> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/core/low-level-pdf-api/add-custom.md).

# Information dictionary: adding custom data to a PDF on Server/Desktop

Learn how to add custom data to existing PDF documents using the Cos/SDF low-level API. Get a full code sample demonstrating how to edit PDF files efficiently. The Apryse Server SDK streamlines secure

To add custom data to an existing document.

{% tabs %}
{% tab title="C#" %}
{% code lineNumbers="true" %}

```csharp
// In case you have PDFDoc you can always access
// SDF/Cos document using PDFDoc.GetSDFDoc() method
SDFDoc doc = new SDFDoc(filename);
Obj trailer = doc.GetTrailer();	// Get the trailer

// Create an Info dictionary
Obj info = trailer.PutDict("Info");
info.PutString("Producer", "Apryse PDFNet");

// Create a custom inline dictionary within Info dictionary
Obj custom_dict = info.PutDict("My Direct Dict");
custom_dict.PutNumber("My Number", 100);
```

{% endcode %}
{% endtab %}

{% tab title="C++" %}
{% code lineNumbers="true" %}

```cpp
// In case you have PDFDoc you can always access
// SDF/Cos document using PDFDoc.GetSDFDoc() method
SDFDoc doc(filename);
Obj trailer = doc.GetTrailer();	// Get the trailer

// Create an Info dictionary
Obj info = trailer.PutDict("Info");
info.PutString("Producer", "Apryse PDFNet");

// Create a custom inline dictionary within Info dictionary
Obj custom_dict = info.PutDict("My Direct Dict");
custom_dict.PutNumber("My Number", 100);
```

{% endcode %}
{% endtab %}

{% tab title="Go" %}
{% code lineNumbers="true" %}

```go
// In case you have PDFDoc you can always access
// SDF/Cos document using PDFDoc.GetSDFDoc() method
doc := NewSDFDoc(filename)
trailer := doc.GetTrailer()  // Get the trailer

// Create an Info dictionary
info = trailer.PutDict("Info")
info.PutString("Producer", "Apryse PDFNet")

// Create a custom inline dictionary within Info dictionary
customDict := info.PutDict("My Direct Dict")
customDict.PutNumber("My Number", 100)     // Add some key/value pairs
```

{% endcode %}
{% endtab %}

{% tab title="Java" %}
{% code lineNumbers="true" %}

```java
// In case you have PDFDoc you can always access
// SDF/Cos document using PDFDoc.GetSDFDoc() method
SDFDoc doc = new SDFDoc(filename);
Obj trailer = doc.getTrailer(); // Get the trailer

// Create an Info dictionary
Obj info = trailer.putDict("Info");
info.putString("Producer", "Apryse PDFNet");

// Create a custom inline dictionary within Info dictionary
Obj custom_dict = info.putDict("My Direct Dict");
custom_dict.putNumber("My Number", 100);
```

{% endcode %}
{% endtab %}

{% tab title="JavaScript" %}
{% code lineNumbers="true" %}

```js
async function main() {
  // In case you have PDFDoc you can always access
  // SDF/Cos document using PDFDoc.GetSDFDoc() method
  const pdf_doc = await PDFNet.PDFDoc.createFromURL(filename);
  const doc =  await pdf_doc.getSDFDoc();
  const trailer = await doc.getTrailer(); // Get the trailer

  // Create an Info dictionary
  const info = await trailer.putDict('Info');
  info.putString('Producer', 'Apryse PDFNet');

  // Create a custom inline dictionary within Infor dictionary
  const customDict = await info.putDict('My Direct Dict');
  customDict.putNumber('My Number', 100);
}
PDFNet.runWithCleanup(main);
```

{% endcode %}
{% endtab %}

{% tab title="Kotlin" %}
{% code lineNumbers="true" %}

```kotlin
// In case you have PDFDoc you can always access
// SDF/Cos document using PDFDoc.GetSDFDoc() method
val doc = SDFDoc(filename)
val trailer = doc.trailer  // Get the trailer

// Create an Info dictionary
val info = trailer.putDict("Info")
info.putString("Producer", "Apryse PDFNet")

// Create a custom inline dictionary within Info dictionary
val custom_dict = info.putDict("My Direct Dict")
custom_dict.putNumber("My Number", 100.0)
```

