Proton Mail signature: add one, set a different one per address and use images

A Proton Mail signature is set under Identity and addresses in your account settings, one signature for each email address. Proton says that once you set it, it becomes the default for that address, and you can still change or remove it on any single message. These steps follow Proton’s help page Set a sender name and signature for your emails and its page How to edit your mobile signature, both read on 5 October 2026.

Add a Proton Mail signature in three steps

Proton’s page gives these steps for adding or editing a signature.

1. Sign in to account.proton.me and go to Settings, then All settings.
2. Choose the section. Select Identity and addresses from the sidebar and scroll to Display name and signature.
3. Add and save. Type your signature and click Update.

The display name is a separate field on the same screen. Proton describes it as what recipients see in the From field, and says that if you leave it blank they will usually just see your email address. The signature is the text at the end of the message body, so check which box you are typing in.

A different Proton Mail signature for each address

If you have more than one email address, Proton says you can set a different signature for each one. Click Email address and select the address you want from the menu, then add the signature and click Update.

For a small business that is a handy fit. Here is one way to split a set of invented addresses.

Address	Signature to give it	Why
hello@	Name, role, company, website	The public front door
accounts@	Name, finance role, payment query hours	Replies about invoices
founder@	Short: name and company	Brief messages to close contacts

Proton’s page does not say how many addresses an account can have. That depends on your plan, which the page does not cover, so check your own account.

Change or remove it on one message

Proton states that you can change or remove the signature for any individual message you send. The page does not say where that control sits in the composer, so look for it on a draft and test it before an important send.

Formatting and images

Under the signature field there is a toolbar. Proton says you can use it to customise text style, size and colour, and to add images, lists, quotes and more.

The page adds one warning that matters for logos. For your recipients to see images in your signature, they need to have load remote content enabled in their email provider’s settings. Some recipients will not have that switched on, so a signature that is only a logo says nothing to them.

What this page does not tell you, and what we will not guess:

• how to add the image (an upload, or an address);
• a size or file type limit;
• whether alt text can be set.

Treat the first send as a test, and send it to an address on a different provider.

A signature image that still works with images off

A safe design puts the facts in text and the logo as decoration. Below is a signature drawn by emailfooter, with the name, role, phone and web address as real text beside a logo. The company and person are invented.

Example only. The company and person are made up. If the logo is blocked, the name and phone still read.

If you build a signature like this outside Proton, the next section is the route Proton describes.

Paste a designed Proton Mail signature from a builder

Proton says you can import a formatted signature from a third-party builder. The page gives these steps.

1. Copy the formatted signature from the builder. Proton says this can be text or code.
2. Sign in to account.proton.me and go to Identity and addresses in Settings.
3. Paste the signature into the Signature field.
4. Click Update to save.

The page is silent on how much of a layout survives, so open a new message and look before you rely on it. Our guide to HTML email signatures explains what a designed one is made of, and email clients that support HTML signatures shows how other apps compare.

The Proton Mail signature on a phone

On a phone the signature behaves differently. Proton says that by default a mobile signature reading “Sent from Proton Mail mobile” is added to all emails you send from an iPhone, iPad or Android device.

Two rules apply, both from Proton’s mobile page:

• Free account: you cannot edit or disable the mobile signature. You can create a regular customised signature, and it is shown in addition to the mobile one.
• Paid plan: you can edit or delete it. Open the Proton Mail app and go to the menu, then Settings, then Signature, then Mobile signature. Edit the text, or use the switch to turn it on or off.

So a Free account that sends from the phone will carry two signatures. If that looks untidy, the page’s only remedy is a paid plan. The wider question of phone signatures is in our mobile email signature guide.

When the signature does not appear as expected

1. Wrong address. Each address has its own signature. Check the address selector in Identity and addresses.
2. Update was skipped. The steps end with Update.
3. It was removed on that message. Proton lets you change or remove it per message.
4. The logo is missing for the reader. They may have remote content off.
5. A second line on mobile. That is the mobile signature, described above.
6. Layout changed after pasting. The page does not describe how pasted code is handled. Simplify the design.

A Proton Mail signature across a company

If everyone writes their own, there will be as many versions as people. emailfooter is a free WordPress plugin where a company designs one signature and each employee adds their own details, then follows numbered steps for their mail app. Proton is one of its 16 apps. It cannot install a signature into a Proton account for anyone, so each person pastes their own, and it works in English only for now. Each person’s Proton Mail signature stays personal inside a shared design. The general method is in how to set up an email signature, and the plain version is in the plain text email signature guide.

Frequently asked questions

How do I add a signature in Proton Mail?

Sign in to account.proton.me, go to Settings, All settings, Identity and addresses, scroll to Display name and signature, add your signature and click Update.

Can I add an image to my Proton Mail signature?

Yes. Proton says the toolbar under the signature field can add images. Recipients need remote content enabled to see them.

Can I have a different Proton Mail signature for each address?

Yes. Click Email address in the same section and select the address, then set its signature.

How do I remove “Sent from Proton Mail mobile”?

Proton says editing or disabling the mobile signature needs a paid plan. Then go to Settings, Signature, Mobile signature in the app.