Inline PDF Labeling in Label Studio Enterprise for OCR

Label Studio Enterprise delivers a native PDF experience for OCR review. Open a file in a modern viewer, move quickly through long documents, draw regions on the text that needs correction, and capture the text that proves it, all in one place with zoom and rotation. Three outcomes make this work: precision, proof and convenience.

Precision: capture the details that drive the call

Decisions hinge on specifics. A signature on page 7. A clause that changes terms. A total that must reconcile. With OcrLabels, reviewers can draw bounding boxes on the page and add or edit the text tied to that region. If the PDF includes a text layer, the relevant text auto-populates the new OCR box. This means corrections can happen in one place and exactly where the errors live.

Proof: show exactly what was verified

Audits and governance require verifiable records. Each region label stores the page number and coordinates, the captured or edited text, and reviewer timestamps in the action log. Exports and APIs return these as structured JSON, so downstream systems can use both the decision and its page-level context. See examples here. 

Convenience: keep reviewers in flow

Throughput starts with fewer interruptions. Reviewers can zoom, rotate, and advance through long PDFs in the same place, without extra windows. For documents up to 100 pages, the viewer keeps page context and labels together so corrections stay anchored to the right spot.

PDF features available in Label Studio Enterprise

• OCR correction with OcrLabels (draw region, capture/edit text)
• Auto-populate OCR boxes when a text layer is present
• Native PDF viewer with zoom and rotation
• Responsive navigation across long documents (supports PDFs up to 100 pages)
• Modern rendering powered by PDF.js for fidelity and interaction

Common enterprise workflows

• Fix scanned OCR at the source. Select the region, capture the intended content, and keep the correction tied to the exact spot on the page.
• Classify sub-elements that drive policy. Mark signatures, seals, stamps, clauses, line items, and totals that determine the decision.
• Label the fields that matter. Turn unstructured pages into reliable records with region-anchored text and labels.

Get started on your documents

Use the OCR Correction template to capture page-anchored text in one pass. Open a PDF, draw OcrLabels, confirm or fix the text, and export structured records with page, coordinates, and final text.

Try the template | Request a Demo