As a programmer, often you have to extract content from PDF files as plain text for further processing, such as analysis and information extraction. Processing PDF files and converting a whole PDF into TXT format is a troublesome task when you don’t have the right tools. So in this blog, we will explore how to convert a PDF file to TXT format programmatically in C#.
C# Library for PDF to TXT Conversion
[Aspose.Words for .NET][1] is an amazing document processing API that allows developers to work with Word documents, as well as various other formats, including PDF. With its extensive set of features, Aspose.Words simplifies document manipulation, conversion, and generation tasks. We will utilize this library to convert PDF files to TXT format in a .NET application.
You can install the library from [NuGet][5] using the following command. Or download its DLL from the [Releases][6] section.
Convert a PDF to TXT in C#
Aspose.Words for .NET hides all the complex operations of extracting text from PDF files and enables you to perform PDF to TXT conversion in a couple of steps, as mentioned below.
- Load the PDF file.
- Convert PDF to TXT format with a single function call.
Thus, with a couple of lines of code, you can convert content in a PDF file to plain text, no matter how large the source PDF is. Let’s now write the code to perform this conversion in C#.
- First, load the PDF using the Document class.
- Then, save the document as a TXT file using Document.Save(filePath) method.
The following C# code snippet converts a PDF to TXT format.
Get a Free API License
You can get a [free temporary license][2] to convert PDF files to TXT format without evaluation limitations.
Conclusion
In this blog post, we explored how to convert PDF to TXT in C# using the Aspose.Words for .NET library. Following the guidelines and using the code snippet, you can easily process large PDF files and convert them to plain text. Aspose.Words simplifies document processing tasks, making it a valuable tool for developers working with various document formats in their applications. You can visit the [documentation][3] of this .NET word processing library to explore its amazing features. In case you would have any questions, feel free to let us know via our [forum][4].
Advanced Extraction Options
When you need more control over the text extraction process, Aspose.PDF for .NET offers several advanced features. You can extract text from specific pages, preserve the original layout, or filter out unwanted elements such as headers, footers, or annotations.
Extracting Specific Pages
If you only need the content of certain pages, use the TextAbsorber together with a PageNumber collection. The following snippet demonstrates how to pull text from pages 2 through 5:
Preserving Layout
Sometimes plain text loses the visual structure of tables or columns. By setting the ExtractTextOptions property, you can keep line breaks and spacing that mimic the original layout:
Handling Large PDFs and Performance Tips
Processing multi‑hundred‑page PDFs can be memory‑intensive. Below are proven strategies to keep the conversion fast and reliable.
Stream‑Based Processing
Instead of loading the entire file into memory, open the PDF as a stream. This reduces the memory footprint, especially on 32‑bit processes.
Incremental Saving
If you need to split a massive PDF into several TXT files, process each page or a small batch, write the result to disk, and then release the page objects. This prevents the Document object from holding onto all pages simultaneously.
Parallel Extraction (Advanced)
For CPU‑bound workloads, you can parallelize page extraction using Parallel.For. Ensure thread‑safety by creating a separate Document instance per thread or by cloning the page objects.
By applying these techniques, developers can efficiently convert even the largest PDFs to plain text without running into out‑of‑memory errors or excessive processing times.
