How To Add Watermark in the Odoo Report (pdf)

To protect the integrity of the document and prevent the counterfeiting, it is a good idea to have a watermark in your Odoo reports, such as Sales Quotation, Invoice, Delivery Order, etc.

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There are 2 methods to add watermark in the background of the Odoo report:

1) Wording such as the Status of the document - eg, Draft, Original, Confidential, etc.

This can be achieve by using the CSS transform property in the Qweb.

<div class="page">

<style>

.watermark {

position: absolute;

opacity:0.2;

font-size:100px;

width:50%;

text-align:center;

z-index:99;

border: 2px solid black;

-webkit-transform: rotate(-30deg);

}

</style>

</div>

<div class="watermark" style="top: 600px; right: 230px;">
  <span t-field="o.status"/><br/>
 </div>

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2) Image such as the company logo.

This can be achieve by using the OCA module

report_qweb_pdf_watermark

note 1: This will add watermark to all the documents in Odoo.

note 2: Wkhtmltopdf version must be 0.12.5 or above.

You may want to enhance the module to enable the upload of the watermark pdf per company (in multi-companies scenario).

These are 2 websites that are handy to create a nice watermark in pdf.

a) Tone down the logo (jpg or png) opaqueness

b) Convert JPG to pdf

You may want to enhance the report_qweb_pdf_watermark module, report.py to use your uploaded watermark pdf.

@api.model
 def _run_wkhtmltopdf(self, bodies, header=None, footer=None,
  landscape=False, specific_paperformat_args=None,
  set_viewport_size=False):
  result = super(Report, self)._run_wkhtmltopdf(
  bodies, header=header, footer=footer, landscape=landscape,
  specific_paperformat_args=specific_paperformat_args,
  set_viewport_size=set_viewport_size)
 
  docids = self.env.context.get('res_ids', False)
  watermark = None
  company = self.env['res.company'].browse(self.env.user.company_id.id)
  # if self.pdf_watermark:
  # watermark = b64decode(self.pdf_watermark)
  if company.upload_image:
  watermark = b64decode(company.upload_image)
  elif docids:
  watermark = tools.safe_eval(
  self.pdf_watermark_expression or 'None',
  dict(env=self.env, docs=self.env[self.model].browse(docids)),
  )
  if watermark:
  watermark = b64decode(watermark)
 
  if not watermark:
  return result

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