SDIM
(https://www.sdim.nl) 📸 Data Snapshot: May 20, 2026
Identity & Authority — The Lens
Inspect the JSON-LD. Is there an Organization or Person schema, and does it carry sameAs links to real external profiles (LinkedIn, socials)? Missing schema or no identity declaration signals an anonymous entity.
Identity & Authority
Expert verifiability & Schema depth.
14
Impact Weight: 15 / 100
93% Reputation
The authority footprint is robust and verified through schema. The site uses detailed Organization and LocalBusiness schema including VATID, DUNS numbers, and sameAs links to 5+ social profiles. Named experts like Ruud Oostdam and Dave Swart are linked to specific content, though the typo in the H3 ‘Alle over digital marketing?’ on the digital marketing page suggests a minor lack of editorial oversight.
Unlike most agencies that hide metrics behind ‘Contact Us’ walls, SDIM leads with performance. The site links marketing tone directly to quantifiable success, such as the ‘ROAS of 2137%’ for Stadsschouwburg and ‘32.3% more conversions’ for Fundustry. There is no disconnect between the agency’s claims of success and the evidence provided.
Identity & Authority is read from the structured data first: whether the site declares who it is in machine-readable schema, with verifiable identity links. Below is the schema captured per page, then the external proof links that support (or fail to support) that identity.
🔗 Identity & Technical Layer — schema JSON-LD: identity chains, entity gaps
Homepage schema
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "Organization",
"@id": "https://www.sdim.nl/#organization",
"name": "SDIM",
"url": "https://www.sdim.nl/",
"logo": {
"@type": "ImageObject",
"@id": "https://www.sdim.nl#logo",
"url": "https://www.sdim.nl/app/uploads/2024/05/sdim-vierkant-logo.png",
"contentUrl": "https://www.sdim.nl/app/uploads/2024/05/sdim-vierkant-logo.png",
"caption": "SDIM",
"inLanguage": "NL",
"width": "768",
"height": "768"
}
},
{
"@type": "WebSite",
"@id": "https://www.sdim.nl/#website",
"url": "https://www.sdim.nl/",
"name": "SDIM",
"publisher": {
"@id": "https://www.sdim.nl/#organization"
},
"inLanguage": "NL",
"potentialAction": {
"@type": "SearchAction",
"target": "https://www.sdim.nl/?s={search_term_string}",
"query-input": "required name=search_term_string"
}
},
{
"@type": "WebPage",
"@id": "https://www.sdim.nl/#webpage",
"url": "https://www.sdim.nl/",
"name": "SDIM » Digital Marketing Agency",
"datePublished": "2011-09-12T10:31:00+02:00",
"dateModified": "2026-04-13T17:31:38+02:00",
"about": {
"@id": "https://www.sdim.nl/#organization"
},
"isPartOf": {
"@id": "https://www.sdim.nl/#website"
},
"primaryImageOfPage": {
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-oscar-van-wijk-dirko-borst.jpg",
"url": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-oscar-van-wijk-dirko-borst.jpg",
"width": "2000",
"height": "1333",
"caption": "SDIM collega's Oscar van Wijk en Dirko Borst",
"inLanguage": "NL"
},
"inLanguage": "NL",
"author": {
"@type": "Person",
"name": "Sjoerd Blankevoort",
"url": "https://www.sdim.nl/team/sjoerd-blankevoort/"
},
"keywords": "SDIM,digital marketing agency"
},
{
"@type": "LocalBusiness",
"name": "SDIM",
"telephone": "023-7114401",
"email": "contact@sdim.nl",
"openingHours": "Mo-Fr 08:30-18:30",
"url": "https://www.sdim.nl",
"logo": "https://www.sdim.nl/app/uploads/2024/05/sdim-vierkant-logo.png",
"image": "https://www.sdim.nl/app/uploads/2024/06/sdim-collegas.jpeg",
"photo": "https://www.sdim.nl/app/uploads/2024/05/sdim-team-scaled.jpg",
"hasMap": "https://maps.app.goo.gl/RYLMFhPVy5DoyMVV6",
"award": "Emerce 100, FD Gazelle Award, FONK150 Best Agencies",
"address": {
"@type": "PostalAddress",
"streetAddress": "Dreef 40",
"addressLocality": "Haarlem",
"postalCode": "2012HS",
"addressRegion": "Noord-Holland",
"addressCountry": "NL"
},
"geo": {
"@type": "GeoCoordinates",
"latitude": "52.370488",
"longitude": "4.628455"
},
"founder": {
"@type": "Person",
"name": "Jan Dirkzwager"
},
