# Estrarre pagine da un PDF

Creare un nuovo PDF da una selezione di pagine di un PDF esistente.

Estrarre una o più pagine da un PDF in un nuovo documento. Selezionare le
pagine con il parametro [`pages`](#selezionare-le-pagine). Se viene omesso,
vengono estratte tutte le pagine e il risultato le mantiene sempre nell’ordine
del documento. L’API è *stateless*: il documento viene elaborato nella sua
regione e non viene mai memorizzato.

## Endpoint

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

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

## 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>
  Il documento PDF di input.
</ParamField>

<ParamField name="pages" type="string">
  Le pagine da estrarre, scritte come un [intervallo di
  pagine](#selezionare-le-pagine), ad esempio `1..3,5`. Se viene omesso,
  vengono estratte tutte le pagine. Massimo 1000 caratteri.
</ParamField>

### Selezionare le pagine

Il parametro `pages` accetta un elenco di numeri di pagina in base 1 e di
intervalli, separati da virgole. Viene trattato come un **insieme**: l’ordine e
i duplicati sono ignorati e le pagine estratte restano sempre nell’ordine del
documento. Per riorganizzare le pagine in un ordine arbitrario, usare invece
[Riordinare le pagine](/docs/api/reorder-pages-of-pdf).

| Schema      | Seleziona                                  |
| ----------- | ------------------------------------------ |
| *(omesso)*  | Tutte le pagine                            |
| `1`         | Solo la prima pagina                       |
| `1..3,5`    | Le pagine 1, 2, 3 e 5                      |
| `2..`       | Dalla pagina 2 all’ultima pagina           |
| `..-2`      | Dalla prima pagina alla penultima          |
| `-1`        | L’ultima pagina                            |

Vedere [Selezionare le pagine](/docs/api/selecting-pages) per il riferimento
completo.

## Esempi

Estrarre le pagine da 1 a 3 e la pagina 5 in un nuovo PDF:

<CodeGroup>

```bash title="cURL"
curl https://api.pdfblocks.com/v1/extract_pages \
  -H 'X-API-Key: your_api_key' \
  -F file=@input.pdf \
  -F pages='1..3,5' \
  -o extracted.pdf
```

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

with open('input.pdf', 'rb') as file:
    response = requests.post(
        'https://api.pdfblocks.com/v1/extract_pages',
        headers={'X-API-Key': 'your_api_key'},
        files={'file': file},
        data={'pages': '1..3,5'},
    )

response.raise_for_status()
with open('extracted.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.set('file', new Blob([await readFile('input.pdf')]), 'input.pdf');
body.set('pages', '1..3,5');

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

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

```php title="PHP"
<?php
$ch = curl_init('https://api.pdfblocks.com/v1/extract_pages');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['X-API-Key: your_api_key'],
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => [
        'file' => new CURLFile('input.pdf', 'application/pdf'),
        'pages' => '1..3,5',
    ],
]);

$pdf = curl_exec($ch);
if (curl_getinfo($ch, CURLINFO_HTTP_CODE) === 200) {
    file_put_contents('extracted.pdf', $pdf);
}
```

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

response = HTTP
  .headers('X-API-Key' => 'your_api_key')
  .post('https://api.pdfblocks.com/v1/extract_pages', form: {
    file: HTTP::FormData::File.new('input.pdf'),
    pages: '1..3,5',
  })

File.write('extracted.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)

	file, _ := os.Open("input.pdf")
	defer file.Close()
	part, _ := form.CreateFormFile("file", "input.pdf")
	io.Copy(part, file)

	form.WriteField("pages", "1..3,5")
	form.Close()

	req, _ := http.NewRequest("POST", "https://api.pdfblocks.com/v1/extract_pages", &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("extracted.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("input.pdf")), "file", "input.pdf" },
    { new StringContent("1..3,5"), "pages" },
};

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

</CodeGroup>

## Risposta

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

```http
HTTP/1.1 200 OK
Content-Type: application/pdf
Content-Length: 22841
```

L’output contiene solo le pagine selezionate, nell’ordine del documento.
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 `pages`
fa riferimento a una pagina che non esiste nel documento o quando `file` non è
un PDF leggibile. L’oggetto `errors` nomina ogni campo:

```json
{
  "type": "https://www.pdfblocks.com/docs/api/v1/error/400",
  "title": "One or more validation errors occurred.",
  "status": 400,
  "errors": {
    "pages": ["The pages field references a page that does not exist in the document."]
  }
}
```

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="Estrarre una sola pagina">

