A portfolio is the most manipulated document in the agency business. Screenshots can hide slow load times. Pretty visuals can obscure thin functionality. And an agency can list a client’s name in their portfolio even if they only built the homepage while another firm did everything else. Knowing what to look for — and what to test — is how you avoid hiring based on aesthetics and ending up with a site that doesn’t perform.
What Most People Look At (and Why It’s Not Enough)
When business owners evaluate portfolios, they almost always start with visual design. Does it look good? Is the style modern? Do I like it? These are reasonable starting points, but they explain almost nothing about whether an agency can deliver results.
Visual quality is table stakes. Any competent designer can produce a screenshot that looks polished. What the screenshot won’t tell you is whether the site loads in 2 seconds or 9, whether it converts visitors or just impresses them, or whether the code underneath is maintainable or a nightmare of nested plugins and overridden styles.
The agencies that win on aesthetics but lose on execution know this. Their portfolios are carefully curated image galleries, not functional references.
How to Actually Test Portfolio Sites
The first thing to do with any portfolio site isn’t to look at it — it’s to run it.
Open a few of the sites listed in the portfolio and test them directly:
- PageSpeed Insights (pagespeed.web.dev): Run both mobile and desktop. Any site below 75 on mobile is a problem. Below 50 is a serious problem that the agency let leave their shop.
- GTmetrix or WebPageTest: Total page weight and number of requests matter. A 6MB homepage with 180 HTTP requests tells you something about how the site was built.
- View Source or Chrome DevTools: Look at the code. Is there a theme or page builder fingerprint? Elementor, Divi, and WPBakery leave unmistakable traces. If the agency claimed to build a “custom website” and the source is full of
.elementor-widgetclasses, you have your answer.
Sandra runs a boutique consulting firm in Austin. She was evaluating two agencies. Agency A had a gorgeous portfolio with 15 examples. She tested three of them on PageSpeed — scores of 31, 44, and 29 on mobile. She passed. Agency B had eight portfolio examples, less visual variety, but scores in the 85–93 range. She hired Agency B, and her own site launched at 91 on mobile.
What to Ask About Each Portfolio Piece
Don’t just look at the finished product. Ask about the work behind it.
What was the problem you were solving?
Good agencies lead with the brief, not the output. “The client needed to improve checkout conversion on mobile” is more useful than “we built a beautiful e-commerce site.” If an agency can’t articulate the problem their work was solving, they probably weren’t thinking about it.
What metrics changed after launch?
Traffic, conversion rate, load time, revenue — any agency that tracks results will have at least some data. “It looks better” is not a result. If they can tell you the client went from a 1.2% checkout conversion rate to 2.8% after the redesign, or that organic traffic grew 40% in the following quarter, that’s meaningful. If they can’t tell you anything that happened after they handed over the files, it suggests they weren’t paying attention.
Who actually built it?
This is a question agencies hate. Some firms handle the design in-house and outsource development to a freelancer pool in another country. Others have a senior team that pitches and a junior team that builds. Ask directly. The answer reveals more about the agency than any portfolio screenshot.
Do you still have a relationship with that client?
Long-term client relationships are a meaningful signal. An agency that builds a site and disappears has a different operating model than one that is still running maintenance and improvements for clients from three years ago. It doesn’t mean a one-off project was bad work — but repeat clients indicate that the first engagement went well enough to continue.
What Portfolio Red Flags Actually Look Like
Some things in a portfolio presentation should make you pause.
No live links. If an agency shows you only screenshots and never links to live sites, assume there’s a reason. Maybe the sites underperform on technical metrics. Maybe the clients no longer use them. Ask for live URLs before proceeding.
Every project looks the same. A portfolio with fifteen sites that all have the same layout structure, font treatment, and color approach suggests the agency is working from a template they’ve dressed up differently each time. Custom work should reflect the client, not the agency’s house style.
The portfolio is years old. Web standards evolve. A portfolio that tops out in 2021 should prompt the question: what have they built recently? Either they haven’t won projects, or the recent work isn’t portfolio-worthy. Neither is reassuring.
Vague client names. “A major retail brand” or “a leading financial services company” without being able to name or link to the work is a sign. Confidentiality agreements are real, but they’re also sometimes used to obscure poor work.
They claim credit for high-profile sites but can’t explain their role. Working on a Redesign for a Fortune 500 company could mean leading the project or building one landing page while a team of 40 handled everything else. Ask for specifics.
Our portfolio links to live sites. Every one of them is testable. That’s not a brag — it’s the minimum standard. If you’re evaluating multiple agencies, make it a requirement.
How to Evaluate Design Quality Beyond Aesthetics
Visual quality does matter — just not in the way most people assess it. The question isn’t “do I like how this looks?” The question is: does this design serve the user’s goals?
Look at:
- Hierarchy. Can you tell within three seconds what the site wants you to do? Is the primary CTA obvious?
- Mobile layout. Open each portfolio site on your phone. Does the design adapt well, or does it feel like a shrunken desktop version?
- Typography. Is the text readable? Is there enough line height and contrast? Typography done wrong creates friction even when the layout looks fine.
- Page weight and imagery. Beautiful photography that hasn’t been compressed properly kills load time. If every page is full of unoptimized hero images, someone made the choice to prioritize look over performance.
David ran a law firm in Chicago and made the mistake of hiring an agency primarily because he loved the visual style of their portfolio. The sites looked luxurious. None of them ran above 40 on mobile PageSpeed. His own site launched beautifully — and took 11 seconds to load on a 4G connection. Within a month, he was talking to a second agency about a rebuild.
What Good Portfolio Presentation Looks Like
An agency that presents their portfolio honestly will:
- Show the before state, not just the after
- Include performance metrics where relevant
- Describe the client’s original problem
- Link to live projects, not just screenshots
- Acknowledge what didn’t go perfectly and what they’d do differently
That last one is rare. Most agencies present every project as a flawless success story. But projects are messy — scope changes, technical constraints, client feedback that takes the work somewhere unexpected. An agency that can discuss that honestly is an agency comfortable with reality.
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Frequently Asked Questions
How many portfolio examples should I review before making a decision? Three to five live examples are enough — as long as you’re actually testing them rather than just looking at screenshots. More examples without testing gives you a false sense of depth. Quality of evaluation matters more than quantity of examples reviewed.
Should the portfolio include sites in my industry? Industry experience is useful but not required. A strong agency can build for a new vertical. What matters more is whether they’ve solved similar problems — complex navigation, e-commerce checkout, large content libraries — regardless of the industry those clients were in.
Is it okay if portfolio sites have been redesigned since the agency built them? Yes — clients update sites after delivery, and that’s normal. The relevant question is whether the base work was solid. If the agency can show you what they delivered at launch (screenshots, staging links), that’s sufficient.
Can I contact the clients in an agency’s portfolio? Yes, and you should. Most agencies will provide references. If they resist, that’s informative. A client who was happy with the work will usually say so in a quick five-minute call. See also our separate guide on what questions to ask web design references.
What if I don’t have a technical background — how do I evaluate the code quality? You don’t need to read code. Run PageSpeed Insights on every portfolio site and look at the scores. Below 75 on mobile is a clear signal. If you want to go further, right-click and “View Page Source” — if you see obvious page builder markup (Elementor, Divi, WPBakery), the site was not custom-coded regardless of what the agency claims.
Is a smaller portfolio a red flag? Not necessarily. Some agencies are selective about what they publish and have quality controls that mean they’d rather show fewer strong examples than many mediocre ones. A portfolio of six excellent, testable, well-performing sites is stronger than a gallery of 30 screenshots.