Sign PDF in Make

Sign PDF is a Make module by PDF4me that places an image-based signature onto PDF pages inside any Make scenario. Use it when you need to apply a scanned signature, approval stamp, or authorized mark to contracts, invoices, certificates, or official letters on a trigger. The module takes a PDF and a signature image buffer, positions the signature with pixel-level control, and returns the signed PDF ready to distribute.

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Authenticating Your API Request

To access the PDF4me Web API through Make, every request must include proper authentication credentials. Authentication ensures secure communication and validates your identity as an authorized user, enabling seamless integration between your Make scenarios and PDF4me's signature services.

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Important Facts You Should Not Miss

Use PNG with transparent background for clean signature placement

A PNG signature image with a transparent background blends directly over the PDF content without a white or colored box around it. JPEG images introduce a solid background that covers the PDF text beneath the signature area. Store your signature PNG in Google Drive or Dropbox and download it in the module before the Sign PDF step.

Pages accepts text values: last, first, and all

The Pages field accepts the text values last, first, and all in addition to numeric 0-based indices and ranges. Setting it to last is the standard configuration for contract and invoice signing where the signature goes on the final page.

Set width or height to 0 for automatic aspect-ratio sizing

Set Image Width in MM to your target width and Image Height in MM to 0 to let PDF4me scale the height automatically while preserving the original signature aspect ratio. This prevents a stretched or squashed signature image in the output PDF.

Set Horizontal Alignment to Right and Vertical Alignment to Bottom with a 15mm margin to place the signature in the standard bottom-right signing position. Set Pages to last for contract workflows.

How Do I Sign a PDF in Make Automatically?

The PDF4me Sign PDF module connects to any Make trigger that delivers a PDF and a signature image. Most workflows download both files from cloud storage before the Sign PDF step: one download module retrieves the document, another retrieves the stored signature PNG. According to the Make integration documentation, all PDF4me modules share the same connection, so you can stack a watermark, OCR, and sign step in a single Make scenario without additional authentication setup. Set Pages to last, Horizontal Alignment to Right, and Vertical Alignment to Bottom with a 15mm margin for the standard bottom-right contract signature position.

Parameters

Important: Parameters marked Required must be provided. Conditional parameters have a built-in default when omitted.

Parameter	Required	What it does	Example
Connection	Required	PDF4me connection holding your API key. Create one from the Make Connections panel.	My PDF4me connection
PDF File Name	Required	Source PDF filename with .pdf extension. Drives the output signed PDF filename. Map from a prior download module.	contract.pdf
PDF File	Required	Binary PDF content as a Make buffer. Map from Google Drive, Dropbox, OneDrive, or HTTP download module.	1. Data
Image Name	Required	Filename of the signature image including extension. PNG recommended for transparent background signatures.	signature.png
Image File	Required	Binary signature image as a Make buffer. Map from a cloud-storage download module where your signature PNG is stored.	1. Data
Horizontal Alignment	Required	Horizontal anchor point for the signature: Left, Center, or Right. Combined with Horizontal Margin for precise positioning.	Right
Vertical Alignment	Required	Vertical anchor point for the signature: Top, Middle, or Bottom. Combined with Vertical Margin for precise positioning.	Bottom
Image Width in MM	Required	Signature width in millimeters (max 500mm). Set to 0 to auto-scale based on Image Height while preserving aspect ratio.	50
Image Height in MM	Required	Signature height in millimeters (max 500mm). Set to 0 to auto-scale based on Image Width while preserving aspect ratio.	0
Horizontal Margin in MM	Conditional	Offset from the horizontal page edge in millimeters. Ignored when Horizontal Alignment is Center. Use 10-20mm to keep the signature away from the page edge.	15
Vertical Margin in MM	Conditional	Offset from the vertical page edge in millimeters. Ignored when Vertical Alignment is Middle. Use 10-20mm to keep the signature clear of the footer area.	15
Pages	Required	Target pages for the signature. Accepts text values: last, first, all. Also accepts 0-based numeric indices (0,1,2) or ranges (0-4).	last
Transparency	Required	Signature opacity from 0 (fully transparent) to 100 (fully opaque). Use 100 for standard signing. Lower values for subtle approval marks.	100

Output

The PDF4me Sign PDF module returns two fields on the output bundle:

Field	Type	What it contains
Name	String	Output PDF filename with the signature applied. Use in the destination upload module File Name field.
Doc Data	Buffer	Binary signed PDF as a Make buffer. Map into Google Drive Upload, Dropbox Upload, SharePoint Create File, or Email Send attachment.