<CodeGroup>

```bash title="cURL"
curl https://api.pdfblocks.com/v1/extract_pages \
  -H 'X-API-Key: your_api_key' \
  -F file=@input.pdf \
  -F pages='1' \
  -o page-1.pdf
```

```python title="Python"
import requests

with open('input.pdf', 'rb') as file:
    response = requests.post(
        'https://api.pdfblocks.com/v1/extract_pages',
        headers={'X-API-Key': 'your_api_key'},
        files={'file': file},
        data={'pages': '1'},
    )

response.raise_for_status()
with open('page-1.pdf', 'wb') as output:
    output.write(response.content)
```

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

const body = new FormData();
body.set('file', new Blob([await readFile('input.pdf')]), 'input.pdf');
body.set('pages', '1');

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

if (!response.ok) throw new Error(`Request failed: ${response.status}`);
await writeFile('page-1.pdf', Buffer.from(await response.arrayBuffer()));
```

```php title="PHP"
<?php
$ch = curl_init('https://api.pdfblocks.com/v1/extract_pages');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['X-API-Key: your_api_key'],
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => [
        'file' => new CURLFile('input.pdf', 'application/pdf'),
        'pages' => '1',
    ],
]);

$pdf = curl_exec($ch);
if (curl_getinfo($ch, CURLINFO_HTTP_CODE) === 200) {
    file_put_contents('page-1.pdf', $pdf);
}
```

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

response = HTTP
  .headers('X-API-Key' => 'your_api_key')
  .post('https://api.pdfblocks.com/v1/extract_pages', form: {
    file: HTTP::FormData::File.new('input.pdf'),
    pages: '1',
  })

File.write('page-1.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)

	file, _ := os.Open("input.pdf")
	defer file.Close()
	part, _ := form.CreateFormFile("file", "input.pdf")
	io.Copy(part, file)

	form.WriteField("pages", "1")
	form.Close()

	req, _ := http.NewRequest("POST", "https://api.pdfblocks.com/v1/extract_pages", &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("page-1.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("input.pdf")), "file", "input.pdf" },
    { new StringContent("1"), "pages" },
};

var response = await client.PostAsync(
    "https://api.pdfblocks.com/v1/extract_pages", form);
response.EnsureSuccessStatusCode();
await File.WriteAllBytesAsync(
    "page-1.pdf", await response.Content.ReadAsByteArrayAsync());
```

</CodeGroup>

</Accordion>

<Accordion title="Estrarre le ultime tre pagine">

<CodeGroup>

```bash title="cURL"
curl https://api.pdfblocks.com/v1/extract_pages \
  -H 'X-API-Key: your_api_key' \
  -F file=@input.pdf \
  -F pages='-3..-1' \
  -o last-three.pdf
```

```python title="Python"
import requests

with open('input.pdf', 'rb') as file:
    response = requests.post(
        'https://api.pdfblocks.com/v1/extract_pages',
        headers={'X-API-Key': 'your_api_key'},
        files={'file': file},
        data={'pages': '-3..-1'},
    )

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

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

const body = new FormData();
body.set('file', new Blob([await readFile('input.pdf')]), 'input.pdf');
body.set('pages', '-3..-1');

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

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

```php title="PHP"
<?php
$ch = curl_init('https://api.pdfblocks.com/v1/extract_pages');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['X-API-Key: your_api_key'],
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => [
        'file' => new CURLFile('input.pdf', 'application/pdf'),
        'pages' => '-3..-1',
    ],
]);

$pdf = curl_exec($ch);
if (curl_getinfo($ch, CURLINFO_HTTP_CODE) === 200) {
    file_put_contents('last-three.pdf', $pdf);
}
```

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

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

File.write('last-three.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)

	file, _ := os.Open("input.pdf")
	defer file.Close()
	part, _ := form.CreateFormFile("file", "input.pdf")
	io.Copy(part, file)

	form.WriteField("pages", "-3..-1")
	form.Close()

	req, _ := http.NewRequest("POST", "https://api.pdfblocks.com/v1/extract_pages", &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("last-three.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("input.pdf")), "file", "input.pdf" },
    { new StringContent("-3..-1"), "pages" },
};

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

</CodeGroup>

</Accordion>

</AccordionGroup>

## Azioni correlate

<CardGroup cols={2}>

<Card title="Rimuovere pagine" href="/docs/api/remove-pages-from-pdf">
  Scartare le pagine invece di conservarle.
</Card>

<Card title="Riordinare le pagine" href="/docs/api/reorder-pages-of-pdf">
  Estrarre e riordinare in un’unica chiamata.
</Card>

<Card title="Dividere a una pagina" href="/docs/api/split-pdf-at-page">
  Dividere in due documenti in un punto di taglio.
</Card>

<Card title="Unire documenti" href="/docs/api/merge-pdf-documents">
  Combinare le pagine estratte con altre.
</Card>

</CardGroup>