Polish characters are missing in the PDF output

Windows uses the font name Segoe UI for Polish. Please refer to this article. To add this font name, please try the sample below.

POST /v1/pdf/edit/add HTTP/1.1
Host: api.pdf.co
Content-Type: application/json
x-api-key: YOUR_API_KEY
Content-Length: 334

{
    "async": false,
    "encrypt": false,
    "inline": true,
    "name": "result",
    "url": "https://fileurl",
    "fields": [

       {
            "fieldName": "sample_field_name",
            "pages": "0", 
            "text": "Polish characters are as follows: ą ć ę ł ń ó ś ż ź",
            "fontName": "Segoe UI"
        }
    ]
}

The simplified parameter version is as follows:

"fieldsString":"0;fieldName;Field Text;12+bold+italic+underline+strikeout;FontName"

Zapier

To add a font name in the PDF.co PDF Filler Fillable Fields field, please use the following format:

0;fieldName;Field Text;12+bold+italic+underline+strikeout;FontName

0;sample_field_name;Polish characters are as follows: ą ć ę ł ń ó ś ż ź;;Segoe UI

Integromat/Make

To add a font name in the PDF.co Fill a PDF Form, please add an item under Fields and fill the Font Name field.