> ## Documentation Index
> Fetch the complete documentation index at: https://docs.pdf.co/llms.txt
> Use this file to discover all available pages before exploring further.
# Merge PDF
> Add this step to your Zapier Workflow to combine multiple document formats into a single **PDF**. Supported formats include **PDF, DOC, DOCX, XLS, JPG, PNG** and more.
The total combined size of all input file URls must not exceed **2 GB**. Requests that exceed this limit will not be processed.
## Input
| Name | Description | Required |
| --------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | -------- |
| **Source Files URLs** | A comma-separated list of files to merge. If you use a cloud service such as **Google Drive** or **Dropbox** ensure the links are publicly accessible. | Yes |
| **Automatically Convert Non-PDF Files** | Whether to automatically convert non-PDF files to **PDF** before the merging operation. | No |
| **Output File Name** | The output file name. If left blank then the name of the last file in the **Source PDF URL** list will be used. | No |
| **Custom Profiles** | A `JSON` string which adds options for the conversion process. See [Custom Profiles](#custom-profiles) for more. | No |
### Source PDF URL & Google
When using **Google Drive**, it’s typically recommended to choose the **File** option. For more advanced file integration techniques, see [Integrating File Sources with pdf.co](/integrations/zapier/input-file-sources).
## Output
| Name | Description |
| --------------------- | ---------------------------------------------------------------------------------------- |
| `url` | The temporary **URL** on the **PDF.co** file server. |
| `outputLinkValidTill` | A timestamp which indicates how long the `url` will be available for. |
| `error` | Details of any errors (if any). |
| `status` | The [response status](/api-reference/introduction) code. If all good this will be `200`. |
| `name` | The name of the file. |
| `jobId` | The unique identifier for the job. |
| `credits` | The credits spent on the process. |
| `remainingCredits` | The credits left on your account. |
| `duration` | The time it took for the process. |
## Custom profiles
Use Custom [Profiles](/api-reference/profiles) to enhance your workflow with additional processing options. Enter `JSON` configuration to customize OCR settings, output format, text extraction methods, and more.
### Sample JSON
```json theme={null}
{ "ImageOptimizationFormat": "JPEG", "JPEGQuality": 25, "ResampleImages": true, "ResamplingResolution": 120, "GrayscaleImages": true }
```
You can use any regular API parameter from the [API Reference](/api-reference) within Zapier using the `std_params` feature in profiles. The `std_params` enables the definition of regular API parameters in a JSON format, See [Standard Parameters](/api-reference/profiles#standard-parameters) for detailed documentation and examples.
| Parameter | Type | Default | Description |
| --------------------------------- | -------------- | --------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `outputDataFormat` | string | - | If you require your output as base64 format, set this to base64 |
| `RenameMatchingFieldsDuringMerge` | boolean | true | This feature enables the renaming of field names during the merging of PDF files which contain forms. If set to false, it will retain the original field names. This is helpful for merged PDF forms with identical field names when the customer wants to auto-fill the identical field names in other pages. |
| `GenerateBookmarks` | boolean | `false` | This adds bookmarks to the merged document with names assigned to every merged document in the same order: |
| `BookmarkTitles` | array\[string] | - | An array containing the titles/names for bookmarks to be created |
| `zipIncludeFilter` | string | - | You can control which files to include and exclude from input zip files with a profiles. |
| `zipExcludeFilter` | string | - | zipIncludeFilter and zipExcludeFilter support \* and ? wildcards. |
| `MergedDocumentTitle` | string | Title of the first document | Specifies a custom title for the merged document. Overrides the title of the first document during the merge process. |
| `DataEncryptionAlgorithm` | string | - | Controls the encryption algorithm used for data encryption. See User-Controlled Encryption for more information. The available algorithms are: AES128, AES192, AES256. |
| `DataEncryptionKey` | string | - | Controls the encryption key used for data encryption. See User-Controlled Encryption for more information. |
| `DataEncryptionIV` | string | - | Controls the encryption IV used for data encryption. See User-Controlled Encryption for more information. |
| `DataDecryptionAlgorithm` | string | - | Controls the decryption algorithm used for data decryption. See User-Controlled Encryption for more information. The available algorithms are: AES128, AES192, AES256. |
| `DataDecryptionKey` | string | - | Controls the decryption key used for data decryption. See User-Controlled Encryption for more information. |
| `DataDecryptionIV` | string | - | Controls the decryption IV used for data decryption. See User-Controlled Encryption for more information. |