Guides
Email signature guides.
Last updated November 7, 2026. Written by Email Signature Gen.
Most signature problems come down to the picture: where it lives, whether the reader's mail app will load it, and how the message carries it. Each guide gives the causes, cites the mail app's own help, and says what to do as the sender and as the reader.
The guides
- Outlook signature images not showingClassic Outlook blocks picture downloads by default. The reader allows them, or the sender fixes how the picture is sent.
- Gmail signature image not showingThe picture's address usually isn't public. Then check plain text mode, the reader's image setting and trimmed replies.
- Email signature logo showing as attachmentThe logo travels inside the message instead of being linked, often in plain text. Link it from a public address and send HTML.
- Gmail signature too longGmail allows 10,000 characters, and images count. Our measured length for each layout, and how to shorten a signature.
- How to host an image for an email signatureThe image needs a public HTTPS address that doesn't expire: your website, a public cloud link, or a signature host.
Installing a signature? See install help for Gmail, Outlook and Apple Mail, or the FAQ.