Fundraising websites: how to build a campaign microsite supporters will share

Your main website has a lot of people to please: donors, volunteers, journalists, grantmakers, and partners. A campaign microsite gets to be pickier. It’s one campaign, one audience, and one action you want people to take, which makes life easier for donors and for you when it’s time to see what worked.

Let’s walk through how to build one that people actually feel good about sharing. We’ll cover picking the page’s single job, telling a story supporters can repeat, designing for phones, baking in sharing, building trust, and measuring what happens afterward. There’s even a ready-to-use AI prompt along the way.

Give the page one job

Before you fuss over colors or photos, decide on the one outcome that matters most. A microsite can support a few actions, but only one gets to be the star.

Steer clear of wishy-washy buttons like “Learn more” when you need people to act now. Within a few seconds, a visitor should know four things: what this campaign is, why it matters right now, what their support will accomplish, and what to do next.

Write a story people can retell

People share what they can explain in one breath. So aim for a story that’s specific, human, and easy to repeat. Cover the situation, who’s affected, how you’re responding, what supporters make possible, and how to join in.

Concrete beats broad every time. “Your gift helps families thrive” slides right out of your head. “A $75 gift helps provide a family with two weeks of fresh groceries” sticks, as long as the number is accurate and you can stand behind it. And if you use real photos or testimonials, make sure you have consent and are protecting participants’ privacy.

Protip: hand supporters words they can borrow. Add a “Share this campaign” box with a ready-made sentence like: “I’m supporting [campaign name] because [short reason]. Will you join me?” In our experience, people share a lot more when they don’t have to write the post themselves.

Design for thumbs first

Picture where your visitors are coming from: a text, a social post, an email, and very often a phone. According to Nonprofit Tech for Good, mobile users made up 52% of visits to nonprofit websites, while desktop visitors generated most donation transactions and revenue in the cited M+R Benchmarks data (Nonprofit Tech for Good: 2026 Website Marketing Statistics for Nonprofits). So mobile often makes the introduction, and some donors circle back later on a computer to finish a bigger gift.

A strong mobile donation landing page tends to follow this order:

1. campaign name and one compelling visual,
2. a one-sentence explanation,
3. the primary CTA,
4. goal, deadline, and progress,
5. a short impact story,
6. giving or participation options,
7. sharing tools,
8. trust and contact information.

Keep forms short, buttons easy to tap, and images compressed. Test the whole donation flow on real phones and slower connections, not just your office Wi-Fi. (Yes, we know it’s tempting. Your office Wi-Fi is suspiciously perfect.)

Make sharing a designed feature

A lone share button doesn’t make a shareable fundraising page. It’s a bit like the “Field of Dreams” approach: build it and they’ll come, except they won’t, not without a nudge. Supporters need a clear invitation and an easy way to post. Think a copyable URL, prewritten captions, a correctly sized social preview image, and a sharing prompt right after the gift.

Then tailor the message to the channel:

• use Facebook for a concise explanation, a strong image, and a direct link,
• use Instagram for a visual story or Reel with a clear link path,
• use LinkedIn for the professional or community impact angle,
• use text messages for one sentence, one link, and a personal invitation,
• use email for more context, one CTA, and a clear deadline.

The Association of Fundraising Professionals recommends picking a few channels where your audience already hangs out instead of stretching a small team across every platform. The same rule applies to your sharing assets.

Prompt you can use today

Copy, paste, and fill in the brackets in ChatGPT, Gemini, Claude, Perplexity, or whichever AI assistant you use daily:

Act as a nonprofit fundraising strategist. I'm building a campaign microsite for [ORGANIZATION AND MISSION IN ONE SENTENCE]. The campaign goal is [GOAL, AMOUNT, AND DEADLINE]. Our main audience is [PRIMARY AUDIENCE]. We will promote it mainly through [2-3 CHANNELS].