"foundingDate": "2006-11-15",
"vatID": "NL850506426B01",
"duns": "490170039",
"smokingAllowed": "false",
"numberOfEmployees": "52",
"sameAs": [
"https://twitter.com/sd_im",
"https://www.facebook.com/sdimdigitalmarketing",
"https://www.youtube.com/c/SdimNl",
"https://www.instagram.com/sdim_digitalmarketing/",
"https://www.linkedin.com/company/sdim-digital-marketing/"
],
"mainEntityOfPage": {
"@id": "https://www.sdim.nl/#webpage"
}
},
{
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-koffie-ruud-birgit-sabine.jpg",
"url": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-koffie-ruud-birgit-sabine.jpg",
"width": "2000",
"height": "1333",
"contentUrl": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-koffie-ruud-birgit-sabine.jpg"
}
]
}
/strategie/
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "WebPage",
"@id": "https://www.sdim.nl/strategie/#webpage",
"url": "https://www.sdim.nl/strategie/#webpage",
"name": "Marketingplannen en strategie op maat » SDIM",
"isPartOf": {
"@id": "https://www.sdim.nl/#website"
},
"inLanguage": "NL",
"datePublished": "2024-04-30T14:09:16+02:00",
"dateModified": "2026-02-25T14:20:21+01:00",
"primaryImageOfPage": {
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-sabine-marc.jpg",
"url": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-sabine-marc.jpg",
"width": "2000",
"height": "1333",
"caption": "SDIM collega's Sabine en Marc",
"contentUrl": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-sabine-marc.jpg"
},
"author": {
"@type": "Person",
"name": "Ruud Oostdam",
"url": "https://www.sdim.nl/team/ruud-oostdam/"
},
"keywords": "strategie,marketingstrategie,digital marketing strategie",
"breadcrumb": {
"@type": "BreadcrumbList",
"@id": "https://www.sdim.nl/strategie/#breadcrumb",
"itemListElement": [
{
"@type": "ListItem",
"position": "1",
"item": {
"@id": "https://www.sdim.nl",
"name": "SDIM"
}
},
{
"@type": "ListItem",
"position": "2",
"item": {
"@id": "https://www.sdim.nl/strategie/",
"name": "Strategie"
}
}
]
}
},
{
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2024/09/webanalytics-icon.png",
"url": "https://www.sdim.nl/app/uploads/2024/09/webanalytics-icon.png",
"width": "625",
"height": "625",
"contentUrl": "https://www.sdim.nl/app/uploads/2024/09/webanalytics-icon.png"
}
]
}
/digital-marketing/
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "WebPage",
"@id": "https://www.sdim.nl/digital-marketing/#webpage",
"url": "https://www.sdim.nl/digital-marketing/#webpage",
"name": "Digital Marketing Succes » ontdek de expertise van SDIM",
"isPartOf": {
"@id": "https://www.sdim.nl/#website"
},
"inLanguage": "NL",
"datePublished": "2024-11-26T01:11:00+01:00",
"dateModified": "2026-02-25T14:24:33+01:00",
"primaryImageOfPage": {
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-melissa-sabine-kantoor.jpg",
"url": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-melissa-sabine-kantoor.jpg",
"width": "2000",
"height": "1333",
"caption": "SDIM collega's Melissa en Sabine op kantoor",
"contentUrl": "https://www.sdim.nl/app/uploads/2026/02/sdim-collegas-melissa-sabine-kantoor.jpg"
},
"author": {
"@type": "Person",
"name": "Sabine Ligtenberg",
"url": "https://www.sdim.nl/team/sabine-ligtenberg/"
},
"keywords": "digital marketing,online marketing,digitale marketing",
"breadcrumb": {
"@type": "BreadcrumbList",
"@id": "https://www.sdim.nl/digital-marketing/#breadcrumb",
"itemListElement": [
{
"@type": "ListItem",
"position": "1",
"item": {
"@id": "https://www.sdim.nl",
"name": "SDIM"
}
},
{
"@type": "ListItem",
"position": "2",
"item": {
"@id": "https://www.sdim.nl/digital-marketing/",
"name": "Digital marketing"
}
}
]
}
},
{
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2024/08/funnel.png",
"url": "https://www.sdim.nl/app/uploads/2024/08/funnel.png",
"width": "525",
"height": "511",
"contentUrl": "https://www.sdim.nl/app/uploads/2024/08/funnel.png"
}
]
}
/content-creatie/
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "Organization",
"@id": "https://www.sdim.nl/#organization",
