Security and output
How to redact PDF content in C#
Mark exact extracted-text matches or explicit regions, remove matched text from supported page content, and save a rewritten output file.
Guides
ZingPDF guides
Task-based articles for common PDF operations in C#, including the fluent authoring API for new documents.
Current Guides
Document creation
How to create PDFs with the fluent authoring API in C#
Use Pdf.New() to author pages with text, shapes, images, boxed layout, wrapping, and saved output.
Document creation
How to create a PDF from a Liquid HTML template in C#
Render a Liquid template with a .NET model, inspect the HTML if needed, and convert it to PDF through the template package.
Document creation
How to create a blank PDF in C#
Start a new PDF, choose the page size up front, add more pages if needed, and save the result.
Page structure
How to insert, append, and delete PDF pages in C#
Add pages to the end, insert them at a specific position, remove existing pages, and keep the order straight.
Page structure
How to export selected pages or split a PDF in C#
Copy only the pages you want into a new PDF, keep the requested page order, or break a larger document into smaller files.
Page structure
How to export selected PDF pages in C#
Copy a known set of pages into a new PDF and preserve the output order you asked for.
Page structure
How to append a page to a PDF in C#
Add a page to the end of the document, set the size up front, and use the returned page for new content.
Page structure
How to delete PDF pages in C#
Remove one or more pages by 1-based number and save the updated document.
Page content
How to add text to a PDF page in C#
Write text into a page rectangle, choose font settings, and decide what should happen when the text does not fit.
Fonts and text
How to use standard PDF fonts in C#
Register built-in PDF fonts such as Helvetica, Times, and Courier and use them for page text.
Fonts and text
How to embed a TrueType font in a PDF in C#
Register a font from disk or a stream and use it when the output needs a specific typeface.
Fonts and text
How to use Google Fonts in a PDF in C#
Download a Google Fonts family, register it into the document, and use it like any other embedded font.
Security and output
How to remove a password from a PDF in C# without leaving old encrypted revisions behind
Save a plain copy from an encrypted PDF, and decide whether you also need to remove older encrypted revision history from the file.
Forms and data capture
How to fill PDF form fields in C#
Fill AcroForm fields by name, discover fields in unfamiliar files, and select choice options without looping through every option yourself.
Forms and data capture
How to flatten a PDF form in C#
Turn the current form appearance into normal page content when the completed output should stop behaving like a form.
Document assembly
How to merge PDFs in C#
Append pages from one or more PDF streams, control the final page order, and save the combined output.
Page content
How to add watermarks to PDFs in C#
Add a text watermark to one page or the whole document, then save or combine it with other document updates.
Security and output
How to encrypt a PDF with AES in C#
Write AES-128 or AES-256 protected output, choose user and owner passwords, and save the encrypted file.
Security and output
How to restrict PDF permissions in C#
Allow or block printing, copying, editing, annotation, and form filling when writing encrypted output.
Forms and data capture
How to sign a PDF form field in C#
Sign an existing signature field, or add a hidden validation-only field and sign that with an X509 certificate.
Text and content
How to extract text from a PDF in C#
Read text from the whole document or a single page, and choose between extracted segments and plain text output.
Text and content
How to extract text from a scanned PDF in C#
Use OCR on scanned or image-based pages with Tesseract and the ZingPDF OCR package.
Document info
How to update PDF metadata in C#
Set title, author, subject, keywords, creator, and creation date through the high-level metadata wrapper.
Page structure
How to rotate PDF pages in C#
Rotate one page or the whole document with the built-in rotation helpers and save the updated file.
Output and size
How to compress a PDF in C#
Recompress eligible streams, tune JPEG quality, and save a smaller output file from the high-level API.
Output and save
How to rewrite a PDF without incremental history in C#
Remove the previous incremental revision chain before saving when the output should only reflect the current document state.
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