Find and Replace Text in PDF using C#

Wordize provides C# developers with powerful high-level tools for programmatic modification of PDF documents. By integrating search and replace capabilities into their .NET projects, developers can create robust solutions for comprehensive PDF document updates.

Find and Replace in PDF - Key Features

RegEx support for efficient processing of varying text combinations and complex data patterns.
Support for special characters and formatting elements to correctly handle paragraph breaks, section breaks, page breaks, and other structural elements of PDF documents.
Comprehensive search throughout the entire document hierarchy, including headers, footers, and tables.
Flexible settings to exclude specific content elements during bulk text replacement.

Practical Use Cases

Automated PDF template processing. Fast and error-free bulk population of PDF files by replacing placeholders with dynamic content from databases, CRM systems, or user input.
Content updates in PDF documentation. Efficiently update product information, technical specifications, price lists, calendar dates, and contact details across multiple documents.
Format unification and standardization. Use regular expressions to detect and correct inconsistent formatting, outdated terminology, and styling to maintain corporate standards compliance.
Document preparation before publication. Automatically remove confidential information, add necessary metadata, and ensure documents comply with official publication requirements.
Document workflow automation. Integrate programmatic search and replace functions into your existing business processes to create comprehensive document management solutions.

Our interactive online demo with C# code examples helps you explore the possibilities of programmatic text search and replacement in PDF documents. To try it, upload any PDF file, specify the required search/replace strings, click the process button, and then download the modified PDF file for verification.

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Select the target format from the list

 
				
				
		
using Wordize.Replacing;

Replacer.Replace("Input.pdf", "Output.pdf", "Text or RegEx", "Text or RegEx");
										using Wordize.Replacing;

Replacer.Replace("Input.pdf", "Output.pdf", "Text or RegEx", "Text or RegEx");
										using Wordize.Replacing;
using Wordize.Saving;

var imageStreams = Replacer.ReplaceToImages("Input.pdf", 
    new ImageSaveOptions(SaveFormat.Pdf), "Text or RegEx", "Text or RegEx");

foreach (var (stream, page) in imageStreams.Select((s, i) => (s, i)))
{
    using var _ = stream;
    stream.Position = 0;
    
    using var file = File.Create($"Output_{page + 1}.pdf");
    stream.CopyTo(file);
}
					
using Wordize.Replacing;

FindReplaceOptions options = new FindReplaceOptions() { UseSubstitutions = true };
Replacer.Replace("Input.pdf", "Output.pdf", new Regex(@"Text or RegEx"), "Text or RegEx", options);
										using Wordize.Replacing;

FindReplaceOptions options = new FindReplaceOptions() { UseSubstitutions = true };
Replacer.Replace("Input.pdf", "Output.pdf", new Regex(@"Text or RegEx"), "Text or RegEx", options);
										using Wordize.Replacing;
using Wordize.Saving;

FindReplaceOptions options = new FindReplaceOptions() { UseSubstitutions = true };
var imageStreams = Replacer.ReplaceToImages("Input.pdf", 
    new ImageSaveOptions(SaveFormat.Pdf), new Regex(@"Text or RegEx"), "Text or RegEx", options);

foreach (var (stream, page) in imageStreams.Select((s, i) => (s, i)))
{
    using var _ = stream;
    stream.Position = 0;
    
    using var file = File.Create($"Output_{page + 1}.pdf");
    stream.CopyTo(file);
}
					

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How to replace text in PDF with C#

Install Wordize for .NET
Add a reference to the library in your C# project
Set search and replace parameters for text in your PDF document