Image to Image / Java Reference

class ImageToImageClient

All setter methods return ImageToImageClient object unless specified otherwise.

Constructor

public ImageToImageClient(String userName, String apiKey)

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.

Parameters:
  • userName - Your username at PDFCrowd.
  • apiKey - Your API key.

Conversion Input

public byte[] convertUrl(String url)

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.

Parameter:
  • url - The address of the image to convert.
    Constraint:
    • Supported protocols are http:// and https://.
Returns:
byte[] - Byte array containing the conversion output.

public void convertUrlToStream(String url, OutputStream outStream)

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.

Parameters:
  • url - The address of the image to convert.
    Constraint:
    • Supported protocols are http:// and https://.
  • outStream (OutputStream) - The output stream that will contain the conversion output.

public void convertUrlToFile(String url, String filePath) throws IOException

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.

Parameters:
  • url - The address of the image to convert.
    Constraint:
    • Supported protocols are http:// and https://.
  • filePath - The output file path.

public byte[] convertFile(String file)

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.

Parameter:
  • file - The path to a local file to convert.
    Constraint:
    • The file must exist and not be empty.
Returns:
byte[] - Byte array containing the conversion output.

public void convertFileToStream(String file, OutputStream outStream)

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.

Parameters:
  • file - The path to a local file to convert.
    Constraint:
    • The file must exist and not be empty.
  • outStream (OutputStream) - The output stream that will contain the conversion output.

public void convertFileToFile(String file, String filePath) throws IOException

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.

Parameters:
  • file - The path to a local file to convert.
    Constraint:
    • The file must exist and not be empty.
  • filePath - The output file path.

public byte[] convertRawData(byte[] data)

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.

Parameter:
  • data (byte[]) - The raw content to be converted.
Returns:
byte[] - Byte array with the output.

public void convertRawDataToStream(byte[] data, OutputStream outStream)

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.

Parameters:
  • data (byte[]) - The raw content to be converted.
  • outStream (OutputStream) - The output stream that will contain the conversion output.

public void convertRawDataToFile(byte[] data, String filePath) throws IOException

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.

Parameters:
  • data (byte[]) - The raw content to be converted.
  • filePath - The output file path.

public byte[] convertStream(InputStream inStream) throws IOException

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.

Parameter:
  • inStream (InputStream) - The input stream with source data.
Returns:
byte[] - Byte array containing the conversion output.

public void convertStreamToStream(InputStream inStream, OutputStream outStream) throws IOException

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.

Parameters:
  • inStream (InputStream) - The input stream with source data.
  • outStream (OutputStream) - The output stream that will contain the conversion output.

public void convertStreamToFile(InputStream inStream, String filePath) throws IOException

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.

Parameters:
  • inStream (InputStream) - The input stream with source data.
  • filePath - The output file path.

Conversion Format

public ImageToImageClient setOutputFormat(String outputFormat)

The output file format.

Parameter:
  • outputFormat
    Allowed Values:
    • png
    • jpg
    • gif
    • tiff
    • bmp
    • ico
    • ppm
    • pgm
    • pbm
    • pnm
    • psb
    • pct
    • ras
    • tga
    • sgi
    • sun
    • webp
    Default:
    png

Image Operations

Settings used for operations with images.

public ImageToImageClient setResize(String resize)

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

Parameter:
  • resize - The resize percentage or new image dimensions.
    Default:
    100%
Examples:
  • Enlarge for high-res display: setResize("200%")
  • Standard XGA screen resolution: setResize("1024x768")

public ImageToImageClient setRotate(String rotate)

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

Parameter:
  • rotate - The rotation specified in degrees.

public ImageToImageClient setCropAreaX(String x)

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.

Parameter:
  • x
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
    Default:
    0px
Examples:
  • Crop extends beyond left edge: setCropAreaX("-1in")
  • Skip narrow border area: setCropAreaX("10mm")

public ImageToImageClient setCropAreaY(String y)

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.