"name": "SDIM",
"url": "https://www.sdim.nl/",
"logo": {
"@type": "ImageObject",
"@id": "https://www.sdim.nl#logo",
"url": "https://www.sdim.nl/app/uploads/2024/05/sdim-vierkant-logo.png",
"contentUrl": "https://www.sdim.nl/app/uploads/2024/05/sdim-vierkant-logo.png",
"caption": "SDIM",
"inLanguage": "NL",
"width": "768",
"height": "768"
}
},
{
"@type": "WebSite",
"@id": "https://www.sdim.nl/#website",
"url": "https://www.sdim.nl/",
"name": "SDIM",
"publisher": {
"@id": "https://www.sdim.nl/#organization"
},
"inLanguage": "NL"
},
{
"@type": "WebPage",
"@id": "https://www.sdim.nl/content-creatie/#webpage",
"url": "https://www.sdim.nl/content-creatie/",
"name": "Van concept tot creatie » Datagedreven content » SDIM",
"datePublished": "2024-04-30T14:09:35+02:00",
"dateModified": "2026-04-08T16:23:32+02:00",
"isPartOf": {
"@id": "https://www.sdim.nl/#website"
},
"primaryImageOfPage": {
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2024/05/content-creatie-scaled.jpg",
"url": "https://www.sdim.nl/app/uploads/2024/05/content-creatie-scaled.jpg",
"width": "2560",
"height": "1661",
"caption": "Content en creatie bij SDIM",
"inLanguage": "NL"
},
"inLanguage": "NL",
"breadcrumb": {
"@type": "BreadcrumbList",
"@id": "https://www.sdim.nl/content-creatie/#breadcrumb",
"itemListElement": [
{
"@type": "ListItem",
"position": "1",
"item": {
"@id": "https://www.sdim.nl",
"name": "SDIM"
}
},
{
"@type": "ListItem",
"position": "2",
"item": {
"@id": "https://www.sdim.nl/content-creatie/",
"name": "Concept & creatie"
}
}
]
},
"author": {
"@type": "Person",
"name": "Sjoerd Blankevoort",
"url": "https://www.sdim.nl/team/sjoerd-blankevoort/"
}
},
{
"@type": "VideoObject",
"name": "Van concept tot creatie » Datagedreven content » SDIM",
"description": "Versterk je merk met op maat gemaakte campagnes die opvallen en aansluiten bij jouw doelgroep. Ontdek hoe onze datagedreven aanpak jouw organisatie versterkt!",
"uploadDate": "2024-04-30T14:09:35+02:00",
"thumbnailUrl": "https://www.sdim.nl/app/uploads/2024/05/content-creatie-scaled.jpg",
"contentUrl": "https://www.sdim.nl/app/uploads/2025/04/SDIM-creative-showreel.mp4",
"width": "1920",
"height": "1080",
"isFamilyFriendly": "1",
"@id": "https://www.sdim.nl/content-creatie/#schema-192794",
"isPartOf": {
"@id": "https://www.sdim.nl/content-creatie/#webpage"
},
"publisher": {
"@id": "https://www.sdim.nl/#organization"
},
"inLanguage": "NL",
"mainEntityOfPage": {
"@id": "https://www.sdim.nl/content-creatie/#webpage"
}
}
]
}
/data-automation/
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "WebPage",
"@id": "https://www.sdim.nl/data-automation/#webpage",
"url": "https://www.sdim.nl/data-automation/#webpage",
"name": "Data & automation » SDIM",
"isPartOf": {
"@id": "https://www.sdim.nl/#website"
},
"inLanguage": "NL",
"datePublished": "2024-04-30T14:10:38+02:00",
"dateModified": "2026-02-25T14:29:30+01:00",
"primaryImageOfPage": {
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2024/08/sdim-collegas-jorn-celine-scaled.jpg",
"url": "https://www.sdim.nl/app/uploads/2024/08/sdim-collegas-jorn-celine-scaled.jpg",
"width": "2560",
"height": "1704",
"caption": "SDIM collega's Jorn en Céline",
"contentUrl": "https://www.sdim.nl/app/uploads/2024/08/sdim-collegas-jorn-celine-scaled.jpg"
},
"author": {
"@type": "Person",
"name": "Jesse Wieleman",
"url": "https://www.sdim.nl/team/jesse-wieleman/"
},
"keywords": "Data & automation",
"breadcrumb": {
"@type": "BreadcrumbList",
"@id": "https://www.sdim.nl/data-automation/#breadcrumb",
"itemListElement": [
{
"@type": "ListItem",
"position": "1",
"item": {
"@id": "https://www.sdim.nl",
"name": "SDIM"
}
},
{
"@type": "ListItem",
"position": "2",
"item": {
"@id": "https://www.sdim.nl/data-automation/",
"name": "Data & automation"
}
}
]
}
},
{
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2026/02/sdim-collega-kantoor-data-search-console.jpg",
"url": "https://www.sdim.nl/app/uploads/2026/02/sdim-collega-kantoor-data-search-console.jpg",
"width": "2000",
