Image to PDF / Golang Reference

class ImageToPdfClient

All setter methods return ImageToPdfClient object unless specified otherwise.

Constructor

func NewImageToPdfClient(userName string, apiKey string) ImageToPdfClient
Constructor for the Pdfcrowd API client.
userName
Your username at Pdfcrowd.
apiKey
Your API key.

Conversion Input

func (client *ImageToPdfClient) ConvertUrl(url string) ([]byte, error)
Convert an image.
url
The address of the image to convert.
The supported protocols are http:// and https://.
Returns
  • []byte - Byte array containing the conversion output. 
func (client *ImageToPdfClient) ConvertUrlToStream(url string, outStream io.Writer) error
Convert an image and write the result to an output stream.
url
The address of the image to convert.
The supported protocols are http:// and https://.
outStream
The output stream that will contain the conversion output. 
func (client *ImageToPdfClient) ConvertUrlToFile(url string, filePath string) error
Convert an image and write the result to a local file.
url
The address of the image to convert.
The supported protocols are http:// and https://.
filePath
The output file path. 
func (client *ImageToPdfClient) ConvertFile(file string) ([]byte, error)
Convert a local file.
file
The path to a local file to convert.
The file must exist and not be empty.
Returns
  • []byte - Byte array containing the conversion output. 
func (client *ImageToPdfClient) ConvertFileToStream(file string, outStream io.Writer) error
Convert a local file and write the result to an output stream.
file
The path to a local file to convert.
The file must exist and not be empty.
outStream
The output stream that will contain the conversion output. 
func (client *ImageToPdfClient) ConvertFileToFile(file string, filePath string) error
Convert a local file and write the result to a local file.
file
The path to a local file to convert.
The file must exist and not be empty.
filePath
The output file path. 
func (client *ImageToPdfClient) ConvertRawData(data []byte) ([]byte, error)
Convert raw data.
data
The raw content to be converted.
Returns
  • []byte - Byte array with the output. 
func (client *ImageToPdfClient) ConvertRawDataToStream(data []byte, outStream io.Writer) error
Convert raw data and write the result to an output stream.
data
The raw content to be converted.
outStream
The output stream that will contain the conversion output. 
func (client *ImageToPdfClient) ConvertRawDataToFile(data []byte, filePath string) error
Convert raw data to a file.
data
The raw content to be converted.
filePath
The output file path. 
func (client *ImageToPdfClient) ConvertStream(inStream io.Reader) ([]byte, error)
Convert the contents of an input stream.
inStream
The input stream with source data.
Returns
  • []byte - Byte array containing the conversion output. 
func (client *ImageToPdfClient) ConvertStreamToStream(inStream io.Reader, outStream io.Writer) error
Convert the contents of an input stream and write the result to an output stream.
inStream
The input stream with source data.
outStream
The output stream that will contain the conversion output. 
func (client *ImageToPdfClient) ConvertStreamToFile(inStream io.Reader, filePath string) error
Convert the contents of an input stream and write the result to a local file.
inStream
The input stream with source data.
filePath
The output file path.

Image Operations

Settings used for operations with images.

func (client *ImageToPdfClient) SetResize(resize string) *ImageToPdfClient
Resize the image.
resize
The resize percentage or new image dimensions.
Default: 100%
Examples:
  • SetResize("200%")
  • SetResize("1024x768") 
func (client *ImageToPdfClient) SetRotate(rotate string) *ImageToPdfClient
Rotate the image.
rotate
The rotation specified in degrees.
Default: 0 
func (client *ImageToPdfClient) SetCropAreaX(x string) *ImageToPdfClient
Set the top left X coordinate of the content area. It is relative to the top left X coordinate of the print area.
x
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Default: 0px
Examples:
  • SetCropAreaX("-1in")
  • SetCropAreaX("2.5cm") 
func (client *ImageToPdfClient) SetCropAreaY(y string) *ImageToPdfClient
Set the top left Y coordinate of the content area. It is relative to the top left Y coordinate of the print area.
y
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Default: 0px
Examples:
  • SetCropAreaY("-1in")
  • SetCropAreaY("2.5cm") 
func (client *ImageToPdfClient) SetCropAreaWidth(width string) *ImageToPdfClient
Set the width of the content area. It should be at least 1 inch.
width
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:
  • SetCropAreaWidth("8in")
  • SetCropAreaWidth("25cm") 
func (client *ImageToPdfClient) SetCropAreaHeight(height string) *ImageToPdfClient
Set the height of the content area. It should be at least 1 inch.
height
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:
  • SetCropAreaHeight("8in")
  • SetCropAreaHeight("25cm") 
func (client *ImageToPdfClient) SetCropArea(x string, y string, width string, height string) *ImageToPdfClient
Set the content area position and size. The content area enables to specify the part to be converted.
x
Set the top left X coordinate of the content area. It is relative to the top left X coordinate of the print area.
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Default: 0px
y
Set the top left Y coordinate of the content area. It is relative to the top left Y coordinate of the print area.
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Default: 0px
width
Set the width of the content area. It should be at least 1 inch.
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 height of the content area. It should be at least 1 inch.
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Default: The height of the print area. 
func (client *ImageToPdfClient) SetRemoveBorders(value bool) *ImageToPdfClient
Remove borders of an image which does not change in color.
value
Set to true to remove borders.
Default: false

