Word to PDF API#

The Word to PDF API converts Microsoft Word documents (.doc, .docx) to PDF via POST /v1/convert/doc-to-pdf, using LibreOffice's high-fidelity rendering engine. The document's own formatting, fonts, and page layout are preserved in the PDF output. The response is raw PDF bytes by default, or JSON metadata with a presigned download URL when direct_download=false.

Endpoint#

POST /v1/convert/doc-to-pdf

Content-Type: multipart/form-data

Accepted input: .docx or .doc files

Output format: .pdf (application/pdf)

Authentication#

Requires either a private API key or a JWT token from a public key.

X-API-Key: sk_your_private_key

Or:

Authorization: Bearer <jwt_token>

Request Parameters#

PDF Options#

For document converters powered by LibreOffice, page layout (size, margins, orientation) is determined by the document's own settings. The only pdf_options field that applies is:

Conversion Details#

• Uses LibreOffice (via unoserver) for server-side document rendering
• The document's own formatting, fonts, page layout, and embedded media are preserved
• Conversion timeout: 120 seconds
• The output faithfully reproduces the document as it would appear when printed from LibreOffice

Response#

Direct Download (direct_download=true, default)#

HTTP 200 OK
Content-Type: application/pdf
Content-Disposition: inline; filename="document_20260405_123456789.pdf"

Returns raw PDF bytes.

Metadata Response (direct_download=false)#

{
    "presigned_url": "https://spaces.example.com/...",
    "object_key": "env/files/{project_id}/doc-to-pdf/document_20260405_123456789.pdf",
    "filename": "document_20260405_123456789.pdf",
    "file_size": 67890,
    "conversion_time_seconds": 3.5
}

Code Examples#

Python#

import requests

with open("document.docx", "rb") as f:
    response = requests.post(
        "https://api.enconvert.com/v1/convert/doc-to-pdf",
        headers={"X-API-Key": "sk_your_private_key"},
        files={"file": ("document.docx", f)}
    )

with open("output.pdf", "wb") as out:
    out.write(response.content)

Node.js#

const form = new FormData();
form.append("file", fs.createReadStream("document.docx"));

const response = await fetch("https://api.enconvert.com/v1/convert/doc-to-pdf", {
    method: "POST",
    headers: { "X-API-Key": "sk_your_private_key" },
    body: form
});

fs.writeFileSync("output.pdf", Buffer.from(await response.arrayBuffer()));

PHP#

$ch = curl_init("https://api.enconvert.com/v1/convert/doc-to-pdf");
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ["X-API-Key: sk_your_private_key"],
    CURLOPT_POSTFIELDS => ["file" => new CURLFile("document.docx")]
]);
$pdf = curl_exec($ch);
curl_close($ch);
file_put_contents("output.pdf", $pdf);

Go#

body := &bytes.Buffer{}
writer := multipart.NewWriter(body)
part, _ := writer.CreateFormFile("file", "document.docx")
file, _ := os.Open("document.docx")
io.Copy(part, file)
writer.Close()

req, _ := http.NewRequest("POST", "https://api.enconvert.com/v1/convert/doc-to-pdf", body)
req.Header.Set("Content-Type", writer.FormDataContentType())
req.Header.Set("X-API-Key", "sk_your_private_key")
resp, _ := http.DefaultClient.Do(req)

With Grayscale Output#

import requests
import json

with open("document.docx", "rb") as f:
    response = requests.post(
        "https://api.enconvert.com/v1/convert/doc-to-pdf",
        headers={"X-API-Key": "sk_your_private_key"},
        files={"file": ("document.docx", f)},
        data={"pdf_options": json.dumps({"grayscale": True})}
    )

Error Responses#

Limits#

Frequently asked questions#

How do I convert a DOCX file to PDF with a REST API?#

Send a multipart/form-data request to POST /v1/convert/doc-to-pdf with your .docx or .doc file in the file field, authenticated via X-API-Key or a Bearer JWT. By default the response is the raw PDF bytes with Content-Type: application/pdf.

Does Word to PDF conversion preserve fonts and formatting?#

Yes. The endpoint uses LibreOffice (via unoserver) for server-side rendering, so the document's own formatting, fonts, page layout, and embedded media are preserved. The output reproduces the document as it would appear when printed from LibreOffice.

Can I change page size, margins, or orientation when converting Word to PDF?#

No. Page layout is determined by the document's own settings, and the only supported pdf_options field on this endpoint is grayscale. To change page layout, modify the source document before uploading.

Why did my Word to PDF conversion fail or time out?#

A 400 Bad Request means the file is not .docx or .doc, is corrupt or unsupported, or the pdf_options JSON is invalid. A 500 Internal Server Error means the conversion exceeded the 120-second timeout.

Can I get a download URL instead of the PDF bytes?#

Yes. Set direct_download=false and the endpoint returns JSON metadata including a presigned_url, object_key, filename, file_size, and conversion_time_seconds.