How to Extract Text from PDF

 How to Extract Text from PDF
How to Extract Text from PDF

How to Extract Text from PDF

Business processes often require you to extract text from PDF documents. PDFs are  tamper-proof, secure, and the most preferred format for exchanging data and information; but they are unfortunately not editable. If you opt to manually extract text or data from a PDF file to create a report or make a presentation, it could take a lot of time!

Most solutions that can efficiently extract text from PDFs today leverage OCR (Optical Character Recognition) capabilities. OCR technology can be used to identify & extract  text from images, PDFs & other non editable file formats. Depending on the scale and complexity of the PDF documents at hand, you might require varied levels of OCR capabilities.

Online PDF converters or PDF extraction tools can extract text from small PDF documents with simple formatting. But if you have a large quantity of documents with complicated formatting, tables, graphs and images, you will require an advanced OCR software like Nanonets to accurately extract relevant text from the PDFs.

Let’s look at the various ways in which you can use Nanonets to extract text from PDF documents easily, accurately and at scale:

How to extract text from PDF using Nanonets pre-trained OCR models
How to extract text from PDF by building a custom Nanonets OCR model
How to train custom models for a PDF to text converter using Nanonets API

Want to scrape data from PDF documents? Check out Nanonets PDF scraper to scrape PDF data at scale!

How to extract text from PDF using Nanonets pre-trained OCR models

The Nanonets pre-trained Receipt OCR model in action

If your PDFs fall under any of the following document types listed below, you can use the appropriate Nanonets pre-trained model to extract text instantly in a neat and organized manner:

  • Invoices
  • Receipts
  • Driver’s license (US)
  • Passports
  • Menu cards
  • Resumes
  • License plates
  • Meter readings
  • Shipping containers

Step 1 – Select a pre-trained model for your use case

Login to Nanonets and select a model that matches the document type from which you want to extract text. If none of the pre-trained OCR models describe your document, skip this method and read ahead to find out how to create a custom Nanonets OCR model.

Step 2 – Add files

Add the PDF files/documents from which you want to extract text. You can add as many PDFs as you like.

Step 3 – Test & verify

Allow a few seconds for the model to run and extract text from the PDF documents. A table view displays a list of all the text extracted from each PDF file. Quickly verify the extracted text to check whether anything was missed or incorrectly extracted. Click “Verify Data” to proceed.

Step 4 – Export

Once everything is verified, you can export all the extracted text as a neatly organized xml, xlsx or csv file.

Need a free online OCR to extract text from image or extract data from PDF? Check out Nanonets and build custom OCR models for free!

How to extract text from PDF by building a custom Nanonets OCR model

Building a custom Nanonets OCR model to extract text from PDFs is pretty straightforward. You can typically build, train and deploy a model for any document type, in any language, all in under 25 minutes (depending on the number of files used to train the model).

Building a custom Nanonets OCR model

Step 1: Create a custom OCR model

Login to Nanonets and click on “Create your own OCR model”.

Step 2: Upload training files

Upload sample PDF files. These will serve as a training set for the OCR model on how to extract text according to your requirements. The accuracy of the OCR model you build will greatly depend on the quality and quantity of the uploaded PDF files.

Step 3: Annotate text on the PDFs

Annotate each piece of text with an appropriate field or label. This will teach the OCR model to identify relevant portions of text in the PDF. You can also add a new label to annotate text. Nanonets is not bound by the template of the document!

Step 4: Train the custom OCR model

Once the annotation is complete, click on “Train Model”. Training usually takes between 20 mins-2 hours depending on the number of models & files queued for training. You can upgrade to a paid plan to get faster results (under 20 minutes). Nanonets leverages deep learning to build various OCR models and tests them against each other for accuracy. Nanonets then picks out the most accurate OCR model.

The “Model Metrics” tab shows the various measurements and comparative analyses that allowed Nanonets to pick the best OCR model among all that were built. You can retrain the model (by providing a wider range of training images and better annotation) to achieve higher levels of accuracy.

Or, if you’re satisfied, click on “Test” to test & verify the custom OCR model on a fresh sample of PDFs.

Step 5: Test & verify data

Add a couple of sample images to test & verify the custom OCR model. If the text has been recognized, extracted and presented appropriately then export the file.

Nanonets online OCR & OCR API have many interesting use cases that could optimize your business performance, save costs and boost growth. Find out how Nanonets’ use cases can apply to your product.

How to train custom models for a PDF to text converter using Nanonets API

If you’re looking to train your own OCR models to build a PDF to text converter, check out the Nanonets API. In the documentation, you will find ready to fire code samples in Shell, Ruby, Golang, Java, C# and Python, as well as detailed API specs for different endpoints.

Does your business deal with text recognition in digital documents, images or PDFs? Have you wondered how to extract text from images accurately?

Start using Nanonets for Automation

Try out the model or request a demo today!


How to Extract Text from PDF



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