Page Setup

func (client *ImageToPdfClient) SetPageSize(size string) *ImageToPdfClient
Set the output page size.
size
Allowed values:
  • A0
  • A1
  • A2
  • A3
  • A4
  • A5
  • A6
  • Letter
func (client *ImageToPdfClient) SetPageWidth(width string) *ImageToPdfClient
Set the output page width.
width
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Examples:
  • SetPageWidth("300mm")
  • SetPageWidth("9.5in") 
func (client *ImageToPdfClient) SetPageHeight(height string) *ImageToPdfClient
Set the output page height.
height
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Examples:
  • SetPageHeight("15.25in")
  • SetPageHeight("350mm") 
func (client *ImageToPdfClient) SetPageDimensions(width string, height string) *ImageToPdfClient
Set the output page dimensions. If no page size is specified, margins are applied as a border around the image.
width
Set the output page width.
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
height
Set the output page height.
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Examples:
  • SetPageDimensions("300mm", "350mm")
  • SetPageDimensions("9.5in", "15.25in")
  • SetPageDimensions("372mm", "520pt") 
func (client *ImageToPdfClient) SetOrientation(orientation string) *ImageToPdfClient
Set the output page orientation.
orientation
Allowed values:
  • landscape
  • portrait
Default: portrait 
func (client *ImageToPdfClient) SetPosition(position string) *ImageToPdfClient
Set the image position on the page.
position
Allowed values:
  • center
  • top
  • bottom
  • left
  • right
  • top-left
  • top-right
  • bottom-left
  • bottom-right
Default: center 
func (client *ImageToPdfClient) SetPrintPageMode(mode string) *ImageToPdfClient
Set the mode to print the image on the content area of the page.
mode
Allowed values:
  • default
    No image scaling.
  • fit
    Fit image to page with aspect ratio.
  • stretch
    Stretch image to the page with no aspect ratio.
Default: default 
func (client *ImageToPdfClient) SetMarginTop(top string) *ImageToPdfClient
Set the output page top margin.
top
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Examples:
  • SetMarginTop("1in")
  • SetMarginTop("2.5cm") 
func (client *ImageToPdfClient) SetMarginRight(right string) *ImageToPdfClient
Set the output page right margin.
right
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Examples:
  • SetMarginRight("1in")
  • SetMarginRight("2.5cm") 
func (client *ImageToPdfClient) SetMarginBottom(bottom string) *ImageToPdfClient
Set the output page bottom margin.
bottom
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Examples:
  • SetMarginBottom("1in")
  • SetMarginBottom("2.5cm") 
func (client *ImageToPdfClient) SetMarginLeft(left string) *ImageToPdfClient
Set the output page left margin.
left
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
Examples:
  • SetMarginLeft("1in")
  • SetMarginLeft("2.5cm") 
func (client *ImageToPdfClient) SetPageMargins(top string, right string, bottom string, left string) *ImageToPdfClient
Set the output page margins.
top
Set the output page top margin.
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
right
Set the output page right margin.
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
bottom
Set the output page bottom margin.
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
left
Set the output page left margin.
The value must be specified in inches "in", millimeters "mm", centimeters "cm", pixels "px", or points "pt".
func (client *ImageToPdfClient) SetPageBackgroundColor(color string) *ImageToPdfClient
The page background color in RGB or RGBA hexadecimal format. The color fills the entire page regardless of the margins. If not page size is specified and the image format supports background (e.g. PDF, PNG), the background color is applied too.
color
The value must be in RRGGBB or RRGGBBAA hexadecimal format.
Examples:
  • red color
    SetPageBackgroundColor("FF0000")
  • green color
    SetPageBackgroundColor("00ff00")
  • green color with 50% opacity
    SetPageBackgroundColor("00ff0080") 
func (client *ImageToPdfClient) SetDpi(dpi int) *ImageToPdfClient
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).
dpi
The DPI value.
Default: 96
Example:
  • The DPI used for printers. 1 inch contains 300 points.
    SetDpi(300)

