpenPGP keys, signatures, or encrypted messages. Lines such as -----BEGIN PGP MESSAGE----- identify OpenPGP data, not an ordinary text export.

What the TXT format is

.txt is a general filename convention for unformatted character data. Text editors, scripts, command-line tools, import dialogs, and archival systems commonly recognize it without a specialized document layout.

TXT does not specify character encoding, delimiter, line-ending convention, table structure, formatting, or embedded objects. Its practical advantage is broad compatibility: software generally opens it as raw text. Saving an ASC file as TXT therefore does not convert columns to CSV, remove headers, interpret measurements, or add formatting.

How to save a readable file as TXT

1. Keep the original input.asc and work on a copy.
2. Open the copy in a plain-text editor and check the characters, line breaks, headers, delimiters, and fixed-width alignment. Do not use a word processor for machine-readable data.
3. Choose File → Save As, enter a name such as output.txt, and select plain text if the editor provides a format option.
4. Select the required encoding. Use UTF-8 for general interchange unless the receiving system requires ASCII, Windows-1252, UTF-16, or another encoding. ASCII-only content does not require an encoding conversion.
5. Reopen output.txt in the target program and verify the first and last lines, delimiters, decimal values, line breaks, and non-ASCII characters.

Notepad++, Visual Studio Code, and standard system text editors are suitable for ordinary text. In Visual Studio Code, use the encoding indicator in the status bar and choose Save with Encoding when the destination requires a particular encoding. In Notepad++, use the Encoding menu before saving.

Rename or copy without changing the contents

If the file already uses the required encoding and line endings, changing the name is sufficient. On Linux or macOS, copy it with:

cp input.asc output.txt

To rename it instead, use mv input.asc output.txt. In Windows PowerShell, use:

Copy-Item input.asc output.txt

or, when retaining the original is unnecessary:

Rename-Item -Path input.asc -NewName output.txt

These commands change only the filename or create an identical copy. They do not convert encoding, line endings, delimiters, headers, or application-specific syntax. In Windows File Explorer, enable visible file extensions before renaming; otherwise, a manually entered name can become output.txt.asc.

Convert the character encoding

Use iconv when the source encoding is known and the destination requires another one. For example:

iconv -f WINDOWS-1252 -t UTF-8 input.asc -o output.txt

Replace WINDOWS-1252 with the actual source encoding, such as ISO-8859-1. Do not guess when accented characters or symbols matter: an incorrect source setting can corrupt them. Encoding conversion can also add or remove a byte-order mark, which may affect older import programs.

Editors and conversion tools may normalize line endings. Windows commonly uses CRLF, while Linux and macOS commonly use LF; most current software accepts both, but older devices and import utilities may require one convention.

Use the built-in online converter

You can convert the file on 101convert.com for free without installing software. Download the resulting .txt file and inspect its encoding, delimiters, line endings, and contents before using it in an automated workflow. Do not upload confidential, personal, proprietary, regulated, or encrypted data.

Handle OpenPGP ASC files separately

Renaming an encrypted OpenPGP file to .txt preserves its ASCII armor but does not produce readable document text. With GnuPG installed and the required private key or passphrase available, decrypt it with:

gpg --decrypt --output output.txt input.asc

A public-key block or detached signature is not an ordinary document; changing its extension will not turn it into useful TXT content. A binary or proprietary ASC export must be opened in the software that created it and exported as plain text.