Sign, seal and timestamp your documents with a single API call.

cURL

curl https://api.docacert.com/v1/seals \
  -H "Authorization: Bearer $DOCACERT_API_KEY" \
  -F "file=@invoice-2026-0418.pdf" \
  -F "timestamp=true"

Node.js

import { openAsBlob } from "node:fs";

const form = new FormData();
form.append("file", await openAsBlob("invoice-2026-0418.pdf"), "invoice-2026-0418.pdf");
form.append("timestamp", "true");

const res = await fetch("https://api.docacert.com/v1/seals", {
  method: "POST",
  headers: { Authorization: `Bearer ${process.env.DOCACERT_API_KEY}` },
  body: form,
});
const seal = await res.json();

Python

import os
import requests

with open("invoice-2026-0418.pdf", "rb") as f:
    res = requests.post(
        "https://api.docacert.com/v1/seals",
        headers={"Authorization": f"Bearer {os.environ['DOCACERT_API_KEY']}"},
        files={"file": f},
        data={"timestamp": "true"},
    )

seal = res.json()

C#

using var http = new HttpClient();
http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
    "Bearer", Environment.GetEnvironmentVariable("DOCACERT_API_KEY"));

using var form = new MultipartFormDataContent
{
    { new StreamContent(File.OpenRead("invoice-2026-0418.pdf")), "file", "invoice-2026-0418.pdf" },
    { new StringContent("true"), "timestamp" }
};

var res = await http.PostAsync("https://api.docacert.com/v1/seals", form);
var seal = await res.Content.ReadFromJsonAsync<Seal>();