Image to PDF / .NET Reference

Constructor for the PDFCrowd API client. Initialize a new instance of the conversion client with your PDFCrowd account credentials.

You must provide both your username and API key. This establishes the authenticated connection for all subsequent conversion operations.

Convert an image from a URL.

Use this as the primary method for converting web content, online documents, or any publicly accessible URL to the desired output format. Returns the conversion result as a byte array for further processing or direct use.

Convert an image from a URL and write the conversion result directly to an output stream.

Use this when you need to handle large conversion results, integrate with streaming pipelines, or build server applications that process conversions continuously.

Convert an image from a URL and save the conversion result directly to a local file.

Use this for simple file-based workflows, batch processing, or when you need to persist conversion output to disk. The most straightforward method for URL-to-file conversions.

Convert a local file to the desired output format.

Use this for processing files already on your system, converting uploaded documents, or batch processing local content. Returns the conversion result as a byte array for in-memory processing.

Convert a local file and write the conversion result directly to an output stream.

Use this when working with large conversion results, integrating with streaming frameworks, or building applications that need direct stream-to-stream processing.

Convert a local file and save the conversion result to another local file.

Use this for file-based batch processing, document transformation workflows, or when both input and output are file-based. The simplest method for file-to-file conversions.

Convert raw binary data to the desired output format.

Use this for processing binary content, handling file uploads as byte arrays, or when working with data from external APIs. Provides maximum flexibility for binary data conversions.

Convert raw binary data and write the conversion result directly to an output stream.

Use this when handling large binary data with substantial conversion results, integrating with streaming systems, or building high-performance conversion services.

Convert raw binary data and save the conversion result to a local file.

Use this for processing binary uploads and persisting the output, handling data from external sources, or when working with byte array inputs that need file-based storage.

Convert content from an input stream to the desired output format.

Use this when integrating with I/O pipelines, processing data from network streams or file handles, or when the source data is provided as a stream by your application.

Convert content from an input stream and write the conversion result to an output stream.

Use this when both input and output need to be streams, integrating with streaming frameworks, or building conversion services that process data in stream form throughout.

Convert content from an input stream and save the conversion result to a local file.

Use this when processing streaming uploads that need to be saved, handling network data sources with file-based output, or building services that accept stream input and produce file output.

Scale the image to different dimensions. Accepts percentage values for proportional scaling or explicit pixel dimensions for absolute sizing.

Rotate the image by the specified angle in degrees. Positive values rotate clockwise, negative values counterclockwise.

Set the horizontal starting position of the crop area, measured from the left edge of the print area. Positive values offset inward from the left edge, negative values extend beyond the left boundary.

Set the vertical starting position of the crop area, measured from the top edge of the print area. Positive values offset inward from the top edge, negative values extend beyond the top boundary.

Set the horizontal extent of the crop area. Defines the width of the region to be converted. Minimum value is 1 inch.

Set the vertical extent of the crop area. Defines the height of the region to be converted. Minimum value is 1 inch.

Define a rectangular region to convert by setting X/Y position and width/height simultaneously. Coordinates are relative to the print area's top-left corner.

Detect and remove solid-color borders surrounding the image content. Only removes borders that consist of a single consistent color.

Set the output page size. Use standard sizes (A4, Letter, A3, etc.) for printable output with consistent dimensions.

Set the output page width.

Set the output page height.

Set the output page dimensions. If no page size is specified, margins are applied as a border around the image.

Set the output page orientation. Use portrait for standard documents, landscape for wide content like tables.

Set the image position on the page. Center for balanced layout, or corner/edge positions for specific design needs.

Set the mode to print the image on the content area of the page.

Set the output page top margin.

Set the output page right margin.

Set the output page bottom margin.

Set the output page left margin.

Set the output page margins. Control white space for readability, binding clearance, or print requirements.

The page background color in RGB or RGBA hexadecimal format. The color fills the entire page regardless of the margins. If no page size is specified and the image format supports background (e.g. PDF, PNG), the background color is applied too.

