Free Merkle Schema Markup Generator Alternative (Same Types, Cleaner UI)

The Merkle schema markup generator (now branded as Dentsu, hosted at technicalseo.com) has been the default tool for SEO professionals for years. It works fine, but it has a dated interface, limited schema type coverage, and no validation feedback as you build. We built our generator as a free alternative that supports the same schema types with a cleaner UI and live validation. Here's how the two compare.

What Merkle (Now Dentsu) Does Well

Credit where it's due. The Merkle generator (now technicalseo.com/schema-markup-generator) has been a reliable workhorse for SEO professionals since 2014. It supports the most common schema types, the output is valid JSON-LD, and it's free to use. Many of the JSON-LD generators that came after it copied the basic interface pattern.

What it does well: simple form per schema type, valid output, no signup required, no character limits, no upsells. Those are the basics, and Merkle nails them.

What it lacks: live validation as you fill in fields, modern dark/light UI, mobile usability, the newer schema types Google added in 2023-2024, and any kind of helper for fields like ISO 8601 time format.

Schema Type Coverage Comparison

Merkle supports: Article, Breadcrumb, Event, FAQ, How-to, Job Posting, Local Business, Organization, Person, Product, Recipe, Video, and Website. That's 13 types.

Our free generator supports: LocalBusiness, Product, Article, FAQ, HowTo, Event, Organization, BreadcrumbList, VideoObject, and Recipe. That's 10 types.

Merkle has slightly more types (Person, Job Posting, Website). For most users that's not a meaningful difference — Person and Website are rarely needed, and Job Posting is best handled through Google's Indexing API anyway. If you specifically need Person or JobPosting, Merkle is the better choice today.

For the 10 types both tools cover, the JSON-LD output is functionally equivalent. Both produce valid, Google-compatible schema. The difference is the user experience around building it.

UI and Workflow Differences

Where the tools diverge most is the interface:

• Visual design. Merkle uses a 2014-era light interface that feels dated next to modern dev tools. Our generator uses a dark interface matching how most developers work.
• Live preview. Both tools update the JSON output as you type, but ours uses syntax highlighting that makes it easier to scan for issues.
• Mobile usability. Merkle is desktop-first and feels cramped on mobile. Our tool is responsive and works on phones and tablets.
• Field organization. Merkle puts all fields in one long form per type. Ours groups related fields into sections with clearer labels.
• Helpers. For fields with specific format requirements (ISO 8601 dates and durations), our tool provides input helpers. Merkle expects you to know the format.

For occasional schema work, either tool gets the job done. For frequent schema work, the workflow differences add up.

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Privacy: Both Tools Run in the Browser

One thing both tools do right: schema generation runs entirely in your browser. Neither tool sends your data to a server — what you type stays on your device. The JSON-LD output is generated by JavaScript locally.

This matters because schema data often includes business info (addresses, phone numbers, internal SKUs, employee names). Some tools that look free actually upload your data to their server. Both Merkle and our generator process everything client-side.

You can verify this by opening browser dev tools, switching to the Network tab, and watching as you fill in fields. Neither tool makes requests to a server when you type or click "Generate."

When the Switch Is Worth Making

You should consider switching from Merkle to our tool if:

• You build schema frequently and want a faster workflow
• You work on mobile or tablet sometimes
• You prefer dark interface over light
• You want input helpers for formats like ISO 8601 durations
• You'd rather not be redirected through Dentsu's brand pages

You should stick with Merkle if:

• You specifically need Person, Website, or Job Posting schema (we don't have those yet)
• You're already efficient with the Merkle UI and don't want to retrain
• You're working in a team that has standardized on Merkle

For most users, the two tools are interchangeable on the schema types they share. Pick whichever interface you prefer. Both produce valid JSON-LD that works in Google's Rich Results Test and Search Console.

Same Validation Workflow Either Way

Whichever generator you use, the validation step is the same. After generating the JSON-LD, run it through:

1. Schema Markup Validator (validator.schema.org) — checks general schema.org compliance
2. Google Rich Results Test (search.google.com/test/rich-results) — checks if Google can use it for rich results

If both pass, paste the schema into your page (or your CMS, or your code), publish, and monitor Google Search Console's Enhancements section for any errors as Google crawls.

Generator choice doesn't affect validation outcomes. Both Merkle and our tool produce valid output. The differences are in how fast and pleasant the building process is, not in the final result.

Frequently Asked Questions

Is the Merkle schema generator still maintained?

Merkle was acquired by Dentsu and the tool now lives at technicalseo.com/schema-markup-generator. It still gets occasional updates but doesn't support the newest schema types Google has added in the last couple years. For most common types, it's still functional.

Why would I switch from Merkle if both work?

Mostly UX. If you build schema once a quarter, Merkle is fine. If you build it weekly or daily, the cleaner UI, mobile support, and input helpers in our tool save real time. The schema output itself is equivalent for the types both tools support.

Does Merkle have schema types you don't?

Yes — Merkle supports Person, Website, and Job Posting, which we don't have yet. If you specifically need those, use Merkle. For LocalBusiness, Product, Article, FAQ, HowTo, Event, Organization, Breadcrumb, Video, or Recipe, both tools work.

Are there any other free schema generator alternatives?

Yes. Hall Analysis has one. Schema App has a basic free tier. Google's own Structured Data Markup Helper works for some types. None of them have a clear UX advantage over Merkle or our tool — they're all generators that produce JSON-LD from a form.

Will switching tools affect my existing schema?

No. Schema is just JSON-LD code in your page source. The tool you used to generate it doesn't matter — once it's in your page, the source is the source. You can switch tools tomorrow without changing anything you've already deployed.

Does Merkle's tool require a Dentsu account?

No, both Merkle's tool and ours are free with no signup. You can use either anonymously and there's no rate limit. Watch for tools that look free but require an email — those typically upsell paid features.