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Generate AI proposals as PDFs with GPT-4, Gmail, Google Drive and Slack

Jitesh DugarJitesh Dugar
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2/3/2026
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πŸ“„ AI Proposal Generator with PDF Delivery & Team Notifications

Description

Creating client proposals manually is slow, repetitive, and often inconsistent. This AI-powered workflow transforms proposal creation from a manual task into a fully automated, professional process.

With a single submission, this workflow generates a customized AI-written proposal, converts it into a polished PDF, emails it to the client, stores it in Google Drive, and notifies your internal team β€” ensuring faster turnaround, consistent quality, and zero missed steps.


What This Workflow Does

This workflow turns client requirements into ready-to-send proposals with minimal effort:

πŸ“ Capture Client & Project Details – A webhook receives client information, project scope, budget range, and timeline.

🧠 AI-Powered Proposal Writing – AI generates a structured, client-ready proposal tailored to the project requirements.

πŸ“„ HTML Proposal Formatting – The proposal content is converted into a clean, professional HTML layout.

πŸ“‘ PDF Generation – The HTML proposal is automatically converted into a downloadable PDF.

πŸ“§ Email Delivery – The proposal PDF is emailed directly to the client.

☁️ Google Drive Storage – A copy of the proposal is saved for record-keeping and reuse.

πŸ’¬ Slack Notification – Your team is notified when a proposal is generated and sent.

πŸ” Webhook Response – Returns a confirmation response for frontend or system integrations.


Key Features

πŸ€– AI Proposal Generation – Automatically creates professional proposals based on project inputs.

βš™οΈ End-to-End Automation – From input submission to PDF delivery, everything runs automatically.

πŸ“„ Professional PDF Output – Client-ready proposals with clean formatting.

πŸ“§ Automated Email Sending – No manual follow-ups required.

☁️ Centralized Storage – All proposals stored securely in Google Drive.

πŸ’¬ Team Notifications – Instant Slack alerts for visibility and tracking.

πŸ”€ Flexible Integration – Can be triggered from forms, CRMs, or web apps.


Perfect For

πŸš€ Freelancers & Consultants – Send proposals faster without writing from scratch.

🏒 Agencies & Service Providers – Standardize proposal quality across teams.

πŸ“ˆ Sales & Operations Teams – Reduce manual work and response time.

πŸ’» Startups & Small Businesses – Look professional without extra overhead.

🧠 Remote Teams – Keep everyone aligned with automated notifications.


What You’ll Need

Required Integrations

🌐 Webhook Trigger – Receives client and project details.

πŸ€– OpenAI – Generates proposal content.

πŸ“„ HTMLCSS to PDF – Converts HTML proposals into PDFs.

πŸ“§ Gmail – Sends proposal emails to clients.

☁️ Google Drive – Stores generated proposal files.

πŸ’¬ Slack – Sends internal notifications.


Optional Enhancements

πŸ“Š CRM Integration – Save proposal data to HubSpot, Airtable, or Salesforce.

🎨 Brand Customization – Add logos, brand colors, and styling to proposals.

🌍 Multilingual Proposals – Generate proposals in different languages.

πŸ” Approval Step – Add internal approval before sending proposals.

πŸ“ˆ Analytics Dashboard – Track proposal volume and turnaround time.

πŸ“Ž File Attachments – Include additional documents with the proposal email.


Quick Start

1️⃣ Import the workflow template into your n8n workspace 2️⃣ Connect credentials for OpenAI, Gmail, Google Drive, Slack, and HTMLCSS to PDF 3️⃣ Send test data to the webhook with client and project details 4️⃣ Review the generated proposal PDF 5️⃣ Activate the workflow and start sending proposals automatically


Customization Options

1️⃣ Proposal Branding – Update HTML layout, fonts, and colors. 2️⃣ AI Prompt Tuning – Adjust tone, length, or structure of proposals. 3️⃣ Email Messaging – Customize email subject and content. 4️⃣ Slack Messages – Modify notification text or channels. 5️⃣ Drive Organization – Change folder structure for stored proposals. 6️⃣ Pricing Logic – Adjust calculations for budget or timeline.


