Universal workbench

PNM / Netpbm OCR to OCR JSON

Recognize text in PNM / Netpbm and create OCR JSON locally with a pinned Tesseract engine.

Device-onlyNo uploads. Ever.

Pipelines, branches, presets, naming, and detailed controls

Display

Text sizeDensity High contrast Monospace editor

Quick start

JSON → YAML WebP → PNG SVG → React JSX Plain text → Base64

From

Help me choose the best output Suggested: PDF

What matters most?

Recommendations use the registered target format and tested fidelity classification. They never inspect or upload your content.

01Input

Drop files or a folder hereChoose PNM / Netpbm files or a folder — batch input is welcome

Choose files Choose folder

or paste content

02Configure & run

PNM / NetpbmOCR JSON

structural conversion · single or batch

Conversion preflightSize, memory, engine, execution, and fidelity before you start

Input: 0 B
Estimated peak memory: 256 MiB
On-demand download: Up to 78 MiB on first use
Execution: Responsive local worker
Fidelity: No lossy step declared

What to provideDrop one or more PNM / Netpbm files; this format cannot be pasted as plain text.What you’ll getProduces OCR JSON containing recognized text, confidence, layout blocks, lines, words, and bounding boxes.

Useful presetsTransparent, editable settings—not opaque quality labels

OCR languageThe selected pinned Tesseract language pack downloads on first use and is then cached by the browser. Lithuanian is fully supported.Page layoutAutomatic works for most pages. Single block and sparse text can improve specialized layouts.PDF render scaleHigher values can improve small-print OCR but use more memory. This option applies only to PDF input.2

Output naming & batch behavior

Filename templateAvailable variables: {output} (converter’s meaningful name), {name}, {target}, {ext}, {index}. Duplicate names receive a safe numeric suffix.

Exampleoutput.ocr.json

Pipeline 1 linear · 0 branches

Why use A → B → C?

A pipeline feeds each result directly into the next compatible converter. Use one when the destination needs an intermediate representation or when you want to inspect and normalize that middle format.

JSON → CSV → XLSX turns records into rows before building a workbook.
Markdown → HTML → DOCX resolves markup before creating a document.
SVG → PNG → PDF intentionally flattens vector artwork before placing it on a page.

Only type-compatible next steps are offered. Lossy steps are marked before you run them.

1PNM / Netpbm OCR to OCR JSONstructural

Add content above to start. Nothing leaves this browser.

Processing happens locally. Your file bytes are never sent anywhere.

About this conversion

How to convert PNM / Netpbm to OCR JSON

Before you start

Drop one or more PNM / Netpbm files; this format cannot be pasted as plain text.

Accepted: .pnm, .ppm, .pgm, .pbm · image/x-portable-anymap

Choose or drag one or more PNM / Netpbm files onto the drop zone.
Confirm the detected format and adjust the available settings. Mixed-format batches are flagged before conversion.
Select “Convert on this device.” Produces OCR JSON containing recognized text, confidence, layout blocks, lines, words, and bounding boxes.

How this converter behaves

Pinned OCR or speech-recognition models run locally after an explicit engine download. Recognized text, timing, and confidence data remain in this browser tab.

What happens to your data?

The conversion engine runs in this browser tab. OmniCastConverter has no upload API and never sends your content, file name, or converted result to a server.

Fidelity and limitations

This route is classified as structural. The converter preserves meaning and structure supported by both formats.

OCR accuracy depends on scan resolution, contrast, orientation, language selection, typography, and page complexity.