Stays working
Missing signatures? Auto-insert adds yours to new emails and replies. A health line shows it’s working, and “Copy for Gmail settings” gives you a rich-copy backup.
InboxSig for Gmail · Free Chrome extension
An email signature for Gmail that just stays put.
Your signature vanished after an update. Or “free” turned into a monthly bill. Let’s fix that. Pick a design, add your details, and let InboxSig sign your new emails and replies.
Add to Gmail — freeFree forever · No account · Works in new emails and replies
Desktop Chrome only. Free signatures include a small grey “Made with InboxSig” link on new emails. Never on replies.
New message
Hi there,
Here’s the design we talked about.
Let me know what you think.
Best,
|
Made with InboxSig
Send ✍ Work ▾
You shouldn’t have to think about this
Sound familiar?
You just want your name at the bottom of an email. These are real reviews of other Gmail signature extensions.
“EVERY TIME Chrome is updated, this app stops working…”
“no longer automatically inserts the signature and you have to manually add it in for each email”
“My signatures keep duplicating everytime I move out of the email… 5 duplicate signatures”
“It literally says FREE signature generator, and now expects me to pay $4.99 a month”
“price doubled for the second year in a row”
“I can't completely log in so I can't make/save any changes… It just hangs”
85about signatures breaking or not inserting
33about “free” that wasn’t: ad lines, paywalls, price rises
17about wrong or duplicated signatures
Source: 163 public 1–3★ Chrome Web Store reviews of WiseStamp and other Gmail signature extensions, analysed 29 Oct 2026. These are reviews of other products, not InboxSig testimonials.
Why we built it
Your sign-off shouldn’t be another subscription.
We’re SupaDesign, a small studio. We got tired of signatures disappearing, duplicating, and being held hostage behind subscriptions.
So we built InboxSig to run in your browser. You pick a template. You fill in your details. You write an email. Your signature goes where it belongs.
No account to get locked out of. No monthly bill to keep your name on your emails.
Set it up. Get back to work.
Three steps. Then it’s just part of Gmail.
- 01
Add to Chrome
Install the free extension. No account. No sign-up.
- 02
Fill in your details
Choose from 12 table-based templates: 8 free, 4 Pro. Edit visually with a live Gmail preview.
- 03
Write an email
Your signature is added automatically to new emails and replies in Gmail on desktop Chrome.
Explore the templates →Read the setup guides →
Never duplicates
Five signatures in one draft? InboxSig checks for an existing signature, even in reopened drafts. It only inserts into empty compose windows and replaces Gmail’s own signature instead of stacking two.
Right signature for each account
Wrong work details on a personal email? Pro matches signatures to Gmail accounts and “Send mail as” aliases. The ✍ switcher changes or removes one for just that email.
Free means free
Surprise subscription? All 8 free templates, the editor, auto-insert, image hosting and copy buttons stay free forever. A small grey link appears on new emails only, never replies.
Private by design
Login holding your signature hostage? There is no login. Signatures live in your browser. No analytics, tracking pixels, remote code or pop-ups inside Gmail.
Images that show up
Logo gone missing? The editor warns about base64 images Gmail drops. Uploads are resized in your browser and hosted over HTTPS by InboxSig for every recipient.
Fair questions
Before you add another extension.
Is it really free?
Yes. All 8 free templates, the visual editor, auto-insert for new emails and replies, image hosting and copy buttons. Free forever.
What’s the catch?
A small grey “Made with InboxSig” text link on new emails only. Never on replies. Pro removes it for €29 once. No subscription.
Will it break when Chrome updates?
Nothing runs on our servers to break for auto-insert. It uses Gmail’s long-stable compose markers, and a health line shows it’s working. The copy-to-Gmail backup is always there. We can’t promise Gmail never changes. If it does, the fix ships in an update.
Do you read my email?
No. InboxSig checks the compose window to place your signature and avoid duplicates. Your email is not collected or sent to us. Signatures are stored locally in your browser.
Gmail on my phone?
Auto-insert is for desktop Chrome. Use the plain-text mobile signature copy button for the Gmail phone app. Or use “Copy for Gmail settings” to paste a rich signature into Gmail’s desktop settings.
