Make a signature for Outlook, Gmail or Apple Mail in a minute. Free, no sign-up, and nothing you type leaves your browser.
Dark mode shows how Outlook on the web, the new Outlook and Outlook on phones recolour a signature, so a logo that disappears on dark is caught before you use it. Phone shows it scaled to a phone's width.
Now paste it into your mail app's signature settings.
Open Settings (the gear), then Account, then Signatures. Select New signature, give it a name, paste into the box, and select Save. Choose it as the default for new messages and replies if you want it on every message.
Select File, Options, Mail, then Signatures. Select New, name it, paste into Edit signature and select OK. Choose it under New messages and Replies/forwards.
Open Settings (the gear), then See all settings. On the General tab, under Signature, select Create new, name it and paste. Choose it under Signature defaults, then select Save Changes at the bottom of the page.
Open Mail, then Settings, then Signatures. Select the account, select the plus button, and untick Always match my default message font. Paste into the right-hand box. Close the window to save.
Open Settings, then Mail (on iOS 18, Settings, Apps, then Mail), then Signature, and paste. iOS keeps simple formatting but can drop pictures, so set the signature on a computer where you can.
The Gmail app on Android takes a plain text signature only: open Settings, choose your account, then Mobile signature, and type it. Messages you send from Gmail on the web use the formatted signature.
Each layout comes from the Footer365 template library and is drawn by the same renderer as the Footer365 signature editor, as tables with inline styles, which is what Outlook, Gmail and Apple Mail display reliably.
The signature is put together on this page. Nothing you type is sent to Footer365 or kept by it, and there is no account to make.
Preview it as Outlook recolours it in dark mode, and at a phone's width, before you paste it into your mail app.