✅ Free on Google Workspace Marketplace

Email signatures for your
entire Google Workspace
in one click

Push branded HTML signatures and campaign banners to every user in your domain — filtered by Org Unit, Group, or individual users.

Install from Marketplace ❤️ Sponsor this project

No server. No data leaves your Google account. Runs entirely inside Apps Script.

Features

Everything you need, nothing you don't

Two powerful modes to handle every signature scenario your organisation faces.

🔄

Replace Signatures

Apply a branded HTML template to all users at once. Variables like {{name}}, {{title}}, {{phone}} are filled from the Google Directory automatically.

🎯

Campaign Banners

Inject a promotional banner below each user's existing personal signature — without touching it. Update the banner next month and it replaces cleanly in place.

🏢

Flexible Targeting

Apply to all users, a specific Org Unit, a Google Group, or hand-pick individual users from a searchable list.

🔐

Zero Data Exposure

Runs entirely inside Google Apps Script. Your service account credentials are stored in Script Properties — they never leave your Google account.

⚡

One-click Install

Install directly from the Google Workspace Marketplace. No servers to provision, no code to deploy, no dependencies to manage.

🗑️

Clean Banner Removal

Remove a campaign banner from every user's signature in one click — restoring their personal content exactly as it was, with no leftover markup.

How it works

Up and running in minutes

1

Install from Marketplace

One-click install into your Google Workspace. No external accounts needed.

2

Connect a Service Account

Paste your service account JSON. The app verifies connectivity and counts your users instantly.

3

Design your signature

Write HTML with dynamic variables. Preview it with sample data before applying.

4

Apply to your domain

Pick All / Org Unit / Group / Individual and hit Apply. Done in seconds.

Comparison

Why not just use Exclaimer or WiseStamp?

Feature GWS Email Signature Manager WiseStamp Exclaimer
Price Free + optional sponsor $9–$299 / mo $0.90–$1.75 / user / mo
Google Workspace ✓ ✓ ✓
Data stays in your Google account ✓ ✗ ✗
No external server ✓ ✗ ✗
Non-destructive banner inject ✓ ✗ Partial
Target by Group / Individual ✓ Partial ✓
Dynamic directory variables ✓ ✓ ✓
One-click Marketplace install ✓ ✓ ✗
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Privacy Policy

Last updated: May 2026

1. What this application does

GWS Email Signature Manager is a Google Apps Script application that helps Google Workspace administrators set and manage Gmail email signatures for users in their domain.

2. Data we collect

We do not collect, store, or transmit any personal data to external servers. Specifically:

  • Your service account credentials are stored only in Google Apps Script Properties, which reside entirely within your Google account.
  • User directory data (name, email, title, phone) is fetched from your Google Workspace directory at the time of applying signatures and is never stored or logged.
  • Email signature content is written directly to each user's Gmail settings via the Gmail API and is not retained by this application.

3. Google APIs used

  • Admin SDK Directory API — to list users and organisational units in your domain.
  • Gmail API — to read and write Gmail signature settings for users (via domain-wide delegation).

Use of Google APIs complies with the Google API Services User Data Policy, including the Limited Use requirements.

4. Data sharing

We do not sell, share, or disclose any data to third parties. No analytics, tracking scripts, or third-party services are embedded in this application.

5. Data retention

No user data is retained. All operations are performed in real-time and no logs are kept.

6. Administrator responsibility

This application requires a Google Workspace Super Admin to authorise it and provide a service account with domain-wide delegation. The administrator is responsible for ensuring appropriate use within their organisation.

7. Contact

For privacy questions, contact us at support@gwsig.com