How to Run Structured OCR on a PDF Online — Free, Layout Preserved

Plain OCR turns a scanned report into a wall of text — usable for search but not for feeding to a data pipeline that needs to know what's a heading vs. what's a footnote. Structured OCR preserves layout, so downstream code can sort by section, extract just the tables, or skip the boilerplate.

When you actually need Structured OCR

Document automation pipelines, archive systems that need structured metadata, building datasets from scanned papers, extracting tables from financial reports.

How to structured ocr, step by step

Open the tool

Go to convertpdfgo.com/ocr-structured. No account, no email, no installation.

Drop the file in

Drag the file onto the upload area or click to pick. Files up to 30 MB go through without a queue. Encrypted in transit (TLS 1.3), encrypted at rest, deleted within one hour.

Configure

Pick the OCR language; output is structured JSON with bounding boxes for headings, paragraphs, columns, tables.

Download

Open in any reader, paste anywhere, feed to scripts.

Common problems and how to avoid them

Headings classified wrong

Tesseract uses font size + bold for heading detection. Unusual layouts (all-bold body text) fool it. Manual cleanup needed.

Columns merged into one

The columns are too close together for Tesseract to split. Pre-process: crop columns out separately, then OCR each.

Tables come out as text

Table mode helps but is not foolproof — borderless tables fool it more than bordered. Try PDF to Excel for known-table PDFs.

A short word on privacy

Three things to know. One: files go over TLS 1.3. Two: files are encrypted at rest while we process them, then deleted automatically within one hour. Three: we don't look at your files or train on them.

How we compare to other free tools

Feature	convertpdfgo	Smallpdf	iLovePDF
Sign-up	None	After 2/day	Optional
Watermark	None	None	None
Auto-delete	1 hour	Vague	2 hours

Frequently asked questions

How is this different from regular OCR?

Regular OCR returns flat text. Structured OCR returns text plus layout: 'this is a heading', 'this is a column', 'this is a table row'. Better for downstream automation.

Can it detect tables?

Yes — Tesseract's table mode identifies row and column boundaries from the spacing between cells.

Are my files private?

Files are encrypted in transit (TLS 1.3) and at rest, then auto-deleted within one hour.

Will it work on protected PDFs?

Not directly — unlock the PDF first with our Unlock PDF tool if you know the password.

Is there a usage limit?

No. Free, no daily cap, no sign-up wall, no watermark.

How long does it take?

About 5-30 seconds depending on file size and OCR complexity. Multi-page scans take longer.

What's the file size limit?

30 MB as a guest, 50 MB when signed in.

What to do next

Now you can OCR PDF, PDF to Excel, or Inspect PDF. All free.

Or browse our full list of 49 free PDF tools.