- This page is about signing of posts on Commons. For copyright issues related to people's signature, see COM:SIG.
This project page in other languages:
Signing your posts on talk pages, both in the article and non-article namespaces, is required, and facilitates discussion by helping identify the author of a particular comment. Other users can then navigate to a talk page and address their comments to the specific, relevant user(s). Discussion is an important part of collaborative editing, because it helps all users to understand the progress and evolution of a work.
→ Read: How to sign.
When editing a page, main namespace galleries should not be signed, because the article is a shared work, based on the contributions of many people, and one editor should not be singled out above others.
Signatures supporting multilingualism 
It is recommended that active Commons users with usernames that do not use the Latin alphabet (for example, Arabic, Chinese, or Hebrew usernames) add a Latin transliteration, translation, or nickname to their signatures (via Preferences → section “Signature” → options Signature: and Treat signature as wikitext (without an automatic link)). This makes it easier for users not familiar with those scripts to recognise and interact with such users. Similarly, users with Latin alphabet usernames who regularly interact with users of another script (such as Japanese), are encouraged to add a version of their username in that script.
Rules on customized signatures 
Wikimedia Commons allows users to customize their signatures in any creative manner, but a few rules have been enforced to avoid disruption.
Transclusion of templates 
- Signature templates are vandalism targets, and will be forever, even if the user leaves the project.
- Certain automated scripts (bots) are used to automatically archive particularly active talk pages. These bots read the source of the talk page, but don't transclude templates, and so don't recognize the template as a signature.
- Signature templates are a small but unnecessary drain on the servers. Transcluded signatures require extra processing—whenever you change your signature source, all talk pages you have posted on must be re-cached.
- Substitution of templates in signatures is discouraged, as any such template will be redundant to using the same content as a raw signature.
Simple text signatures, which are stored along with the page content and use no more resources than the comments themselves, avoid these problems.
Images in signature 
Images of any kind must not be used in signatures for the following reasons:
- they are an unnecessary drain on server resources, and could cause server slowdown
- a new image can be uploaded in place of the one you chose, making your signature a target for possible vandalism and Denial-of-service attacks
- they make pages more difficult to read and scan
- they make it more difficult to copy text from a page
- they are potentially distracting from the actual message
- images do not scale with the text, making lines with images higher than those without
- they clutter up the "file links" list on the image page every time you sign on a different talk page
- images in signatures give undue prominence to a given user's contribution
One possible alternative is to use unicode characters instead.