PDF Underlay (Background) API
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Effortlessly add backgrounds or underlays to your PDF files with our API. Combine your document with a template, form, or letterhead placed beneath the content. Ideal for branding, stationery automation, or generating consistent PDF layouts programmatically.
Claude, ChatGPT, Cursor or your own agent can call
underlay-pdf-pages directly.
Benefits of our PDF Underlay API
Easily apply backgrounds or templates to PDF documents with our powerful PDF Underlay API.
Place letterheads, branding elements, or form layouts beneath existing content while
maintaining full formatting and clarity. Ideal for automating stationery,
corporate design, or consistent reporting, our API streamlines document
preparation and ensures a professional, uniform appearance in every file.
Read our API documentation to learn how to underlay pages in PDFs.
Multi-language Code Example
curl -X POST https://apdf.io/api/pdf/page/underlay \
-H "Authorization: Bearer TOKEN" \
-d file="FILE_URL" \
-d underlay="UNDERLAY_FILE_URL" \
-d from="3" \
-d to="2-z" \
-d repeat="1"const data = new FormData();
data.append('file', 'FILE_URL');
data.append('underlay', 'UNDERLAY_FILE_URL');
data.append('from', '3');
data.append('to', '2-z');
data.append('repeat', '1');
fetch('https://apdf.io/api/pdf/page/underlay', {
headers: {'Authorization': 'Bearer TOKEN'},
method: 'POST',
body: data
})
.then(response => response.json())
.then(json => console.log(json));use GuzzleHttp\Client;
$client = new Client();
$response = $client->post(
'https://apdf.io/api/pdf/page/underlay', [
'headers' => [
'Authorization' => 'Bearer TOKEN'
],
'form_params' => [
'file' => 'FILE_URL',
'underlay' => 'UNDERLAY_FILE_URL',
'from' => '3',
'to' => '2-z',
'repeat' => '1'
]
]);
$body = $response->getBody();
echo json_encode($body->getContents());require 'rest-client'
response = RestClient.post(
'https://apdf.io/api/pdf/page/underlay',
{
'file' => 'FILE_URL',
'underlay' => 'UNDERLAY_FILE_URL',
'from' => '3',
'to' => '2-z',
'repeat' => '1'
},
{
Authorization: "Bearer TOKEN"
}
)
puts response.bodyimport requests
response = requests.post(
'https://apdf.io/api/pdf/page/underlay',
headers = {
'Authorization': 'Bearer TOKEN'
},
data = {
'file': 'FILE_URL',
'underlay': 'UNDERLAY_FILE_URL',
'from': '3',
'to': '2-z',
'repeat': '1'
}
)
print(response.text)import (
"fmt"
"github.com/go-resty/resty/v2"
)
func main() {
client := resty.New()
data := map[string]string{
"file": "FILE_URL",
"underlay": "UNDERLAY_FILE_URL",
"from": "3",
"to": "2-z",
"repeat": "1"
}
resp, _ := client.R().
SetFormData(data).
SetHeader("Authorization", "Bearer TOKEN").
Post("https://apdf.io/api/pdf/page/underlay")
fmt.Println(resp.String())
}import okhttp3.*;
class Pdf {
public static void main(String[] args) throws Exception {
OkHttpClient client = new OkHttpClient();
FormBody formBody = new FormBody.Builder()
.add("file", "FILE_URL")
.add("underlay", "UNDERLAY_FILE_URL")
.add("from", "3")
.add("to", "2-z")
.add("repeat", "1")
.build();
Request request = new Request.Builder()
.url("https://apdf.io/api/pdf/page/underlay")
.addHeader("Authorization", "Bearer TOKEN")
.post(formBody)
.build();
Response response = client.newCall(request).execute();
System.out.println(response.body().string());
}
}No-Code PDF Underlaying (Backgrounds)
Connect our PDF Underlay API with Zapier Webhooks to automate the addition of backgrounds or templates to your PDFs. Place letterheads, branding, or forms beneath content directly from hundreds of supported apps, all without coding. Streamline document preparation, enforce corporate design, and maintain a professional look across every workflow.
Your code made the PDF.
Then it went dark.
Opened, read, re-read, dropped on page 4 — you never see any of it. Share the PDFs you generate through Apdf recipient links, and every signal becomes something you can act on: ping Slack, update the CRM, let an agent follow up. Same account, same API token, one more call.
API · Webhook · MCP