OTS to PDF API#

The OTS to PDF API converts OpenDocument Spreadsheet Template files (.ots) to PDF through the POST /v1/convert/ots-to-pdf endpoint. OTS is the spreadsheet template format of LibreOffice and OpenOffice Calc. Upload an .ots file as multipart/form-data and receive raw PDF bytes back, or set direct_download=false to get JSON metadata with a presigned download URL. Rendering is handled server-side by LibreOffice, so the template's own formatting, fonts, and layout are preserved in the PDF output.

Endpoint#

POST /v1/convert/ots-to-pdf

Content-Type: multipart/form-data

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

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

Node.js#

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

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

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

PHP#

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

Go#

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

req, _ := http.NewRequest("POST", "https://api.enconvert.com/v1/convert/ots-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.ots", "rb") as f:
    response = requests.post(
        "https://api.enconvert.com/v1/convert/ots-to-pdf",
        headers={"X-API-Key": "sk_your_private_key"},
        files={"file": ("document.ots", f)},
        data={"pdf_options": json.dumps({"grayscale": True})}
    )

Error Responses#

Limits#

Frequently asked questions#

How do I convert an OTS spreadsheet template to PDF with a REST API?#

Send a POST request to /v1/convert/ots-to-pdf with the .ots file in a multipart/form-data body, authenticated with an X-API-Key header or an Authorization: Bearer JWT. The response contains the converted PDF bytes by default.

Can I convert LibreOffice or OpenOffice Calc template files to PDF with this API?#

Yes. The endpoint accepts .ots files, the OpenDocument Spreadsheet Template format used by LibreOffice and OpenOffice Calc, and renders them server-side with LibreOffice so the output matches how the document would print from LibreOffice.

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

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

Can I change the page size, margins, or orientation of the PDF output?#

No. Page layout is taken from the OTS document's own settings; the only supported pdf_options field is grayscale. To change the layout, modify the source document before uploading.

Why does the ots-to-pdf endpoint return 400 Bad Request?#

A 400 Bad Request is returned when the upload is not an .ots file, when the document is corrupt or unsupported, or when the pdf_options value is not valid JSON.