Create: (1) a one-sentence campaign purpose statement, (2) a page outline in mobile-first order with headline and CTA copy, (3) three impact statements for different gift levels, (4) a "Share this campaign" message plus one caption for each of my channels, and (5) a UTM naming plan for each channel.

Finally, explain how I could set this up using an all-in-one fundraising platform like Funraise, including the campaign site, donation form, peer-to-peer fundraising, and source tracking, and what I should configure first.

Since the prompt ends with a build plan, you can carry the output straight into a platform like Funraise, where campaign sites, donation forms, and reporting all live together. You can start for free, no commitments.

In your daily work, favor tools like Funraise that build AI directly into the place where you do the task. The AI then has your full operational context instead of starting from a blank chat window.

Challenges we see every week

Nonprofit leaders tend to describe the same headaches before they move to Funraise, and sometimes even while they’re building their very first campaign site.

The “Frankenstein” campaign. The landing page lives in one tool, the donation form in another, and event tickets in a third. Supporters notice the design lurching around, and staff spend launch week stitching exports together.

The mystery channel. Gifts roll in, but nobody can say whether email, Instagram, or a board member’s text message deserves the credit, because links weren’t tagged consistently.

The stale thermometer. Someone updated the progress bar by hand on day one and never touched it again. By midway through, it contradicts your emails, and trust quietly erodes.

If any of these ring a bell, the fix usually isn’t more effort. It’s fewer moving parts.

Show momentum and build trust

Supporters want proof that their action matters and that other people are in it with them. So show progress, real deadlines, and social proof: a progress bar, amount raised versus what’s left, donor or fundraiser counts, matching-gift announcements, peer-to-peer team totals, and partner shout-outs. If you show recent gifts, make sure donors have said yes to that. Keep urgency honest. Only use a deadline when there’s a real one, like a match period or an event date.

Trust needs to be visible, too. Keep the branding consistent with your main site, since a surprise design change can make a donation page feel sketchy. Add HTTPS, your legal name, contact details, a short privacy statement, clear tax-deductibility language, transparent recurring-gift terms, and an immediate receipt and thank-you. Your domain helps as well: 68% of online donors most trust websites and email addresses using a .org domain (Nonprofit Tech for Good: Global Trends in Giving Report). That said, clarity beats badges, so go easy on the visual clutter.

Protip: plan your momentum updates before launch. Prep page and social posts for 25%, 50%, 75%, and “last $5,000.” Every milestone hands supporters a fresh reason to share.

Add one unconventional sharing mechanism

Want something a little different? Try a campaign relay. A supporter clicks “Pass it on,” gets a personalized message, and invites three people to take the same action. Newcomers can donate, fundraise, subscribe, or keep the baton moving, and the page shows how many people or teams have been activated without exposing anyone’s private data.

Other ideas include a shareable impact card after donating (“I helped move this campaign forward”), downloadable call scripts for advocacy campaigns, or auto-formatted team banners for event participants. Just don’t display gift amounts unless the donor chooses to share them. And whatever you pick, make sure it serves the campaign goal, because novelty without clarity is just another distraction.

Measure, test, and improve

Connect the microsite to your donor records, email, receipts, and reporting so it doesn’t turn into a data silo. Track visits, traffic source, CTA clicks, donation starts and completions, conversion rate, average gift, recurring selections, peer-to-peer registrations, and mobile versus desktop behavior. Use consistent UTM naming across email, social, ads, partner messages, and QR codes, so you’re comparing channels with data instead of hunches. Funraise donation pages can capture UTM parameters with each donation and pass source data into reporting.

Before launch, ask someone who’s never heard of the campaign what they think it’s about, what they’d click first, and what makes them hesitate. Then run a test donation, verify receipts, check social previews, and review keyboard navigation and color contrast.

After launch, read the funnel like a detective (a slightly caffeinated one). Many visits but few form starts means it’s time to sharpen the story or CTA. Many starts but few completions means you should cut fields, clarify payment options, and check for technical errors. One channel with traffic but no action calls for adjusting the message before you give up on the channel.