Kraken

At a glance

• Editor score
  6.0 / 10
• Pricing
  Free plan
• Best for
  Trainable OCR for historical scripts
• Free plan
  Yes
• Paid from
  Free
• Facts checked
  23 Sep 2026

• Where it wins

  • Trainable layout, reading-order, segmentation, and character models
  • Supports handwriting and right-to-left, bidirectional, and vertical scripts
  • Exports ALTO, PageXML, AbbyyXML, and hOCR with detailed recognition data

• Where it doesn't

  • Requires technical workflows through command-line or Python interfaces
  • Focused on specialist OCR rather than general end-user document workflows
  • Runs locally on Linux and macOS rather than across a broad platform range

Our verdict on Kraken

Kraken is an open-source OCR and automatic text recognition system for historical documents, handwriting, and non-Latin scripts. It is suited to digital-humanities specialists, archivists, researchers, and developers who need to adapt recognition and layout models to particular materials. Kraken can process images and PDFs locally on Linux and macOS, with command-line and Python API interfaces for building repeatable workflows.

Its main strength is trainability. The software supports trainable layout analysis, reading-order detection, segmentation, and character recognition, including model training and fine-tuning for specific scripts or handwriting. Support for right-to-left, bidirectional, and top-to-bottom writing makes it suitable for documents that require more than standard left-to-right recognition. Output options include ALTO, PageXML, AbbyyXML, and hOCR, while word bounding boxes and character cuts provide structured results for archival and research workflows.

Kraken also fits established humanities-oriented ecosystems through integrations with eScriptorium, OCR4all, OCR-D, and Arkindex. Command-line workflows can be chained, and the Python API covers preprocessing, segmentation, recognition, and serialization. The trade-off is a specialist orientation: users looking for a simple, general-purpose desktop OCR workflow may find the command-line and programming interfaces less approachable. Kraken is a strong choice when trainable models, historical materials, complex writing directions, or archival output formats matter; a more general end-user OCR tool may be a better fit for routine document conversion.

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Kraken pricing

Kraken fact sheet

Kraken integrations

Kraken lists 4 integrations on its own site.

• eScriptorium
• OCR4all
• OCR-D suite
• arkindex by Teklia

Alternatives to Kraken

• PPaddleOCRA developer-focused OCR toolkit with multilingual, handwriting, and document parsing workflows.9.3
• TOTesseract OCRA mature, developer-focused OCR engine with broad outputs and self-hosting flexibility.9.1
• ABBYY FineReader PDFA broad desktop PDF suite for OCR, editing, conversion, forms, and document control.9.0

See all Kraken alternatives →

Featured on iTechGuides

Kraken is listed in our OCR Software directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update