Parameter:
  • y
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
    Default:
    0px
Examples:
  • Crop extends beyond top edge: setCropAreaY("-1in")
  • Skip narrow border area: setCropAreaY("10mm")

public ImageToImageClient setCropAreaWidth(String width)

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

Parameter:
  • width
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
    Default:
    The width of the print area.
Examples:
  • Standard document crop width: setCropAreaWidth("8in")
  • Full A4 page width crop: setCropAreaWidth("210mm")

public ImageToImageClient setCropAreaHeight(String height)

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

Parameter:
  • height
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
    Default:
    The height of the print area.
Examples:
  • Standard US Letter crop height: setCropAreaHeight("11in")
  • Full A4 page height crop: setCropAreaHeight("297mm")

public ImageToImageClient setCropArea(String x, String y, String width, String height)

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.

Parameters:
  • x - 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.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
    Default:
    0px
  • y - 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.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
    Default:
    0px
  • width - Set the horizontal extent of the crop area. Defines the width of the region to be converted. Minimum value is 1 inch.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
    Default:
    The width of the print area.
  • height - Set the vertical extent of the crop area. Defines the height of the region to be converted. Minimum value is 1 inch.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
    Default:
    The height of the print area.

public ImageToImageClient setRemoveBorders(boolean value)

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

Parameter:
  • value (bool) - Set to true to remove borders.
    Default:
    false

Canvas Setup

public ImageToImageClient setCanvasSize(String size)

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

Parameter:
  • size
    Allowed Values:
    • A0
    • A1
    • A2
    • A3
    • A4
    • A5
    • A6
    • Letter

public ImageToImageClient setCanvasWidth(String width)

Set the output canvas width.

Parameter:
  • width
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
Examples:
  • A4 landscape / banner width: setCanvasWidth("297mm")
  • US Letter standard width: setCanvasWidth("8.5in")

public ImageToImageClient setCanvasHeight(String height)

Set the output canvas height.

Parameter:
  • height
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
Examples:
  • Large poster canvas height: setCanvasHeight("420mm")
  • US Letter standard height: setCanvasHeight("11in")

public ImageToImageClient setCanvasDimensions(String width, String height)

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

Parameters:
  • width - Set the output canvas width.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
  • height - Set the output canvas height.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
Examples:
  • A4 portrait dimensions: setCanvasDimensions("210mm", "297mm")
  • US Letter dimensions: setCanvasDimensions("8.5in", "11in")
  • A3 portrait dimensions: setCanvasDimensions("297mm", "420mm")

public ImageToImageClient setOrientation(String orientation)

Set the output canvas orientation. Use portrait for vertical content, landscape for horizontal or wide content.

Parameter:
  • orientation
    Allowed Values:
    • landscape
    • portrait
    Default:
    portrait

public ImageToImageClient setPosition(String position)

Set the image position on the canvas. Center for balanced composition, or corner/edge positions for specific layouts.

Parameter:
  • position
    Allowed Values:
    • center
    • top
    • bottom
    • left
    • right
    • top-left
    • top-right
    • bottom-left
    • bottom-right
    Default:
    center

public ImageToImageClient setPrintCanvasMode(String mode)

Set the mode to print the image on the canvas.

Parameter:
  • mode
    Allowed Values:
    • default — No image scaling.
    • fit — Fit the image to the canvas with aspect ratio.
    • stretch — Stretch the image to the canvas with no aspect ratio.
    Default:
    default

public ImageToImageClient setMarginTop(String top)

Set the output canvas top margin.

Parameter:
  • top
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
Examples:
  • Wide margin for framing: setMarginTop("1in")
  • Minimal margin for web images: setMarginTop("10mm")

public ImageToImageClient setMarginRight(String right)

Set the output canvas right margin.

Parameter:
  • right
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
Examples:
  • Wide margin for framing: setMarginRight("1in")
  • Minimal margin for web images: setMarginRight("10mm")

public ImageToImageClient setMarginBottom(String bottom)

Set the output canvas bottom margin.

Parameter:
  • bottom
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
Examples:
  • Wide margin for framing: setMarginBottom("1in")
  • Minimal margin for web images: setMarginBottom("10mm")

public ImageToImageClient setMarginLeft(String left)

Set the output canvas left margin.