"height": "1333",
"contentUrl": "https://www.sdim.nl/app/uploads/2026/02/sdim-collega-kantoor-data-search-console.jpg"
}
]
}
/content-creatie/contentstrategie/
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "WebPage",
"@id": "https://www.sdim.nl/content-creatie/contentstrategie/#webpage",
"url": "https://www.sdim.nl/content-creatie/contentstrategie/#webpage",
"name": "SDIM’s aanpak voor een succesvolle contentstrategie",
"isPartOf": {
"@id": "https://www.sdim.nl/#website"
},
"inLanguage": "NL",
"datePublished": "2024-05-16T06:57:37+02:00",
"dateModified": "2026-03-31T11:28:41+02:00",
"primaryImageOfPage": {
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2026/02/sdim-collega-melissa-creatief-concept-whiteboard.jpg",
"url": "https://www.sdim.nl/app/uploads/2026/02/sdim-collega-melissa-creatief-concept-whiteboard.jpg",
"width": "2000",
"height": "1333",
"contentUrl": "https://www.sdim.nl/app/uploads/2026/02/sdim-collega-melissa-creatief-concept-whiteboard.jpg"
},
"author": {
"@type": "Person",
"name": "Melissa Perdaan-van Ketel",
"url": "https://www.sdim.nl/team/melissa-van-ketel/"
},
"keywords": "Contentstrategie,content strategie",
"breadcrumb": {
"@type": "BreadcrumbList",
"@id": "https://www.sdim.nl/content-creatie/contentstrategie/#breadcrumb",
"itemListElement": [
{
"@type": "ListItem",
"position": "1",
"item": {
"@id": "https://www.sdim.nl",
"name": "SDIM"
}
},
{
"@type": "ListItem",
"position": "2",
"item": {
"@id": "https://www.sdim.nl/content-creatie/",
"name": "Concept & creatie"
}
},
{
"@type": "ListItem",
"position": "3",
"item": {
"@id": "https://www.sdim.nl/content-creatie/contentstrategie/",
"name": "Contentstrategie"
}
}
]
}
},
{
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2023/06/content-icon.png",
"url": "https://www.sdim.nl/app/uploads/2023/06/content-icon.png",
"width": "500",
"height": "500",
"contentUrl": "https://www.sdim.nl/app/uploads/2023/06/content-icon.png"
},
{
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2024/09/contentstrategie.png",
"url": "https://www.sdim.nl/app/uploads/2024/09/contentstrategie.png",
"width": "791",
"height": "967",
"contentUrl": "https://www.sdim.nl/app/uploads/2024/09/contentstrategie.png"
},
{
"@type": "ImageObject",
"@id": "https://www.sdim.nl/app/uploads/2026/02/sdim-collega-noa-design-2.jpg",
"url": "https://www.sdim.nl/app/uploads/2026/02/sdim-collega-noa-design-2.jpg",
"width": "2000",
"height": "1333",
"contentUrl": "https://www.sdim.nl/app/uploads/2026/02/sdim-collega-noa-design-2.jpg"
}
]
}
🛡️ Trust Signals — external proof links that back the declared identity
310Review mentions (all pages)
12External proof links (all pages)
| Page | Reviews | Proof links |
|---|---|---|
| / (home) | 2 | 2 |
| /strategie/ | 102 | 2 |
| /digital-marketing/ | 2 | 2 |
| /content-creatie/ | 97 | 2 |
| /data-automation/ | 105 | 2 |
| /content-creatie/contentstrategie/ | 2 | 2 |
Explore the other reputation pillars for SDIM
Analysis Disclosure & Source Attribution
This page presents a snapshot of public data from SDIM, captured on May 20, 2026, to show how machine logic reads Identity & Authority signals into an AI reputation evaluation.
Purpose: This data is presented under “Fair Use” for the purpose of independent signal analysis, allowing readers to see the raw signals behind the reputation score.
Notice to SDIM: This analysis is part of a non-adversarial audit conducted by 1 Euro SEO. The results are intended as professional feedback to help improve any website’s machine-readability and authority signals. The evaluation is free, and any company can request a fresh audit at any time.
Any company can use the insights for free and improve its voice. When a company has updated its content, it can always submit a new audit request, which will be reflected in a new current score.
To all users: You are encouraged to visit the live site at https://www.sdim.nl to view the most current version of its content and see directly what this company is about and what it offers.