Marker vs 
Unstructured
Marker vs Unstructured compared for 2026 — features, license, ease of use, performance and which one to choose. Convert PDFs to clean Markdown fast vs Turn any file into LLM-ready data.
Updated regularly · curated by OpenSourceAI.tech
Marker vs Unstructured at a glance
| Spec | Marker | Unstructured |
|---|---|---|
| Category | Document AI & OCR | Document AI & OCR |
| Type | PDF-to-Markdown converter | ETL for documents |
| License | GPL-3.0 | Apache-2.0 |
| Runs locally | Yes | Self-hosted |
| Primary language | Python | Python |
| Ease of use | Intermediate | Intermediate |
| Best for | developers feeding documents into RAG pipelines | teams ingesting many file types into one pipeline |
| GitHub stars | — | 15.1k |
How Marker and Unstructured score
| Criterion | Marker | Unstructured |
|---|---|---|
| Popularity | n/a | 3.5 |
| Maintenance | n/a | 5.0 |
| Ease of use | 3.5 | 3.5 |
| Privacy | 5.0 | 4.5 |
| License freedom | 3.5 | 5.0 |
Scores are computed automatically from public signals — GitHub stars (popularity), recent commit activity (maintenance), license type (freedom), local-first design (privacy) and onboarding complexity (ease of use). Indicative, not a verdict.
What each one is
Marker
Marker converts PDFs and office documents to clean Markdown, JSON and HTML with high accuracy, handling tables, equations and multi-column layouts.
- High-accuracy PDF to Markdown, tables included
- Handles equations and complex layouts
- Fast batch conversion on GPU or CPU
Unstructured
Unstructured extracts and normalizes content from PDFs, HTML, Word, emails and more into clean elements ready for embedding and RAG ingestion.
- One API for dozens of file formats
- Chunking strategies designed for RAG
- Widely adopted in the LLM data stack
Key differences
Marker is pDF-to-Markdown converter, while Unstructured is eTL for documents. Their licenses differ (GPL-3.0 vs Apache-2.0), which matters if you ship a commercial product. They also differ in how they run (Yes vs Self-hosted). In short, Marker fits developers feeding documents into RAG pipelines, and Unstructured fits teams ingesting many file types into one pipeline.
Which should you choose?
Choose Marker for developers feeding documents into RAG pipelines. Choose Unstructured for teams ingesting many file types into one pipeline.
There is rarely one winner — many setups use both. The right pick depends on your hardware, your team's skills, and whether you value simplicity or control.
Frequently asked questions
Is Marker or Unstructured easier to use?
Both sit at a similar level (Intermediate). Your choice should come down to fit rather than difficulty.
Are Marker and Unstructured free?
Marker is free and open source (GPL-3.0), and Unstructured is free and open source (Apache-2.0). Neither charges for the core software.
Can I run Marker and Unstructured locally?
Marker: yes · Unstructured: self-hosted. Both can be used without sending your data to a third-party cloud where their setup allows.
Marker vs Unstructured — which should I pick in 2026?
Choose Marker for developers feeding documents into RAG pipelines. Choose Unstructured for teams ingesting many file types into one pipeline.
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