[Online Searchable Document App and PDF Text Search API Code Develop powerful .NET based PDF document search engine software or utility app. Test online document text finder app for free. Download How to Search in PDF via Online App Upload PDF file to search by clicking inside the drop area or via drag and drop. Enter the search criteria by specifying the parameters. Click the “SEARCH” button to search PDF. Download the searched PDF to view instantly. How to Search PDF File via C# Install ‘Aspose.PDF for .NET’. Add a library reference (import the library) to your C# project. Open the source PDF file using Document class. Define the search criteria in Regex. Create TextAbsorber object to find all instances of the input regex. Accept the absorber for the page. Get the extracted text fragments. Loop through the fragments to get the output. Code example in C# to Search Text in PDF Files PDF (Portable Document Format) files are widely used for sharing finalized documents that preserve layout and formatting across platforms. The search feature in PDF viewers enables users to quickly locate text, annotations, and form fields without altering the original content. In professional, academic, and legal environments, the ability to search PDFs is critical for reviewing contracts, manuals, research papers, and reports efficiently. Use Cases Finding specific clauses, dates, or terms in scanned or digital contracts and agreements. Locating references or citations in academic research papers and theses. Searching technical manuals or user guides for troubleshooting instructions. Reviewing annotations or comments added during collaborative document reviews. Extracting key data points from financial reports or audit documents. Navigating large eBooks or whitepapers to jump to chapters or topics of interest. Verifying compliance terms or legal language in regulatory filings. Searching form fields and interactive elements in fillable PDFs for data validation. Develop PDF File Search Engine via .NET Need to develop a PDF searchable software or utility? With Aspose.PDF for .NET a child API of Aspose.Total for .NET, any developer can integrate the above API C# code to program text search across documents. Powerful C# library allows programming document search software solution that can support many popular formats including PDF format. C# library to Search PDF File There are three alternative options to install “Aspose.PDF for .NET” or “Aspose.Total for .NET” onto your system. Please choose one that resembles your needs and follow the step-by-step instructions: Install a NuGet Package . See Documentation Install the library using Package Manager Console within Visual Studio IDE System Requirements Our product is fully cross-platform and supports all major .NET implementations following ‘.NET Standard 2.0’ specification: Microsoft .NET Framework, starting from the earliest 2.0 version, and ending with the latest ‘.NET Framework 4.8’ .NET Core, starting from the earliest 2.0, and ending with the latest ‘.NET 6’ Mono >= 2.6.7 As .NET code doesn’t rely on the underlying hardware or operating system, but only on a Virtual Machine, so you are free to develop any kind of software for Windows, macOS, Android, iOS and Linux. Just make sure you have installed the corresponding version of .NET Framework, .NET Core, Windows Azure, Mono or Xamarin. We recommend using Microsoft Visual Studio, Xamarin, and MonoDevelop IDE to create C#, F#, VB.NET applications. Fore more details please refer to Product Documentation . FAQs Can I use above C# code in my application? Yes, You may download this code or copy it to use it for the development of any files text extraction and retrieval .NET based application. Is this document searchable App work only on Windows? One can search from any device, regardless of the operating system either it is Windows, Linux, Mac OS and Android, that has a modern browser and an internet connection. Is it safe to use the online app PDF Document Search? Of course! Output files will be deleted from our servers after 24 hours and download links will stop working. What browser should to use App? You can use any modern web browser, such as Google Chrome, Firefox, Opera, or Safari, for the online PDF document search. However, if you are developing a desktop application, the Aspose.Total Document Search API is recommended for smooth and efficient processing. Explore File Search Options with .NET Search in DOC (Microsoft Word Binary Format) Search in DOCX (Office 2007+ Word Document) Search in Excel Search in ODP (OpenDocument Presentation Format) Search in ODS (OpenDocument Spreadsheet) Search in ODT (OpenDocument Text File Format) Search in PDF (Portable Document Format) Search in PowerPoint Search in PPT (PowerPoint Presentation) Search in PPTX (Open XML presentation Format) Search in Word Search in XLS (Microsoft Excel Binary Format) Search in XLSX (Open XML Workbook) ]