Parameter:
  • left
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
Examples:
  • Wide margin for framing: setMarginLeft("1in")
  • Minimal margin for web images: setMarginLeft("10mm")

public ImageToImageClient setMargins(String top, String right, String bottom, String left)

Set the output canvas margins. Create white space around the image for framing, borders, or print bleed.

Parameters:
  • top - Set the output canvas top margin.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
  • right - Set the output canvas right margin.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
  • bottom - Set the output canvas bottom margin.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.
  • left - Set the output canvas left margin.
    Constraint:
    • The value must be specified in inches 'in', millimeters 'mm', centimeters 'cm', pixels 'px', or points 'pt'.

public ImageToImageClient setCanvasBackgroundColor(String color)

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

Parameter:
  • color
    Constraint:
    • The value must be in RRGGBB or RRGGBBAA hexadecimal format.
Examples:
  • red color: setCanvasBackgroundColor("FF0000")
  • green color: setCanvasBackgroundColor("00ff00")
  • green color with 50% opacity: setCanvasBackgroundColor("00ff0080")

public ImageToImageClient setDpi(int dpi)

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).

Parameter:
  • dpi (int) - The DPI value.
    Default:
    96
Example:
  • The DPI used for printers. 1 inch contains 300 points: setDpi(300)

Miscellaneous

public ImageToImageClient setDebugLog(boolean value)

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.

Parameter:
  • value (bool) - Set to true to enable debug logging.
    Default:
    false

public String getDebugLogUrl()

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

Returns:
String - The link to the debug log.

public int getRemainingCreditCount()

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.

Returns:
int - The number of credits.

public int getConsumedCreditCount()

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.

Returns:
int - The number of credits.

public String getJobId()

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.

Returns:
String - The unique job identifier.

public int getOutputSize()

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.

Returns:
int - The count of bytes.

public String getVersion()

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

Returns:
String - API version, converter version, and client version.

public ImageToImageClient setTag(String tag)

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.

Parameter:
  • tag - A string with the custom tag.
Example:
  • Track job in analytics: setTag("client-1234")

public ImageToImageClient setHttpProxy(String proxy)

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.

Parameter:
  • proxy
    Constraint:
    • The value must have format DOMAIN_OR_IP_ADDRESS:PORT.
Examples:
  • Corporate proxy server: setHttpProxy("myproxy.com:8080")
  • Direct IP proxy connection: setHttpProxy("113.25.84.10:33333")

public ImageToImageClient setHttpsProxy(String proxy)

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.

Parameter:
  • proxy
    Constraint:
    • The value must have format DOMAIN_OR_IP_ADDRESS:PORT.
Examples:
  • Secure proxy for HTTPS: setHttpsProxy("myproxy.com:443")
  • Direct secure proxy IP: setHttpsProxy("113.25.84.10:44333")

API Client Options

public ImageToImageClient setConverterVersion(String version)

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

Availability:
API client >= 5.0.0. See versioning.
Parameter:
  • version - The version identifier.
    Allowed Values:
    • 24.04 — Version 24.04.
    • 20.10 — Version 20.10.
    • 18.10 — Version 18.10.
    • latest — Version 20.10 is used.
    Default:
    24.04

public ImageToImageClient setUseHttp(boolean value)

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

Parameter:
  • value (bool) - Set to true to use HTTP.
    Default:
    false

public ImageToImageClient setClientUserAgent(String agent)

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

Availability:
API client >= 6.4.0 See versioning.
Parameter:
  • agent - The user agent string.

public ImageToImageClient setUserAgent(String agent)

Deprecated Replaced with: setClientUserAgent

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

Parameter:
  • agent - The user agent string.
    Default:
    pdfcrowd_java_client/6.5.4 (https://pdfcrowd.com)

public ImageToImageClient setProxy(String host, int port, String userName, String password)

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

Parameters:
  • host - The proxy hostname.
  • port (int) - The proxy port.
  • userName - The username.
  • password - The password.

public ImageToImageClient setRetryCount(int count)

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.

Parameter:
  • count (int) - Number of retries.
    Default:
    1
Example:
  • Retry failed requests three times: setRetryCount(3)