Watermark PNG API

Watermark PNG image. Stamp a PNG with the text.


Add text watermark to PNG image easily with Watermark PNG API.

Try for FREE

API Endpoint

ConvertAPI offers a cloud-based solution, which makes Watermark PNG conversion effortless with just a single REST-API call:


Authenticate your API call

Converting png to watermark via REST-API is now easier than ever. Sign up for a free account to obtain your authentication secret, append it as a query string parameter to the conversion URL, and voilĂ ! You can find advanced authentication techniques in our docs.


Watermark PNG using REST-API in no time!

Once you have your authentication in place, you can convert your files using application/json, multipart/form-data and application/octet-stream content types. A simple HTTP POST request using JSON would look like this:

// Code snippet is using the ConvertAPI JavaScript Client: https://github.com/ConvertAPI/convertapi-js

// Code snippet is using the ConvertAPI Node.js Client: https://github.com/ConvertAPI/convertapi-nodejs

// Code snippet is using the ConvertAPI PHP Client: https://github.com/ConvertAPI/convertapi-php

// Code snippet is using the ConvertAPI Java Client: https://github.com/ConvertAPI/convertapi-java

// Code snippet is using the ConvertAPI C# Client: https://github.com/ConvertAPI/convertapi-dotnet

# Code snippet is using the ConvertAPI Ruby Client: https://github.com/ConvertAPI/convertapi-ruby

# Code snippet is using the ConvertAPI Python Client: https://github.com/ConvertAPI/convertapi-python

// Code snippet is using the ConvertAPI Go Client: https://github.com/ConvertAPI/convertapi-go

REM Code snippet is using the command line utility program: https://github.com/ConvertAPI/convertapi-cli

<!-- For conversions with the multiple file result please refer to this example: https://repl.it/@ConvertAPI/HTML-Form-with-multiple-file-result -->

Conversion request using cURL

You can easily convert png to watermark with a simple cURL request. Our documentation provides more advanced cURL request techniques.

File conversion using CLI

ConvertAPI CLI allows you to convert files using our command-line file conversion utility tool. Check out CLI documentation for a detailed explanation and usage examples.

REM Code snippet is using the command line utility program: https://github.com/ConvertAPI/convertapi-cli

Upload the file and see how it works

You can set up the advanced conversion parameters and test the conversion result online using our interactive demo tool. It will auto-generate the code snippet for you!

Advanced Watermark PNG conversion parameters

Text String

Specifies the text to use as watermark. The list of supported variables:

  • %PAGE% - current page number
  • %PAGES% - total number of pages
  • %FILENAME% - name of the file
  • %WEEKDAY% - full weekday name
  • %WEEKDAY_SHORT% - abbreviated weekday name
  • %MONTH% - month number (1-12)
  • %MONTHNAME% - full month name
  • %MONTHNAME_SHORT% - abbreviated month name
  • %YEAR% - year with century (YYYY)
  • %YEAR_SHORT% - year without century (YY)
  • %DAY% - day of month
  • %DAY_YEAR% - day of the year (1 -366)
  • %HOUR% - hour (01- 12)
  • %HOURS% - hour (00-23)
  • %MINUTES% - minutes (00-59)
  • %SECONDS% - seconds (00-59)
  • %AMPM% - AM PM
  • %DATE% - local date representation
  • %TIME% - local time representation
  • %DATETIME% - local date and time
  • %AUTHOR% - document Author
  • %TITLE% - document Title
  • %SUBJECT% - document Subject
  • %KEYWORDS% - document Keywords
FontName Collection

Specifies the watermark font name. Contact us if you are looking for a specific font for a watermark that is missing from the list.

Values:   Arial Bahnschrift Calibri Cambria Consolas Constantia Courier New Georgia Tahoma Times New Roman Verdana

FontSize Integer

Specifies the watermark font size.

FontColor String

Specifies the watermark font color.

StrokeColor String

Specifies font stroke color.

StrokeWidth Integer

Specifies the stroke width.

FontEmbed Bool

Specifies whether fonts should be embedded.

FontSubset Bool

Specifies whether fonts should be subset.

FontEncoding String

Specifies the font encoding.

TextRenderingMode Collection

Specifies the text rendering mode.

Values:   filltext stroketext fillstroke invisible

Rotate Integer

Specifies the watermark rotation angle in degrees.

HorizontalAlignment Collection

Specifies the horizontal watermark alignment.

Values:   left center right

VerticalAlignment Collection

Specifies the vertical watermark alignment.

Values:   top center bottom

PositionX Integer

Specifies the watermark X coordinate. If set overrides property HorizontalAlignment.

PositionY Integer

Specifies the watermark Y coordinate. If set overrides property VerticalAlignment.

PositionUnit Collection

Specifies measurement unit to use for the PositionX and PositionY properties.

Values:   pt in mm cm

Opacity Integer

Specifies watermark opacity level.

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