# Unire documenti PDF

Combinare più documenti PDF in uno solo, nell’ordine in cui vengono forniti.

Combinare più documenti PDF in uno solo. I file vengono uniti esattamente
nell’ordine in cui compaiono nella richiesta, così si controlla la sequenza
finale delle pagine. In una sola chiamata è possibile inviare tutti i file
necessari. L’API è *stateless*: il documento viene elaborato nella regione e non
viene mai memorizzato.

## Endpoint

<Endpoint method="POST" path="/v1/merge_documents" />

Disponibile in tutte le regioni. Vedere [Regioni e residenza dei
dati](/docs/api/regions-and-data-residency) per il routing e la residenza dei
dati.

| Regione            | URL                                                  |
| ------------------ | ---------------------------------------------------- |
| Globale            | `https://api.pdfblocks.com/v1/merge_documents`       |
| Stati Uniti        | `https://us.api.pdfblocks.com/v1/merge_documents`    |
| HIPAA Stati Uniti  | `https://hipaa.api.pdfblocks.com/v1/merge_documents` |
| Unione europea     | `https://eu.api.pdfblocks.com/v1/merge_documents`    |
| Regno Unito        | `https://uk.api.pdfblocks.com/v1/merge_documents`    |
| Canada             | `https://ca.api.pdfblocks.com/v1/merge_documents`    |
| Australia          | `https://au.api.pdfblocks.com/v1/merge_documents`    |
| Giappone           | `https://jp.api.pdfblocks.com/v1/merge_documents`    |
| India              | `https://in.api.pdfblocks.com/v1/merge_documents`    |
| Brasile            | `https://br.api.pdfblocks.com/v1/merge_documents`    |

## Autenticazione

Autenticare ogni richiesta con la chiave API segreta nell’intestazione
`X-API-Key`, tramite HTTPS. Le chiavi si creano e si gestiscono dalla
[dashboard](https://dashboard.pdfblocks.com). Vedere
[Autenticazione](/docs/api/authentication) per i dettagli.

## Richiesta

L’endpoint accetta un corpo della richiesta `multipart/form-data`.

<ParamField name="file" type="file[]" required>
  I documenti PDF di input, inviati come parti `file` ripetute. Fornirne almeno
  uno; in una sola richiesta è possibile inviare tutti i file necessari. I
  documenti vengono uniti esattamente nell’ordine in cui le parti compaiono
  nella richiesta. Vedere [Lavorare con i
  file](/docs/api/working-with-files) per sapere come inviare più parti `file`.
</ParamField>

## Esempi

Unire tre PDF in uno solo, in ordine:

