Fill the Form, Drop the Signature. Power Automate Does Both—No Code!

You have a fillable PDF form, data in JSON, and a signature image. Doing it by hand: fill fields, place the signature, save. Power Automate plus PDF4me automates it: get the template, JSON, and signature from Dropbox or SharePoint; run Fill a PDF Form and Sign PDF; then save the signed document. No code. Perfect for contracts, agreements, and forms that must be filled and signed in one flow.

Why-Based Q&A​

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What You'll Get​

Input: A fillable PDF form, a JSON file (or string) with field values, and a signature image file. Output: One PDF with all fields populated and the signature image placed (e.g. on the last page), ready to save or email.

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What You Need​

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The Flow at a Glance​

1. Manually trigger a flow (or When a file is created for automation).
2. Get Template File — Blank fillable PDF form.
3. Get JSON data file — Data to populate the form fields.
4. Get Signature Image — Image file (e.g. PNG) to place on the PDF.
5. PDF4me – Fill a PDF Form — Template + JSON → filled PDF.
6. PDF4me – Sign PDF — Filled PDF + signature image → signed PDF.
7. Create file — Save the signed PDF to your folder.

Complete flow overview​

Seven steps: Trigger, three Get file actions (template, JSON, signature image), Fill a PDF Form, Sign PDF, Create file. The filled PDF from step 5 goes into Sign PDF; the signed PDF from step 6 goes into Create file.

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Step 1: Get the Template File​

Flow so far: Trigger and Get Template File.

1. Add Manually trigger a flow (or When a file is created in Dropbox/SharePoint).
2. Add Dropbox (or SharePoint) → Get file content using path. Name it "Get Template File".
3. File Path — e.g. /blog data/sign and fill pdf/sample_fill_form.pdf.
4. Run the action. File Content will be used as the template in Fill a PDF Form.

Get Template File​

Get Template File: path to your fillable PDF. Output File Content is passed to Fill a PDF Form.

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Step 2: Get the JSON Data File​

Flow so far: Get Template File → Get JSON data file.

1. Add Dropbox (or SharePoint) → Get file content using path. Name it "Get JSON data file".
2. File Path — e.g. /blog data/sign and fill pdf/sample_fill_form_data.json.
3. Run the action. Map this content as Form Data in Fill a PDF Form. If the connector returns base64, use base64ToString(...) to get JSON text.

Get JSON data file​

Get JSON data file: path to JSON. Keys must match the PDF form field names. Content is passed to Fill a PDF Form as Form Data.

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Step 3: Get the Signature Image​

Flow so far: Get Template File → Get JSON data file → Get Signature Image.

1. Add Dropbox (or SharePoint) → Get file content using path. Name it "Get Signature Image".
2. File Path — e.g. /blog data/sign and fill pdf/signature.png. Use PNG or JPG.
3. Run the action. File Content will be passed to Sign PDF as Sign Image.

Get Signature Image​

Get Signature Image: path to your signature image. Output is passed to Sign PDF as Sign Image.

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Step 4: Fill the PDF Form​

Flow so far: Get files → Fill a PDF Form.

1. Add PDF4me → Fill a PDF Form.
2. Template File Data — File Content from Get Template File.
3. Template File Name — e.g. sample_fill_form.pdf.
4. Form Data (Data string) — JSON from Get JSON data file (use expression if content is base64).
5. Keep Pdf template Editable — No for a flattened PDF.
6. Run the action. Output Documents → first item → File Content = filled PDF. Pass this to Sign PDF.

Fill a PDF Form​

Fill a PDF Form: template from step 1, form data from step 2. Output Documents contain the filled PDF for the next action.

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Step 5: Sign the PDF​

Flow so far: Get files → Fill a PDF Form → Sign PDF.

1. Add PDF4me → Sign PDF.
2. File Content — File Content from the first Output Documents item of Fill a PDF Form (e.g. body('Fill_a_PDF_Form')?['OutputDocuments']?[0]?['FileContent']).
3. File Name — e.g. filled_form.pdf (must include .pdf).
4. Sign Image — File Content from Get Signature Image.
5. Pages — e.g. last (or 1, all).
6. Horizontal Alignment / Vertical Alignment — e.g. Right / Bottom.
7. Image Width / Image Height (mm) — e.g. 50 / 20.
8. Horizontal Margin / Vertical Margin (mm) — e.g. 10 / 10.
9. Transparency — e.g. 100 (opaque).
10. Run the action. File Content and File Name = signed PDF for Create file.

Sign PDF​

Sign PDF: filled PDF from step 4, signature image from step 3. Set page, alignment, size, and margins. Output is the signed PDF.

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Step 6: Create the File (Save the Signed PDF)​

Flow so far: Get files → Fill a PDF Form → Sign PDF → Create file.

1. Add Dropbox (or SharePoint) → Create file.
2. Folder Path — e.g. /blog data/sign and fill pdf/output.
3. File Name — e.g. Sign_Fill_PA.pdf.
4. File Content — File Content from the Sign PDF action.
5. Run the flow. The filled, signed PDF is saved.

Create file​

Create file: save the signed PDF from Sign PDF to your output folder.

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Input and Output: What Goes In, What Comes Out​

Input: PDF form and JSON​

Blank fillable form: template for Fill a PDF Form. Field names must match the JSON keys.

JSON data: keys match form fields. Get JSON data file provides this to Fill a PDF Form.

Output: Filled and signed PDF​

Filled and signed PDF: fields populated from JSON and signature image placed (e.g. last page, bottom right). Saved via Create file.

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Use Cases: When to Sign and Fill PDFs in Power Automate​

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Quick Reference: Key Settings​

For details: Fill a PDF Form, Sign PDF — Power Automate.

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Troubleshooting​

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What's Next?​

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