Set the DPI resolution of the input image. The DPI affects margin options specified in points too (e.g. 1 point is equal to 1 pixel in 96 DPI).

Apply the first page of a watermark PDF to every page of the output PDF. Use this to add transparent overlays like "DRAFT" stamps, security markings, or branding elements that appear on top of content. Ideal for confidential document marking or adding protective overlays.

Load a file from the specified URL and apply the file as a watermark to each page of the output PDF. A watermark can be either a PDF or an image. If a multi-page file (PDF or TIFF) is used, the first page is used as the watermark.

Apply each page of a watermark PDF to the corresponding page of the output PDF. Use this for page-specific watermarks where different pages need different overlays - for example, different approval stamps per department.

If the watermark has fewer pages than the output, the last watermark page is repeated for remaining pages.

Load a file from the specified URL and apply each page of the file as a watermark to the corresponding page of the output PDF. A watermark can be either a PDF or an image.

Apply the first page of a background PDF to every page of the output PDF. Use this to add letterheads, branded templates, or decorative backgrounds that appear behind your content. Backgrounds appear beneath content, while watermarks layer on top.

Perfect for adding company letterheads to reports or applying branded templates to dynamically generated content.

Load a file from the specified URL and apply the file as a background to each page of the output PDF. A background can be either a PDF or an image. If a multi-page file (PDF or TIFF) is used, the first page is used as the background.

Apply each page of a background PDF to the corresponding page of the output PDF. Use this for page-specific backgrounds where each page needs a different template - for example, different letterheads for front and back pages.

If the background has fewer pages than the output, the last background page is repeated for remaining pages.

Load a file from the specified URL and apply each page of the file as a background to the corresponding page of the output PDF. A background can be either a PDF or an image.

Create linearized PDF. This is also known as Fast Web View. Use this to optimize PDFs for progressive download, allowing users to start viewing the first page while the rest downloads.

Encrypt the PDF to prevent search engines from indexing the contents and add an extra layer of security. Use this for confidential documents, internal reports, or any content you do not want appearing in search results.

Combine with a password to require authentication for viewing, or just use encryption alone to prevent indexing while keeping the PDF publicly readable.

Protect the PDF with a user password to restrict who can open and view the document. Recipients must enter this password to view the PDF. Use this for confidential documents, sensitive data, or content distribution where you want to control access.

Combine with permission flags to restrict what users can do after opening.

Protect the PDF with an owner password for administrative control. This password allows changing permissions, passwords, and document restrictions - like a master key. Use different user and owner passwords to give recipients restricted access while retaining full control.

The owner password should be kept confidential and different from the user password.

Disallow printing of the output PDF to protect sensitive content. Use this for confidential documents, copyrighted materials, or preview versions you want to restrict.

Disallow modification of the output PDF to maintain document integrity. Use this for official documents, contracts, or records that should not be altered after creation. Prevents recipients from editing content, adding annotations, or extracting pages.

Disallow text and graphics extraction from the output PDF to protect copyrighted content. Use this for ebooks, proprietary documents, or materials where you want to prevent easy copying and redistribution.

Set the title of the PDF that appears in PDF reader title bars and document properties. Use descriptive titles for better organization and searchability in document management systems.

This metadata helps users identify documents when multiple PDFs are open and improves accessibility for screen readers.

Set the subject of the PDF to categorize or summarize the document content. Use this to add searchable metadata for document management systems, improve organization in large PDF libraries, or provide context about the document's purpose.

Appears in PDF properties dialog.

Set the author of the PDF for attribution and document tracking. Use this to identify who created the document, important for official documents, reports, or publications.

This metadata appears in PDF properties and helps with document management and version control.

Associate keywords with the document to improve searchability in document management systems. Use relevant terms that describe the content, making it easier to find documents later.

Separate multiple keywords with commas. Particularly useful for large document repositories or DAM systems.