{% endcode %}
{% endtab %}

{% tab title="Obj-C" %}
{% code lineNumbers="true" %}

```objc
// In case you have PDFDoc you can always access
// SDF/Cos document using PDFDoc.GetSDFDoc() method
PTSDFDoc *doc = [[PTSDFDoc alloc] initWithFilepath: filename];
PTObj *trailer = [doc GetTrailer];  // Get the trailer

// Create an Info dictionary
PTObj *info = [trailer PutDict: @"Info"];
[info PutString: @"Producer" value: @"Apryse PDFNet"];

// Create a custom inline dictionary within Info dictionary
PTObj * custom_dict = [info PutDict: @"My Direct Dict"];
[custom_dict PutNumber: @"My Number" value: 100];
```

{% endcode %}
{% endtab %}

{% tab title="Swift" %}
{% code lineNumbers="true" %}

```swift
// In case you have PDFDoc you can always access
// SDF/Cos document using PDFDoc.GetSDFDoc() method
let doc: PTSDFDoc = PTSDFDoc(filepath: filename, ofType: "pdf")
let trailer: PTObj = doc.getTrailer()  // Get the trailer

// Create an Info dictionary
let info = trailer.putDict("Info")
info.put("Producer", value: "Apryse PDFNet")

// Create a custom inline dictionary within Info dictionary
let custom_dict: PTObj = info.putDict("My Direct Dict")
custom_dict.putNumber("My Number", value: 100)
```

{% endcode %}
{% endtab %}

{% tab title="PHP" %}
{% code lineNumbers="true" %}

```php
// In case you have PDFDoc you can always access
// SDF/Cos document using PDFDoc.GetSDFDoc() method
$doc = new SDFDoc($filename);
$trailer = $doc->GetTrailer(); // Get the trailer

// Create an Info dictionary
$info = $trailer->PutDict("Info");
$info->PutString("Producer", "Apryse PDFNet");

// Create a custom inline dictionary within Info dictionary
$custom_dict = $info->PutDict("My Direct Dict");
$custom_dict->PutNumber("My Number", 100);
```

{% endcode %}
{% endtab %}

{% tab title="Python" %}
{% code lineNumbers="true" %}

```python
# In case you have PDFDoc you can always access
# SDF/Cos document using PDFDoc.GetSDFDoc() method
doc = SDFDoc(filename)
trailer = doc.GetTrailer()  # Get the trailer

# Create an Info dictionary
info = trailer.PutDict("Info")
info.PutString("Producer", "Apryse PDFNet")

# Create a custom inline dictionary within Info dictionary
custom_dict = info.PutDict("My Direct Dict")
custom_dict.PutNumber("My Number", 100)
```

{% endcode %}
{% endtab %}

{% tab title="Ruby" %}
{% code lineNumbers="true" %}

```ruby
# In case you have PDFDoc you can always access
# SDF/Cos document using PDFDoc.GetSDFDoc() method
doc = SDFDoc.new(filename)
trailer = doc.GetTrailer  # Get the trailer

# Create an Info dictionary
info = trailer.PutDict("Info")
info.PutString("Producer", "Apryse PDFNet")

# Create a custom inline dictionary within Info dictionary
custom_dict = info.PutDict("My Direct Dict")
custom_dict.PutNumber("My Number", 100)
```

{% endcode %}
{% endtab %}

{% tab title="VB" %}
{% code lineNumbers="true" %}

```vb
' In case you have PDFDoc you can always access
' SDF/Cos document using PDFDoc.GetSDFDoc() method
Dim doc As SDFDoc = New SDFDoc(filename)
Dim trailer As Obj = doc.GetTrailer()		   ' Get the trailer

' Create an Info dictionary
info = trailer.PutDict("Info")
info.PutString("Producer", "Apryse PDFNet")

' Create a custom inline dictionary within Info dictionary
Dim custom_dict As Obj = info.PutDict("My Direct Dict")
custom_dict.PutNumber("My Number", 100)
```

{% endcode %}
{% endtab %}
{% endtabs %}

[Cos/SDF low-level API to edit PDF files - Full Sample](/core/get-started/samples/sdftest.md) Full code sample which illustrates how to use basic Cos/SDF API to edit an existing document. Samples available in Python, C# (.Net), C++, Go, Java, Node.js (JavaScript), PHP, Ruby, VB. To use this code, you'll need to [download and get started with Server SDK](/core/get-started/get-started.md).


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