Put the options side by side
Your signature. Your choice.
Here’s what you pay, and where your signature lives.
On smaller screens, scroll the table sideways to compare every provider.
| What you get | InboxSig | WiseStamp | MySignature | cloudHQ | Email Signature Rescue |
|---|---|---|---|---|---|
| Price for one person | Free; Pro €29 once | Pro+ $9/mo, billed annually | From $6/mo | Premium $9.90/user/mo | $99/yr (3 signatures) |
| Pay once option | Yes | No | No | No | No |
| Account needed to start | No | Yes | Yes | Check provider | Yes |
| Where your signature data lives | Your browser | Provider's servers | Provider's servers | Check provider | Provider's servers |
| Free plan branding | Small link on new emails only; none on replies | Yes | Yes | Check provider | No free plan |
A price you can leave alone
Start free. Pay once if you need more.
Free
€0 forever
- All 8 free templates
- Visual editor with live Gmail preview
- Auto-insert in new emails and replies
- Image hosting and copy buttons
- Per-email signature switcher
- Small grey InboxSig link on new emails only, never replies
Pro
€29 once
- Everything in Free, with no InboxSig link
- Unlimited signatures
- A different signature per Gmail account or “Send mail as” alias
- Executive, Spotlight, Connect and Portrait templates
- Banner image and call-to-action button
- Team template export/import with a locked company design
- Purchase code to restore Pro on another computer
How to get Pro
Install InboxSig first. Open the extension’s Pro tab and buy through RevenueCat/Stripe checkout. Pro is tied to your browser, with no account. Keep your purchase code to restore it on another computer. Refunds within 14 days on request: darren@getsupadesign.com.
Buying for a team? The InboxSig web app offers Team Lifetime: €149 once for up to 15 people (first 50 licences).
The details
A few more things you might want to know.
How do I install InboxSig for Gmail?
Add the free Chrome extension, open its visual editor, pick a template and fill in your details. The live Gmail preview shows your signature before you write. Auto-insert works in Gmail on desktop Chrome.
Where are my signatures stored?
Only in your browser, using chrome.storage.local. No account or sign-up. Uploaded images are hosted over HTTPS by InboxSig so recipients can see them. Read our privacy policy.
What permissions does the extension need?
Storage and access to mail.google.com only. Storage saves your signatures locally; Gmail access lets the extension add them to compose windows. No remote code, analytics, tracking pixels or pop-ups inside Gmail.
Can I use different signatures for different Gmail accounts?
Yes, with Pro. Set a different signature for each Gmail account or “Send mail as” alias. Pro also includes unlimited signatures. The small ✍ chip lets you change or remove the signature for one email.
Is Pro a subscription, and can I get a refund?
Pro is €29 once, for lifetime access. Buy it in the extension’s Pro tab through RevenueCat/Stripe checkout. A purchase code restores Pro on another computer. For a refund within 14 days, email darren@getsupadesign.com.
Does it work in the Gmail phone app?
Automatic insertion works on desktop Chrome only. Copy the editor’s plain-text mobile signature into the Gmail phone app, which supports text signatures only.
Can I use it with Outlook or Apple Mail?
The extension supports Gmail only. Use our free web generator to copy a signature for Outlook or Apple Mail. See the installation guides for help.
What happens when I uninstall?
Removing the extension removes everything it stores in your browser. Signatures in emails you already sent stay as they are. Before uninstalling, use “Copy for Gmail settings” if you want to keep a copy in Gmail’s own settings.
Will my logo or photo show up?
Gmail drops embedded base64 images, so the editor warns you about them. Uploads are resized in your browser and hosted over HTTPS by InboxSig so they show for every recipient. Image hosting is included free.
Can my team use the same design?
Pro includes team template export/import: colleagues import a locked company design. For the InboxSig web app, Team Lifetime is €149 once for up to 15 people, for the first 50 licences.
Write the email. We’ll add the signature.
Your name. In the right place.
Without another monthly bill.
Free forever. No account. New emails and replies, signed.
Add to Gmail — freeGmail on desktop Chrome. Small InboxSig link on free new emails only.