A HubSpot signature generator alternative that remembers your signature

Updated June 2026

Let’s start with credit where it’s due: HubSpot’s email signature generator is genuinely free. As of June 2026 you don’t need a HubSpot account to use it — you can build a signature and copy the HTML without signing up for anything. For a free marketing tool from a CRM company, that’s better behavior than most.

The catch isn’t the price. It’s that the tool is built as a brochure, not a workshop: six templates, a promo link checkbox, no memory of what you made, and export that only goes as far as your clipboard.

What HubSpot’s generator actually gives you

The flow is a five-step wizard — contact details, images, template choice, styling, generate. As of June 2026, HubSpot’s own page describes the tool as offering 6 templates. When you click “Create Signature,” you get two outputs: copy the formatted signature, or copy the raw HTML source.

Two things to know before you click that button:

• The “Created with HubSpot” checkbox. Third-party walkthroughs of the tool describe it as checked by default, and leaving it on appends a promo link to your signature — effectively an ad in every email you send. You can untick it before generating, but only if you notice it.
• Nothing is saved. There are no accounts and no drafts. Close the tab and your signature design is gone. The generator is built for exactly one pass.

The one-session problem

A signature is not a one-time artifact. Titles change, phone numbers change, companies rebrand. With HubSpot’s generator, every one of those changes means starting the wizard from step one: re-typing your details, re-uploading your photo, re-picking your colors, and hoping you remember which template and hex codes you used last time.

OnceSig stores your signature in your browser’s localStorage — never on a server, never tied to an account. Reopen the editor, change the one field that changed, re-export. The Personal license covers one saved signature; Pro covers up to ten, which matters if you run separate signatures for work, side projects, or multiple brands.

Export depth: clipboard vs. .htm

HubSpot’s export is copy-to-clipboard, in two flavors. That’s fine for Gmail and for Outlook’s web settings page, where you paste rich text into a box.

It’s not fine for classic desktop Outlook, which reads signatures as .htm files from the %APPDATA%\Microsoft\Signatures folder. OnceSig exports both ways: copy as rich text for the paste-into-settings clients, or download a .htm file for classic Outlook — the classic Outlook guide walks through the folder install step by step.

There’s also the question of what’s in the HTML. Outlook still renders email with Microsoft Word’s engine, which mangles generic HTML in well-documented ways — double-spaced lines from <p> tags, ignored line-heights, blurry logos on high-DPI screens. Every OnceSig template is engineered against that specific renderer:

• Table-based layout, inline styles only
• No <p> tags (the usual cause of Outlook’s double-spacing bug)
• mso-line-height-rule: exactly on every line-height
• Explicit width/height attributes and CSS dimensions on images, so they stay sharp on high-DPI displays
• Dark-mode-safe colors, and output under Gmail’s 10,000-character signature limit

Side by side

When HubSpot’s generator is the better choice

Honestly: if you need one basic signature, today, for free, and you’ll paste it into Gmail and never touch it again — use HubSpot’s tool. Untick the branding box, copy the result, done. Paying $9 to avoid a tool that costs $0 only makes sense if the $0 tool’s limits will actually bite you.

It’s also the natural pick if your company already lives in HubSpot’s CRM, where signatures slot into a workflow you’re paying for anyway.

The case for paying $9 for what HubSpot gives away

You’re not paying for the HTML — you’re paying for the tool to still be your tool next month. The full OnceSig editor is free to try without entering an email address; free exports carry a small “Made with OnceSig” credit line, and a one-time $9 license key (launch price) unlocks clean export forever. No subscription, no renewal, a 14-day money-back guarantee, and checkout handled by Polar as merchant of record. Details on the pricing page.

If the HubSpot generator’s six templates and one-session design were ever going to be enough for you, you’d probably know by now. If you’ve already rebuilt your signature there twice, you have your answer.