How to Spot a Reputable SEO Agency or SEO Freelancer: Checklist 2026

Methodology: where this checklist comes from

The criteria come from my initial calls with companies looking for or switching SEO agencies, from my ongoing project work with online shops and B2B companies, and from Google's own recommendations. Google describes in the guide "Do you need an SEO?", which questions you should ask an SEO.

How do I recognise a reputable SEO agency?

The difference between a reputable and a dubious SEO agency shows before the contract: in the offer, in the answers during the initial call and in the references. Good SEO agencies and good freelancers share these traits:

• Transparency on price and services: The fee, the pricing model, the number of hours and the minimum term are in the offer. You know which services you get every month.
• Open communication: Fixed meetings, fast answers and an SEO strategy you understand and can explain to your team.
• References with numbers: Case studies state the starting point, timeframe and result, such as visibility, organic traffic or revenue. Good agencies put you in touch with an existing client on request.
• Questions about your business: A good agency wants to know what makes your company special, who your competitors are and how your customers search. Google explicitly names this as a test.
• Honest expectations: The agency tells you which results to expect after which timeframe. First movement after 3 months and measurable revenue after 6 to 12 months are realistic.
• Clean methods: Keyword research, on-page SEO, technical SEO and link building following Google's guidelines, without bought links. The keyword analysis is driven by your revenue.
• Clear success measurement: Before the start, you agree on the metrics together: impressions, clicks, visitors from organic search, revenue and visibility in AI answers.
• You know who does the work: You talk directly to the person who works on your project.

Red flags: warning signs with SEO agencies

I see these warning signs in offers and conversations again and again:

1. Guarantee of position 1: Google itself writes: if someone guarantees you first place, find someone else. Rankings depend on Google, on competition and on implementation.
2. Rankings within a few days: Reputable search engine optimisation takes months. Sudden jumps point to manipulative techniques or to rankings for search terms nobody searches for.
3. Backlink packages: "500 backlinks for 299 euros" is black hat SEO. Bought links violate Google's spam policies and can lead to a penalty.
4. Secret methods: A reputable SEO agency explains every change to your website. Google recommends asking exactly that.
5. Access stays with the agency: Search Console, Analytics or the Google Ads account are registered to the agency. If you cancel, you lose your data.
6. Long term without justification: A 24-month contract term with no option to cancel and no goals.
7. Ranking reports for the brand name only: A report celebrating position 1 for your company name shows no performance.
8. Cold outreach with error lists: "Your website has 87 errors" from a tool, with no link to your revenue.
9. Relaunch without a redirect plan: I analysed a relaunch where an agency cut a large website down to a few generic pages. Visibility dropped sharply afterwards.

Which questions should I ask in the initial call? Google's list

Google recommends these questions, supplemented by my experience from consultations with prospects. Use them in the first call to clarify expectations, methods and collaboration before you request an offer:

• Can you show me examples of previous work and results?
• Do you follow the Google Search Essentials?
• What results do you expect, and in what timeframe?
• How do you measure success, and what does the reporting look like?
• What experience do you have in my industry and my country?
• Who exactly works on my project?
• Will you share every change to my website with the reasoning behind it?
• What happens to access, data and content if we end the collaboration?

A prospect told me how he vets new service providers: he asks whether the report also shows what did not work. That is a good test of credibility.

What do fair contract terms look like?

• Scope of services: What the monthly fee includes, how many hours, and what costs extra.
• Term with justification: A minimum term is normal in SEO, because the impact takes months. With me, it is 3 months for sparring and 6 to 9 months for projects with implementation. The term is stated in the offer, as is the fact that unused hours expire at the end of the month.
• Privacy Policy: A data processing agreement under the GDPR as soon as the agency has access to personal data, for example in Analytics or the shop backend.
• Access: The agency gets user access in your accounts. For a first audit, read access to Search Console is enough, which Google recommends as well.
• Ownership: Texts, reports and data belong to you.

Checking references and case studies

A good case study states a number, a timeframe and the starting point. An example from my work: for the jewellery brand PURELEI, visibility doubled in 8 months, with around 600,000 euros in revenue from organic search (to the case study). With client projects, also check whether the numbers fit your business: a result for a well-known brand with a large range cannot be transferred one to one to a small shop.

How important are client reviews?

Reviews on Google, on ProvenExpert or recommendations on LinkedIn are a good first filter, but they do not replace a conversation with a reference client. Also look at talks, podcasts or articles. They show whether the person behind the agency has a reputation and credibility in the market. You often find good SEO experts through recommendations from your network.

White hat or black hat SEO: how do I recognise the methods?

White hat SEO improves the website for users: better content, faster load times, clear structure, mentions on real industry sites. Black hat SEO tries to trick the search engine: bought links, hidden text, automatically generated mass pages. Ask where the backlinks come from. If you do not get a list of real websites, that is a warning sign.

Cheap or expensive SEO agency: what to look for?

A low price is not a sign of a dubious provider, but it limits the work. At 135 euros per hour, 300 euros a month buys about 2 hours. That covers a report, not optimisation. Ask how many hours the price includes. You can find an overview of typical prices on the page SEO pricing.

Reputable SEO agency or freelancer: which is better?

Both can work reputably. An agency offers a team for copy, tech and link building in parallel. With a freelancer, you talk directly to the person doing the work and do not pay for a sales team. The detailed decision guide is on the page SEO freelancer or SEO agency.

What should mid-sized companies look out for?

In mid-sized companies, several departments often have a say, and implementation depends on IT, marketing and sales. Make sure the agency has experience with multiple contacts and delivers reporting that management understands too. One industrial client explicitly wanted the report to show which department was delivering too slowly. That is a sign of good performance measurement on both sides.

In-house SEO or external SEO agency: which option pays off when?

In-house pays off when SEO permanently needs full capacity and the person brings experience. In one shop project, SEO had previously been handled by a former working student with about six months of experience. That was enough for maintaining keywords. The experience for a strategy was missing. Many companies therefore combine both: the team implements, an external SEO expert sets direction, prioritises and reviews.

Frequently asked questions about choosing an SEO agency

About the Author

Antonio Blago is an SEO freelancer based in Koblenz, Germany, working with online shops and B2B companies on SEO and visibility in AI search. He founded Visibly AI and published the Keyword Study 2026 on click-through rates in organic search.