Here is a list of features currently available in Libravatar and how it differs from Gravatar.
| Libravatar | Gravatar | |
|---|---|---|
| JPEG and PNG support | Yes | Yes |
| GIF support | Yes | No |
| Upload size limit | 10 MB | None |
| Image size (in pixels) | 1 to 512 (configurable) | 2048 |
| HTTPS support | Yes | Yes |
| IPv6 support | Yes | — |
| Supported email hashes | MD5 and SHA256 | MD5 only |
| OpenID URL support | Yes | — |
| Redirection to Gravatar | Yes | Not needed  |
| Customizable default image | Yes | Yes |
| MPAA-style image ratings | G-rated only | Yes |
| Text-based profile information | — | Yes |
| Federation via DNS SRV records | Yes | — |
| LDAP authentication | Yes | — |
| OpenID authentication | Yes | — |
| Automatic photo importers | Yes | — |
| Translated user interface | No | Yes |
| Account export | Yes | — |
| Account deletion | Yes | No |
| XMLRPC API | — | Yes |
| Libraries/plugins available | Some | Lots |
| Free and Open Source software | Yes | No |
| Distributed service | Yes | Commercial CDN |
| Corporate owner | — | Automattic |
Is something missing from this list? Let us know by filing a bug, or contributing a new feature yourself!