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SIG GPG
File conversion

Convert SIG to GPG

Verified by Adam B.· reviewed by FE Editorial ·updated Aug 21, 2026
QUICK ANSWER
Is it possible to convert SIG to GPG?
Yes - SIG converts to GPG.

Rename the .sig file to .gpg - GnuPG reads both identically because they share the same binary OpenPGP format. If the file is ASCII-armored, run gpg --dearmor to convert it to binary before renaming.

Also to GPG: LOCKER · SEC · PGP

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert SIG to GPG?

Some tools or scripts require a detached signature to carry the .gpg extension rather than .sig. Both are OpenPGP signature packets and the extension is a convention, not a format boundary, so the 'conversion' is nearly always just a rename. The same OpenPGP standards (RFC 4880, RFC 9580) govern both files.

How to convert SIG to GPG

GnuPG OPEN-SOURCE

Rename the .sig file to .gpg, or run gpg --dearmor < signature.sig > signature.gpg if the file is ASCII-armored and binary output is required.

Gpg4win FREE

Install Gpg4win (bundles GnuPG and the Kleopatra GUI) on Windows, then use the included GnuPG command line to rename or dearmor the .sig file.

About these formats

.SIG OpenPGP Detached Signature

A SIG file is a small companion file that proves a download (such as an installer or ISO) is authentic and untampered. It contains a cryptographic OpenPGP signature, not readable content.…

Open .SIG details →
.GPG GnuPG Encrypted File

A .gpg file is binary data produced by GnuPG (GNU Privacy Guard), the free OpenPGP encryption tool. Most .gpg files are encrypted - to read one you need GnuPG plus the right passphrase or…

Open .GPG details →

Quality & what to watch

  • A binary .sig and .gpg are the same OpenPGP signature packet; only the file name differs and GnuPG reads both identically.
  • ASCII-armored .sig files (starting with -----BEGIN PGP SIGNATURE-----) can be converted to binary with gpg --dearmor; the signature data is unchanged.
  • Renaming or dearmoring does not make the signature self-verifying - the recipient still needs the signer's public key to run gpg --verify.

Frequently asked questions

Will GnuPG accept a renamed `.gpg` file?
Yes - GnuPG identifies OpenPGP files by their internal structure, not the extension, so a renamed .sig works identically.
What if my `.sig` is ASCII-armored?
Run gpg --dearmor < signature.sig > signature.gpg to produce a binary version; the signature content is unchanged.
Is a `.gpg` file always a detached signature?
No - .gpg is also used for GnuPG-encrypted files; a detached signature .gpg contains only a signature packet, not encrypted content.