Watermark & Background

func (client *ImageToPdfClient) SetPageWatermark(watermark string) *ImageToPdfClient
Apply a watermark to each page of the output PDF file. 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.
watermark
The file path to a local file.
The file must exist and not be empty.
Examples:
  • SetPageWatermark("/home/user/john/watermark.pdf")
  • SetPageWatermark("/home/user/john/watermark.png") 
func (client *ImageToPdfClient) SetPageWatermarkUrl(url string) *ImageToPdfClient
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.
url
The supported protocols are http:// and https://.
Examples:
  • SetPageWatermarkUrl("http://myserver.com/watermark.pdf")
  • SetPageWatermarkUrl("http://myserver.com/watermark.png") 
func (client *ImageToPdfClient) SetMultipageWatermark(watermark string) *ImageToPdfClient
Apply each page of a watermark to the corresponding page of the output PDF. A watermark can be either a PDF or an image.
watermark
The file path to a local file.
The file must exist and not be empty.
Examples:
  • SetMultipageWatermark("/home/user/john/watermark.pdf")
  • SetMultipageWatermark("/home/user/john/watermark.png") 
func (client *ImageToPdfClient) SetMultipageWatermarkUrl(url string) *ImageToPdfClient
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.
url
The supported protocols are http:// and https://.
Examples:
  • SetMultipageWatermarkUrl("http://myserver.com/watermark.pdf")
  • SetMultipageWatermarkUrl("http://myserver.com/watermark.png") 
func (client *ImageToPdfClient) SetPageBackground(background string) *ImageToPdfClient
Apply a background to each page of the output PDF file. 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.
background
The file path to a local file.
The file must exist and not be empty.
Examples:
  • SetPageBackground("/home/user/john/background.pdf")
  • SetPageBackground("/home/user/john/background.png") 
func (client *ImageToPdfClient) SetPageBackgroundUrl(url string) *ImageToPdfClient
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.
url
The supported protocols are http:// and https://.
Examples:
  • SetPageBackgroundUrl("http://myserver.com/background.pdf")
  • SetPageBackgroundUrl("http://myserver.com/background.png") 
func (client *ImageToPdfClient) SetMultipageBackground(background string) *ImageToPdfClient
Apply each page of a background to the corresponding page of the output PDF. A background can be either a PDF or an image.
background
The file path to a local file.
The file must exist and not be empty.
Examples:
  • SetMultipageBackground("/home/user/john/background.pdf")
  • SetMultipageBackground("/home/user/john/background.png") 
func (client *ImageToPdfClient) SetMultipageBackgroundUrl(url string) *ImageToPdfClient
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.
url
The supported protocols are http:// and https://.
Examples:
  • SetMultipageBackgroundUrl("http://myserver.com/background.pdf")
  • SetMultipageBackgroundUrl("http://myserver.com/background.png")

PDF Format

Miscellaneous values for PDF output.