<CodeGroup>

```bash title="cURL"
curl https://api.pdfblocks.com/v1/merge_documents \
  -H 'X-API-Key: your_api_key' \
  -F file=@chapter-1.pdf \
  -F file=@chapter-2.pdf \
  -F file=@chapter-3.pdf \
  -o merged.pdf
```

```python title="Python"
# pip install requests
import requests

files = [
    ('file', open('chapter-1.pdf', 'rb')),
    ('file', open('chapter-2.pdf', 'rb')),
    ('file', open('chapter-3.pdf', 'rb')),
]

response = requests.post(
    'https://api.pdfblocks.com/v1/merge_documents',
    headers={'X-API-Key': 'your_api_key'},
    files=files,
)

response.raise_for_status()
with open('merged.pdf', 'wb') as output:
    output.write(response.content)
```

```javascript title="Node.js"
// Node.js 18+
import { readFile, writeFile } from 'node:fs/promises';

const body = new FormData();
body.append('file', new Blob([await readFile('chapter-1.pdf')]), 'chapter-1.pdf');
body.append('file', new Blob([await readFile('chapter-2.pdf')]), 'chapter-2.pdf');
body.append('file', new Blob([await readFile('chapter-3.pdf')]), 'chapter-3.pdf');

const response = await fetch('https://api.pdfblocks.com/v1/merge_documents', {
  method: 'POST',
  headers: { 'X-API-Key': 'your_api_key' },
  body,
});

if (!response.ok) throw new Error(`Request failed: ${response.status}`);
await writeFile('merged.pdf', Buffer.from(await response.arrayBuffer()));
```

```php title="PHP"
<?php
// composer require guzzlehttp/guzzle
require 'vendor/autoload.php';

use GuzzleHttp\Client;

// Repeat the `file` part once per document: they merge in the order sent.
$response = (new Client())->post('https://api.pdfblocks.com/v1/merge_documents', [
    'headers' => ['X-API-Key' => 'your_api_key'],
    'multipart' => [
        ['name' => 'file', 'contents' => fopen('chapter-1.pdf', 'r'), 'filename' => 'chapter-1.pdf'],
        ['name' => 'file', 'contents' => fopen('chapter-2.pdf', 'r'), 'filename' => 'chapter-2.pdf'],
        ['name' => 'file', 'contents' => fopen('chapter-3.pdf', 'r'), 'filename' => 'chapter-3.pdf'],
    ],
]);

if ($response->getStatusCode() === 200) {
    file_put_contents('merged.pdf', $response->getBody());
}
```

```ruby title="Ruby"
# gem install http
require 'http'

response = HTTP
  .headers('X-API-Key' => 'your_api_key')
  .post('https://api.pdfblocks.com/v1/merge_documents', form: {
    file: [
      HTTP::FormData::File.new('chapter-1.pdf'),
      HTTP::FormData::File.new('chapter-2.pdf'),
      HTTP::FormData::File.new('chapter-3.pdf'),
    ],
  })

File.write('merged.pdf', response.body) if response.status.success?
```

```go title="Go"
package main

import (
	"bytes"
	"io"
	"mime/multipart"
	"net/http"
	"os"
)

func main() {
	var buf bytes.Buffer
	form := multipart.NewWriter(&buf)

	for _, name := range []string{"chapter-1.pdf", "chapter-2.pdf", "chapter-3.pdf"} {
		file, _ := os.Open(name)
		part, _ := form.CreateFormFile("file", name)
		io.Copy(part, file)
		file.Close()
	}
	form.Close()

	req, _ := http.NewRequest("POST", "https://api.pdfblocks.com/v1/merge_documents", &buf)
	req.Header.Set("Content-Type", form.FormDataContentType())
	req.Header.Set("X-API-Key", "your_api_key")

	res, _ := http.DefaultClient.Do(req)
	defer res.Body.Close()

	out, _ := os.Create("merged.pdf")
	defer out.Close()
	io.Copy(out, res.Body)
}
```

```csharp title="C#"
using var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-API-Key", "your_api_key");

using var form = new MultipartFormDataContent
{
    { new ByteArrayContent(File.ReadAllBytes("chapter-1.pdf")), "file", "chapter-1.pdf" },
    { new ByteArrayContent(File.ReadAllBytes("chapter-2.pdf")), "file", "chapter-2.pdf" },
    { new ByteArrayContent(File.ReadAllBytes("chapter-3.pdf")), "file", "chapter-3.pdf" },
};

var response = await client.PostAsync(
    "https://api.pdfblocks.com/v1/merge_documents", form);
response.EnsureSuccessStatusCode();
await File.WriteAllBytesAsync(
    "merged.pdf", await response.Content.ReadAsByteArrayAsync());
```

</CodeGroup>

## Risposta

In caso di successo, la risposta è `200 OK` e il corpo contiene il PDF unito:

```http
HTTP/1.1 200 OK
Content-Type: application/pdf
Content-Length: 96124
```

L’output è un unico PDF il cui numero di pagine è la somma delle pagine dei
documenti di input, disposte nell’ordine della richiesta. Scrivere il corpo
direttamente in un file, come fanno gli esempi qui sopra; dalla nostra parte non
viene memorizzato nulla.

## Errori

Le richieste non riuscite restituiscono un corpo `application/problem+json`.
L’errore più frequente su questo endpoint è un `400`, restituito quando una
delle parti `file` non è un PDF leggibile. L’oggetto `errors` nomina il campo:

```json
{
  "type": "https://www.pdfblocks.com/docs/api/v1/error/400",
  "title": "One or more validation errors occurred.",
  "status": 400,
  "errors": {
    "file": ["Could not parse the PDF document. The file may be invalid or corrupt."]
  }
}
```

Una `X-API-Key` assente o non valida restituisce un `401`. Vedere
[Errori](/docs/api/errors) per tutti i codici di stato e la forma completa della
risposta.

## Ricette

Varianti comuni. Espanderne una per vederla in tutti i linguaggi.

