When someone lands on your website for the first time, they don't know whether you're good at what you do. You tell them you are, but anyone can say that. What weighs most in that doubt is what other people with a similar need say: their testimonials, their reviews, the cases you've solved.
That said, badly done social proof subtracts more than it adds: generic sentences, names without faces, unbelievable figures or, worse still, invented opinions. This guide explains how to get real testimonials, write them up without falsifying them and display them so that they get read and believed.
Why social proof works
Buying from someone you don't know involves a risk: that they won't deliver, that it will cost more than expected, that they won't understand what you need. A testimonial reduces that uncertainty because it shifts the decision onto someone else's experience: "it worked out for someone like me". It's neither magic nor a guarantee, just useful information for deciding with less fear.
That's why the specific works better than the flattering. "Excellent service, highly recommended" tells nobody anything. "I doubted whether I could make the changes myself, and within a week I was doing them without help" answers a real doubt for the reader. Credibility comes from detail, from being able to identify who is speaking and from sounding like a person, not an advert.
Testimonial, review, case study and client logo
They are four different things, and each should be used for what it is worth:
- Short testimonial: one or two sentences from a client, with their name and job title or line of work. It's quick to read and backs up a specific promise on any page.
- Review: a rating published on an external platform (Google, an industry directory, an opinion platform). Its value is that you don't control it: the client writes it and you don't edit it.
- Case study: a full story with context, problem, solution and result. It's the format that persuades most someone about to decide, but also the one that takes most work.
- Client logo: the badge of the companies you've worked with. It gives a sense of track record, but on its own it proves nothing about the quality of your work, and you need permission to use it.
A well-built website combines several: logos or short testimonials on the home page, external reviews as proof that you didn't write them yourself, and a couple of case studies for those who want to dig deeper.
How to ask for a testimonial that says something specific
The best moment is right after a good result: when you hand over the work, when the client thanks you or when they achieve something thanks to what you did together. Waiting months cools the memory and the willingness. Ask personally, by email or message, and make it easy: if you only say "write us a review", most people put it off or reply with a vague sentence.
What works is a short list of guiding questions that can be answered in a few lines:
- What was your situation before working with us?
- What doubts did you have before hiring us?
- What changed afterwards?
- What specific result have you noticed, and how soon?
- Who would you recommend us to?
With those five answers you have real, specific material. Also offer to answer by phone and transcribe the conversation yourself, always with the client reviewing it afterwards. And make it clear from the start where it will be published and that they can say no without any problem: someone who feels pressured writes a lukewarm text, and someone who has been well looked after tends to be generous.
Editing honestly, asking permission and complying with the law
In a testimonial you may correct spelling and obvious typos, cut what adds nothing (marking the cut with an ellipsis in square brackets) and arrange a long text. You may not change the meaning, raise the intensity ("it went well" turned into "it was spectacular"), touch the figures or join sentences from different moments so they look like a single opinion. Before publishing, send the client the final version and keep their approval in writing (an email is enough), with the date and the uses they authorise.
On permissions and data protection, the prudent approach is this: a person's name, job title, photo and voice are personal data, and a company's logo belongs to its owner. To use them you need express permission, which they must be able to withdraw later, in which case you will have to remove them. Record that permission in writing and don't assume it because "they told us verbally". If third parties appear in a video or photo, such as the client's employees, check that they agree as well. The GDPR (RGPD in Spain) has nuances and every case is different: if in doubt, consult an adviser or the Spanish Data Protection Agency.
An anonymous testimonial ("a client from Madrid") loses a lot of credibility. If someone doesn't want to appear by name, a verifiable but non-identifying description is better, with their permission (for example, "owner of a clothing shop"), accepting that it will carry less weight. What you must not do is invent a first name or initials to disguise it.
As for the law, in the EU fake reviews and misleading advertising are prohibited by the rules on unfair commercial practices, which in Spain are mainly set out in the Unfair Competition Act (Ley de Competencia Desleal) and in consumer legislation. In practice:
- Don't write reviews yourself or commission them from third parties.
- Don't invent clients, cases or results.
- Don't pay or give anything in exchange for opinions without declaring it clearly.
- Don't show an overall rating after filtering out everything but the positive opinions.
The rules may also require you to explain how you check that the opinions you publish come from real customers. Since they get updated, go over the details with a legal adviser.
