Add background image to invoice
Custom background images can be used in invoices, to insert them into templates, you’ll need to inject the base64 encoded value of your image. To convert your image to base64, you can use the free tool at:
In InvoiceNinja, navigate to:
Settings > Invoice Design
Click Customize (select one of the drop downs)
On the next screen at the bottom of the blueish box, load the Photo Design.
Then below the Content Tab, change the dropdown “Form” To “Code”
In the code box find the “image“: “data….” tag and remove all of the data from between the quotes “data…….” section leaving just the quotes and replace all that scrambled text with the Base64 encoded string of your image file.