Scenario Examples

The PDF4me Sign PDF module in Make provides comprehensive scenario templates for signature automation:

Auto Approval

Automated Document Approval Signature Scenario

Transform your approvals with automated signature application:

1. Trigger: Document approved in approval system
2. Get Document and Signature: Download PDF and approver signature PNG from storage
3. Apply Signature: Insert signature on last page, bottom right, 15mm margins
4. Upload Signed: Save to approved documents folder
5. Email Stakeholders: Send signed approval to requester

Business Benefits: Signs 150+ approvals monthly, eliminates manual signature workflow, maintains professional approval documentation.

Create Scenario

Certificate Signing

Automated Certificate Signature Application Scenario

Streamline your credentialing with automated certificate signing:

1. Trigger: Student completes course successfully
2. Generate Certificate: Create certificate PDF with student info
3. Get Director Signature: Download director signature PNG from storage
4. Apply Signature: Insert signature in designated position on last page
5. Email Student: Send signed certificate instantly

Business Benefits: Signs 300+ certificates monthly, enables instant delivery, eliminates physical signing requirements.

Create Scenario

Invoice Signing

Automated Invoice Authorization Signature Scenario

Enhance your billing with automated invoice signature:

1. Trigger: Invoice approved for customer delivery
2. Get Invoice and Signature: Download finalized invoice PDF and finance manager signature
3. Apply Signature: Insert on invoice bottom with Right alignment and 15mm margin
4. Email Customer: Send authorized invoice immediately

Business Benefits: Signs 400+ invoices monthly, provides authorization verification, eliminates manual invoice signing delays.

Create Scenario

Letter Signing

Automated Official Letter Signature Scenario

Optimize your correspondence with automated letter signing:

1. Trigger: Official letter finalized for distribution
2. Get Letter and Signature: Download letter PDF and executive signature PNG
3. Apply Signature: Insert above printed name with precise margin control
4. Email Recipient: Send signed letter, archive copy to correspondence folder

Business Benefits: Signs 80+ official letters monthly, provides consistent signature appearance, eliminates physical signing delays.

Create Scenario

Industry Use Cases & Applications

Legal & Contracts

• Contract Signing: Apply signature images to agreements
• Authorization Documents: Sign authorization forms
• Legal Letters: Add signatures to legal correspondence
• Approval Documents: Sign approval and consent forms

Education & Credentials

• Certificate Signing: Apply institution signatures to certificates
• Transcript Signing: Sign official academic transcripts
• Diploma Signing: Add signatures to diplomas
• Award Letters: Sign scholarship and award notifications

Finance & Accounting

• Invoice Authorization: Sign invoices for authenticity
• Financial Approvals: Apply signatures to financial documents
• Payment Authorizations: Sign payment approval documents
• Expense Approvals: Add authorized signatures to expense reports

Corporate & Business

• Approval Workflows: Sign approved documents automatically
• Executive Letters: Apply executive signatures to correspondence
• Authorization Forms: Sign business authorization documents
• Official Communications: Add signatures to official letters

When Should I Use Sign PDF in Make?

Use Sign PDF when you need to embed an image-based signature or approval mark into a PDF as part of an automated Make workflow. This module applies a visual signature image (scanned handwriting, stamp, or logo) to the PDF. If you need legally binding e-signatures with signer authentication and an audit trail, consider a dedicated e-signature integration in Make alongside this module. For text-based stamps such as APPROVED or CONFIDENTIAL, use the Add Text Watermark module instead. According to the Make PDF4me integration page, you can combine both modules in a single scenario to stamp and sign in one automated flow.

Common Questions

How do I sign a PDF automatically in Make?

Add the PDF4me Sign PDF module after a trigger that delivers both the document PDF and the signature image. Map PDF File Name, PDF File, Image Name, and Image File from prior download modules. Set Pages to last, Horizontal Alignment to Right, Vertical Alignment to Bottom, and Transparency to 100 for a standard contract signature. Map Doc Data from the output into an upload or email module. See PDF4me Make documentation for the full setup guide.

What image format should I use for a signature in Make?

PNG with a transparent background is the recommended format. Transparent PNG ensures the signature overlays cleanly on the PDF content without a white or colored box. JPEG images work but introduce a solid background that obscures the PDF text beneath the signature area. Store your signature PNG in Google Drive or Dropbox and retrieve it with a download module before the Sign PDF step. Keep the signature image at 300 DPI or higher for crisp rendering.

Can I sign only the last page of a PDF in Make?

Yes. Set the Pages parameter to last to apply the signature exclusively to the final page. Use first for page one, all for every page, or numeric 0-based indices and ranges such as 0 for the first page only or 0-2 for the first three pages. This controls which pages receive the signature image without creating additional PDF copies.

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