How to write a case study
A good case study is a short story in five parts, always with the client's permission:
- Client and context: who they are, what they do, approximate size, since when.
- Challenge: what problem or need there was, in their own words.
- What was done: the main decisions and actions, without jargon.
- Result: real, measurable data, with the period they refer to.
- A quote: a sentence from the client that closes the story.
As a template you can use this one (fictional example, with blanks to fill in with real data):
Fictional example. Client: a small handmade ceramics shop shipping all over Spain. Challenge: nearly all sales came through private messages and orders got lost along the way. What was done: [specific actions]. Result: [real figure] in [period], measured with [source]. Quote: "[sentence approved by the client]".
If your results aren't spectacular, don't inflate them. A modest but verifiable figure generates more trust than a round number nobody believes. Always give context and timeframe: "monthly enquiries went from 12 to 15 in four months" is honest and checkable, whereas "we multiplied enquiries" with nothing more is not. If you have no figures, describe the qualitative side (less time on manual tasks, fewer errors, a calmer client) and say it wasn't measured. And when a result also depended on factors outside your work, such as the season or one of the client's own campaigns, say so.
Where to place them and how to design them so they get read
Social proof pays off most where the doubt appears:
- Home page: one or two testimonials or logos that inspire confidence at first glance.
- Service pages: the testimonial that talks about that specific service, not a generic one.
- Next to contact buttons and forms: a short sentence right before the step that causes fear.
- Pricing pages: where visitors wonder whether it's worth paying.
As for design: use a real photo of the person (not stock), full name and job title or line of work, and text that reads without effort. Avoid carousels that change on their own: hardly anyone waits for the second slide, and on mobile they're awkward. It's better to show two or three fixed, well-chosen testimonials and link to a page with the rest or to the full case studies.
A video testimonial doesn't need production: a one- or two-minute recording on a phone, good light, clear sound (the voice matters more than the image) and the same guiding questions. Ask for express permission to record and publish, add subtitles and a short transcript, and don't make it autoplay with sound.
On Google and other platform reviews embedded in your site versus your own testimonials: the former convince more because you don't control them, but they depend on the platform and on looking good in your design. Your own are easier to adapt to each page's message. The ideal is to use both and never present your own as if they came from an external platform.
Regarding structured data markup, Google has restrictions on "self-serving" reviews, that is, those an organisation publishes about itself on its own website. Don't expect that markup to give you stars in search results. These policies change, so check Google Search Central's current documentation on reviews before implementing anything, and remember that markup must correspond to content visible on the page.
Measuring the effect, typical mistakes and checklist
Don't assume it works: measure it. Compare the conversion rate (visits that end in a message, call or purchase) of pages with and without social proof, or before and after adding it, making sure it doesn't coincide with other changes. If you have enough traffic, an A/B test with and without testimonials gives a more reliable answer; with little traffic the results will be noise, and it's better to look at trends over several weeks.
The most common mistakes are these:
- Generic testimonials, with no name or detail.
- Invented opinions, or ones "touched up" until their meaning changed.
- Using a name, photo or logo without permission, or without being able to prove it.
- Figures with no context or timeframe, or impossible to check.
- Old testimonials nobody has looked at again.
- Hiding them at the bottom of a page nobody scrolls all the way down.
Before publishing, check:
- Is it a real opinion, with written approval?
- Do I have permission for the name, job title, photo, video and logo?
- Is it specific and does it say what changed?
- Are the figures real, with context and timeframe?
- Is it where the decision is made, and does it read well on mobile?
- Do I know how to take it down if the client asks?
Frequently asked questions
Can I publish a testimonial that arrived by email without asking for express permission?
The prudent answer is no. Someone writing you something kind isn't the same as authorising its publication with their name, job title or photo. Reply asking for permission to use it and saying where it will appear, and keep that reply. For doubtful cases, consult an adviser.
What do I do if I don't have any clients yet to ask for testimonials?
Don't invent them. You can explain your method, show your own or trial work stating that clearly, or offer a first collaboration in exchange for an honest opinion, declaring that circumstance and without making it conditional on being positive. As real clients arrive, replace the provisional material.
What do I do about a negative review?
Don't delete it if it's on an external platform, and don't argue. Reply calmly, acknowledge what's fair and explain what you've done to resolve it. People who read reviews judge how you handle problems, and a website with nothing but praise is less believable.