Control how pages appear when the PDF opens in viewers that respect these preferences. "single-page" for focused reading one page at a time. "one-column" for continuous scrolling like a web page. "two-column-left" for book-like layouts with odd pages on left (international standard). "two-column-right" for magazines with odd pages on right.

Control the initial display mode when the PDF opens. "full-screen" for presentations and kiosk displays where you want an immersive experience. "thumbnails" for long documents where visual page navigation is helpful. "outlines" for structured documents with bookmarks/table of contents.

Control how the PDF is initially zoomed when opened.

Display the specified page when the document is opened.

Specify the initial page zoom in percents when the document is opened.

Hide the viewer's toolbar when the PDF is opened to provide a cleaner, more focused reading experience. Use this for presentations, kiosk displays, or immersive reading where you want minimal UI distractions.

Hide the viewer's menu bar when the PDF is opened for a cleaner interface. Use this for kiosk mode, presentations, or embedded PDFs where you want to minimize UI elements.

Hide user interface elements like scroll bars and navigation controls when the PDF opens. Use this for presentation mode, digital signage, or embedded PDFs where you want the most minimal interface possible.

Combines with other UI hiding options for full-screen immersive viewing.

Resize the PDF viewer window to fit the size of the first displayed page when opened. Use this to ensure the PDF opens at an appropriate size rather than filling the entire screen.

Particularly useful for small documents, forms, or certificates that look better at actual size.

Position the PDF viewer window in the center of the screen when opened. Use this with window resizing to create a professional, centered display for forms, certificates, or small documents.

Improves the initial viewing experience by avoiding corner-positioned windows.

Display the title of the HTML document in the PDF viewer's title bar instead of the filename. Use this to show more descriptive titles when PDFs are opened - particularly useful when the filename is cryptic or auto-generated.

Improves user experience by showing meaningful document names.

Turn on debug logging to troubleshoot conversion issues. Details about the conversion process, including resource loading, rendering steps, and error messages are stored in the debug log. Use this when conversions fail or produce unexpected results. The URL of the log can be obtained from the getDebugLogUrl method or available in conversion statistics.

Get the URL of the debug log for the last conversion.

Get the number of conversion credits available in your account. Use this to monitor your credit usage and implement alerts before running out of credits.
This method can only be called after a call to one of the convertXtoY methods.
The returned value can differ from the actual count if you run parallel conversions.
The special value 999999 is returned if the information is not available.

Get the number of credits consumed by the last conversion. Use this to track costs per conversion, especially for complex documents or operations that may consume multiple credits.

Get the unique job ID for the conversion. Use this to track conversions in your logs, correlate with debug logs, or reference specific conversions when contacting support.

Get the size of the output document in bytes. Use this to check file sizes before delivery, implement size-based quotas, or optimize storage allocation.

Get the version details including API version, converter version, and client library version. Use this for debugging, logging, or ensuring compatibility when reporting issues.

Tag the conversion with a custom value for tracking and analytics. Use this to categorize conversions by customer ID, document type, or business unit. The tag appears in conversion statistics. A value longer than 32 characters is cut off.

A proxy server used by the conversion process for accessing the source URLs with HTTP scheme. This can help circumvent regional restrictions or provide limited access to your intranet.

A proxy server used by the conversion process for accessing the source URLs with HTTPS scheme. This can help circumvent regional restrictions or provide limited access to your intranet.

Set the converter version. Different versions may produce different output. Choose which one provides the best output for your case.

Specify whether to use HTTP or HTTPS when connecting to the PDFCrowd API.

Specify the User-Agent HTTP header that the client library will use when interacting with the API.

Set a custom user agent HTTP header. It can be useful if you are behind a proxy or a firewall.

Specify an HTTP proxy that the API client library will use to connect to the internet.

Specify the number of automatic retries when a 502 or 503 HTTP status code is received. The status code indicates a temporary network issue. This feature can be disabled by setting to 0.