func (client *ImageToPdfClient) SetLinearize(value bool) *ImageToPdfClient
Create linearized PDF. This is also known as Fast Web View.
value
Set to true to create linearized PDF.
Default: false 
func (client *ImageToPdfClient) SetEncrypt(value bool) *ImageToPdfClient
Encrypt the PDF. This prevents search engines from indexing the contents.
value
Set to true to enable PDF encryption.
Default: false 
func (client *ImageToPdfClient) SetUserPassword(password string) *ImageToPdfClient
Protect the PDF with a user password. When a PDF has a user password, it must be supplied in order to view the document and to perform operations allowed by the access permissions.
password
The user password.
Example:
  • SetUserPassword("123456") 
func (client *ImageToPdfClient) SetOwnerPassword(password string) *ImageToPdfClient
Protect the PDF with an owner password. Supplying an owner password grants unlimited access to the PDF including changing the passwords and access permissions.
password
The owner password.
Example:
  • SetOwnerPassword("123456") 
func (client *ImageToPdfClient) SetNoPrint(value bool) *ImageToPdfClient
Disallow printing of the output PDF.
value
Set to true to set the no-print flag in the output PDF.
Default: false 
func (client *ImageToPdfClient) SetNoModify(value bool) *ImageToPdfClient
Disallow modification of the output PDF.
value
Set to true to set the read-only only flag in the output PDF.
Default: false 
func (client *ImageToPdfClient) SetNoCopy(value bool) *ImageToPdfClient
Disallow text and graphics extraction from the output PDF.
value
Set to true to set the no-copy flag in the output PDF.
Default: false 
func (client *ImageToPdfClient) SetTitle(title string) *ImageToPdfClient
Set the title of the PDF.
title
The title.
Example:
  • SetTitle("My Resume") 
func (client *ImageToPdfClient) SetSubject(subject string) *ImageToPdfClient
Set the subject of the PDF.
subject
The subject.
Example:
  • SetSubject("CV - Software Developer") 
func (client *ImageToPdfClient) SetAuthor(author string) *ImageToPdfClient
Set the author of the PDF.
author
The author.
Example:
  • SetAuthor("John Doe") 
func (client *ImageToPdfClient) SetKeywords(keywords string) *ImageToPdfClient
Associate keywords with the document.
keywords
The string with the keywords.
Example:
  • SetKeywords("software developer, Unix, databases")

Viewer Preferences

These preferences specify how a PDF viewer should present the document. The preferences may be ignored by some PDF viewers.

func (client *ImageToPdfClient) SetPageLayout(layout string) *ImageToPdfClient
Specify the page layout to be used when the document is opened.
layout
Allowed values:
  • single-page
    Display one page at a time.
  • one-column
    Display the pages in one column.
  • two-column-left
    Display the pages in two columns, with odd-numbered pages on the left.
  • two-column-right
    Display the pages in two columns, with odd-numbered pages on the right. 
func (client *ImageToPdfClient) SetPageMode(mode string) *ImageToPdfClient
Specify how the document should be displayed when opened.
mode
Allowed values:
  • full-screen
    Full-screen mode.
  • thumbnails
    Thumbnail images are visible.
  • outlines
    Document outline is visible. 
func (client *ImageToPdfClient) SetInitialZoomType(zoomType string) *ImageToPdfClient
Specify how the page should be displayed when opened.
zoomType
Allowed values:
  • fit-width
    The page content is magnified just enough to fit the entire width of the page within the window.
  • fit-height
    The page content is magnified just enough to fit the entire height of the page within the window.
  • fit-page
    The page content is magnified just enough to fit the entire page within the window both horizontally and vertically. If the required horizontal and vertical magnification factors are different, use the smaller of the two, centering the page within the window in the other dimension. 
func (client *ImageToPdfClient) SetInitialPage(page int) *ImageToPdfClient
Display the specified page when the document is opened.
page
Must be a positive integer number.
Example:
  • SetInitialPage(2) 
func (client *ImageToPdfClient) SetInitialZoom(zoom int) *ImageToPdfClient
Specify the initial page zoom in percents when the document is opened.
zoom
Must be a positive integer number.
Example:
  • SetInitialZoom(50) 
func (client *ImageToPdfClient) SetHideToolbar(value bool) *ImageToPdfClient
Specify whether to hide the viewer application's tool bars when the document is active.
value
Set to true to hide tool bars.
Default: false 
func (client *ImageToPdfClient) SetHideMenubar(value bool) *ImageToPdfClient
Specify whether to hide the viewer application's menu bar when the document is active.
value
Set to true to hide the menu bar.
Default: false 
func (client *ImageToPdfClient) SetHideWindowUi(value bool) *ImageToPdfClient
Specify whether to hide user interface elements in the document's window (such as scroll bars and navigation controls), leaving only the document's contents displayed.
value
Set to true to hide ui elements.
Default: false 
func (client *ImageToPdfClient) SetFitWindow(value bool) *ImageToPdfClient
Specify whether to resize the document's window to fit the size of the first displayed page.
value
Set to true to resize the window.
Default: false 
func (client *ImageToPdfClient) SetCenterWindow(value bool) *ImageToPdfClient
Specify whether to position the document's window in the center of the screen.
value
Set to true to center the window.
Default: false 
func (client *ImageToPdfClient) SetDisplayTitle(value bool) *ImageToPdfClient
Specify whether the window's title bar should display the document title. If false , the title bar should instead display the name of the PDF file containing the document.
value
Set to true to display the title.
Default: false