<AccordionGroup>

<Accordion title="Anteporre una pagina di copertina a un report">

<CodeGroup>

```bash title="cURL"
curl https://api.pdfblocks.com/v1/merge_documents \
  -H 'X-API-Key: your_api_key' \
  -F file=@cover.pdf \
  -F file=@report.pdf \
  -o report-with-cover.pdf
```

```python title="Python"
import requests

files = [
    ('file', open('cover.pdf', 'rb')),
    ('file', open('report.pdf', 'rb')),
]

response = requests.post(
    'https://api.pdfblocks.com/v1/merge_documents',
    headers={'X-API-Key': 'your_api_key'},
    files=files,
)

response.raise_for_status()
with open('report-with-cover.pdf', 'wb') as output:
    output.write(response.content)
```

```javascript title="Node.js"
import { readFile, writeFile } from 'node:fs/promises';

const body = new FormData();
body.append('file', new Blob([await readFile('cover.pdf')]), 'cover.pdf');
body.append('file', new Blob([await readFile('report.pdf')]), 'report.pdf');

const response = await fetch('https://api.pdfblocks.com/v1/merge_documents', {
  method: 'POST',
  headers: { 'X-API-Key': 'your_api_key' },
  body,
});

if (!response.ok) throw new Error(`Request failed: ${response.status}`);
await writeFile('report-with-cover.pdf', Buffer.from(await response.arrayBuffer()));
```

```php title="PHP"
<?php
// composer require guzzlehttp/guzzle
require 'vendor/autoload.php';

use GuzzleHttp\Client;

$response = (new Client())->post('https://api.pdfblocks.com/v1/merge_documents', [
    'headers' => ['X-API-Key' => 'your_api_key'],
    'multipart' => [
        ['name' => 'file', 'contents' => fopen('cover.pdf', 'r'), 'filename' => 'cover.pdf'],
        ['name' => 'file', 'contents' => fopen('report.pdf', 'r'), 'filename' => 'report.pdf'],
    ],
]);

if ($response->getStatusCode() === 200) {
    file_put_contents('report-with-cover.pdf', $response->getBody());
}
```

```ruby title="Ruby"
require 'http'

response = HTTP
  .headers('X-API-Key' => 'your_api_key')
  .post('https://api.pdfblocks.com/v1/merge_documents', form: {
    file: [
      HTTP::FormData::File.new('cover.pdf'),
      HTTP::FormData::File.new('report.pdf'),
    ],
  })

File.write('report-with-cover.pdf', response.body) if response.status.success?
```

```go title="Go"
package main

import (
	"bytes"
	"io"
	"mime/multipart"
	"net/http"
	"os"
)

func main() {
	var buf bytes.Buffer
	form := multipart.NewWriter(&buf)

	for _, name := range []string{"cover.pdf", "report.pdf"} {
		file, _ := os.Open(name)
		part, _ := form.CreateFormFile("file", name)
		io.Copy(part, file)
		file.Close()
	}
	form.Close()

	req, _ := http.NewRequest("POST", "https://api.pdfblocks.com/v1/merge_documents", &buf)
	req.Header.Set("Content-Type", form.FormDataContentType())
	req.Header.Set("X-API-Key", "your_api_key")

	res, _ := http.DefaultClient.Do(req)
	defer res.Body.Close()

	out, _ := os.Create("report-with-cover.pdf")
	defer out.Close()
	io.Copy(out, res.Body)
}
```

```csharp title="C#"
using var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-API-Key", "your_api_key");

using var form = new MultipartFormDataContent
{
    { new ByteArrayContent(File.ReadAllBytes("cover.pdf")), "file", "cover.pdf" },
    { new ByteArrayContent(File.ReadAllBytes("report.pdf")), "file", "report.pdf" },
};

var response = await client.PostAsync(
    "https://api.pdfblocks.com/v1/merge_documents", form);
response.EnsureSuccessStatusCode();
await File.WriteAllBytesAsync(
    "report-with-cover.pdf", await response.Content.ReadAsByteArrayAsync());
```

</CodeGroup>

</Accordion>

</AccordionGroup>

## Azioni correlate

<CardGroup cols={2}>

<Card title="Estrarre pagine" href="/docs/api/extract-pages-from-pdf">
  Estrarre un sottoinsieme di pagine dal file unito.
</Card>

<Card title="Riordinare le pagine" href="/docs/api/reorder-pages-of-pdf">
  Riorganizzare le pagine dopo l’unione.
</Card>

<Card title="Dividere a una pagina" href="/docs/api/split-pdf-at-page">
  Separare di nuovo il documento combinato.
</Card>

<Card title="Aggiungere una filigrana di testo" href="/docs/api/add-text-watermark-to-pdf">
  Apporre una filigrana sul documento unito.
</Card>

</CardGroup>