Expected Results

⚑ Faster Proposal Turnaround – Generate proposals in minutes instead of hours.

πŸ€– Consistent Quality – Every proposal follows a structured format.

πŸ“§ Instant Delivery – Clients receive proposals immediately.

πŸ—‚οΈ Organized Records – All proposals stored automatically.

πŸ’¬ Better Team Visibility – Everyone stays informed with Slack alerts.


Workflow Structure Visualization

πŸ“ Webhook Input ↓ 🧠 AI Proposal Generation ↓ πŸ“„ HTML Formatting ↓ πŸ“‘ PDF Conversion ↓ πŸ“§ Email Delivery ↓ ☁️ Google Drive Storage ↓ πŸ’¬ Slack Notification ↓ πŸ” Webhook Response


πŸš€ Ready to Automate Proposal Creation?

Import this template and let AI handle proposal writing, formatting, delivery, and tracking β€” so you can focus on closing deals faster. ✨

Generate AI Proposals as PDFs with GPT-4, Gmail, Google Drive, and Slack

This n8n workflow automates the process of generating AI-powered business proposals, saving them as PDFs in Google Drive, and notifying relevant stakeholders via Gmail and Slack. It leverages the power of OpenAI's GPT-4 for content generation, streamlining a typically time-consuming task.

What it does

This workflow is designed to be triggered manually or by an external system via a webhook. Here's a step-by-step breakdown of its functionality:

  1. Receives Webhook Trigger: The workflow starts by listening for an incoming webhook. This webhook is expected to contain the necessary data to generate a proposal (e.g., client name, project details, proposal type).
  2. Generates Proposal Content with OpenAI (GPT-4): It sends the input data to OpenAI (likely using the GPT-4 model, given the workflow name) to generate the core content of the business proposal.
  3. Formats Proposal Content: The generated text is then processed and formatted using a "Code" node to ensure it's suitable for a PDF document. This might involve adding markdown, HTML, or specific structural elements.
  4. Creates PDF in Google Drive: The formatted proposal content is converted into a PDF document and saved to a specified folder within Google Drive.
  5. Sends Email via Gmail: A notification email is sent via Gmail, likely containing a link to the newly generated proposal PDF and relevant details to the client or internal team.
  6. Posts Notification to Slack: A message is posted to a designated Slack channel, informing the team about the new proposal, its content, and the Google Drive link.
  7. Responds to Webhook: Finally, the workflow sends a response back to the initiating webhook, indicating the successful completion of the proposal generation process.

Prerequisites/Requirements

To use this workflow, you will need:

  • n8n Instance: A running n8n instance (cloud or self-hosted).
  • OpenAI API Key: An API key for OpenAI with access to GPT-4 or a similar model.
  • Google Drive Account: A Google account with access to Google Drive for storing the generated PDFs.
  • Gmail Account: A Google account with access to Gmail for sending email notifications.
  • Slack Account: A Slack workspace and a channel where notifications will be posted.

Setup/Usage

  1. Import the workflow: Download the JSON provided and import it into your n8n instance.
  2. Configure Credentials:
    • Set up your OpenAI credential with your API key.
    • Configure your Google Drive credential (OAuth2 recommended) to allow n8n to create files.
    • Configure your Gmail credential (OAuth2 recommended) to allow n8n to send emails.
    • Set up your Slack credential to allow n8n to post messages.
  3. Customize Nodes:
    • Webhook: Activate the webhook and copy its URL. This URL will be used to trigger the workflow.
    • OpenAI: Adjust the prompt in the OpenAI node to guide the AI in generating proposals specific to your needs.
    • Code: Modify the "Code" node if you need specific formatting or data manipulation for your proposals.
    • Google Drive: Specify the target folder ID in Google Drive where the PDFs should be saved.
    • Gmail: Customize the recipient, subject, and body of the email notification.
    • Slack: Adjust the Slack channel and message content for notifications.
  4. Activate the Workflow: Once all configurations are complete, activate the workflow.
  5. Trigger the Workflow: Send a POST request to the webhook URL with the necessary data in the request body to initiate the proposal generation.

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