Miscellaneous

func (client *ImageToPdfClient) SetDebugLog(value bool) *ImageToPdfClient
Turn on the debug logging. Details about the conversion are stored in the debug log. The URL of the log can be obtained from the getDebugLogUrl method or available in conversion statistics.
value
Set to true to enable the debug logging.
Default: false 
func (client *ImageToPdfClient) GetDebugLogUrl() string
Get the URL of the debug log for the last conversion.
Returns
  • string - The link to the debug log. 
func (client *ImageToPdfClient) GetRemainingCreditCount() int
Get the number of conversion credits available in your account.
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. 
func (client *ImageToPdfClient) GetConsumedCreditCount() int
Get the number of credits consumed by the last conversion.
Returns
  • int - The number of credits. 
func (client *ImageToPdfClient) GetJobId() string
Get the job id.
Returns
  • string - The unique job identifier. 
func (client *ImageToPdfClient) GetOutputSize() int
Get the size of the output in bytes.
Returns
  • int - The count of bytes. 
func (client *ImageToPdfClient) GetVersion() string
Get the version details.
Returns
  • string - API version, converter version, and client version. 
func (client *ImageToPdfClient) SetTag(tag string) *ImageToPdfClient
Tag the conversion with a custom value. The tag is used in conversion statistics. A value longer than 32 characters is cut off.
tag
A string with the custom tag.
Example:
  • SetTag("client-1234") 
func (client *ImageToPdfClient) SetHttpProxy(proxy string) *ImageToPdfClient
A proxy server used by Pdfcrowd conversion process for accessing the source URLs with HTTP scheme. It can help to circumvent regional restrictions or provide limited access to your intranet.
proxy
The value must have format DOMAIN_OR_IP_ADDRESS:PORT.
Examples:
  • SetHttpProxy("myproxy.com:8080")
  • SetHttpProxy("113.25.84.10:33333") 
func (client *ImageToPdfClient) SetHttpsProxy(proxy string) *ImageToPdfClient
A proxy server used by Pdfcrowd conversion process for accessing the source URLs with HTTPS scheme. It can help to circumvent regional restrictions or provide limited access to your intranet.
proxy
The value must have format DOMAIN_OR_IP_ADDRESS:PORT.
Examples:
  • SetHttpsProxy("myproxy.com:443")
  • SetHttpsProxy("113.25.84.10:44333")

API Client Options

func (client *ImageToPdfClient) SetConverterVersion(version string) *ImageToPdfClient
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.
version
The version identifier.
Allowed values:
  • 24.04
    Version 24.04.
  • 20.10
    Version 20.10.
  • 18.10
    Version 18.10.
Default: 24.04 
func (client *ImageToPdfClient) SetUseHttp(value bool) *ImageToPdfClient
Specifies if the client communicates over HTTP or HTTPS with Pdfcrowd API.
value
Set to true to use HTTP.
Default: false

Warning

Using HTTP is insecure as data sent over HTTP is not encrypted. Enable this option only if you know what you are doing.

func (client *ImageToPdfClient) SetUserAgent(agent string) *ImageToPdfClient
Set a custom user agent HTTP header. It can be useful if you are behind a proxy or a firewall.
agent
The user agent string.
Default: pdfcrowd_go_client/6.3.0 (https://pdfcrowd.com) 
func (client *ImageToPdfClient) SetProxy(host string, port int, userName string, password string) *ImageToPdfClient
Specifies an HTTP proxy that the API client library will use to connect to the internet.
host
The proxy hostname.
port
The proxy port.
userName
The username.
password
The password. 
func (client *ImageToPdfClient) SetRetryCount(count int) *ImageToPdfClient
Specifies the number of automatic retries when the 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.
count
Number of retries.
Default: 1
Example:
  • SetRetryCount(3)