# Validate email hero images with Gmail and Dropbox: n8n workflow

> Started by an event in a connected app, and works across Gmail and Google Sheets. 10 steps: a working afternoon to understand properly.

Source: https://millionrounds.com/workflow/validate-email-hero-images-with-gmail-and-dropbox (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Documents and files](https://millionrounds.com/workflows?category=Documents+and+files#library)

# Validate email hero images with Gmail and Dropbox

Started by an event in a connected app, and works across Gmail and Google Sheets. 10 steps: a working afternoon to understand properly.

Medium

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fvalidate-email-hero-images-with-gmail-and-dropbox)

**10 steps** Medium: a working afternoon

**0** Branches: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 1 Logic 3 Service 6

The steps in the order they run, from what starts it.

- 1 **When clicking ‘Execute workflow’** Manual trigger *Starts it*
- 2 **Get many messages** Gmail *Service*
- 3 **Extract Hero Image SRC From HTML** Code *Logic*
- 4 **Convert Image File from HTML to Binary** Http Request *Service*
- 5 **Convert Image File from Dropbox to Binary** Http Request *Service*
- 6 **Extracting Actual Image Content from OCR** Http Request *Service*
- 7 **Extracting Expected Image Content from OCR1** Http Request *Service*
- 8 **Combine Image Outputs** Merge *Logic*
- 9 **Extract Content Match Results** Code *Logic*
- 10 **Log Image Checks to Excel** Google Sheets *Service*

## How it's built

- **Starts on:** An event in a connected app
- **Steps:** 10
- **Size:** Medium: a working afternoon
- **Connects to:** Gmail, Google Sheets
- **Model:** None. This is plumbing, not judgement

## Questions

What does it need to run?

An n8n account, plus your own Gmail and Google Sheets accounts. You connect your own accounts after importing it; none are included.

What starts it?

It starts on an event in a connected app.

Does it use AI?

No. Every step is fixed logic or a call to a service, so it does the same thing every time.

How long does it take to set up?

Plan an afternoon. 10 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 10 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fvalidate-email-hero-images-with-gmail-and-dropbox)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Gmail](https://millionrounds.com/workflows?service=Gmail#library)[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)

## Workflows like it

Also documents and files, with the same services where possible, closest in size first.

- [**Auto-generate and auto-fill business documents** 10 steps · Gmail, Google Drive](https://millionrounds.com/workflow/auto-generate-and-auto-fill-business-documents)
- [**Convert web pages from Google Sheets to Drive markdown files** 10 steps · Google Drive, Google Sheets](https://millionrounds.com/workflow/convert-web-pages-from-google-sheets-to-drive-markdown-files)
- [**Detect duplicate Google Drive files and log results** 10 steps · Gmail, Google Drive](https://millionrounds.com/workflow/detect-duplicate-google-drive-files-and-log-results)
- [**Extract YouTube transcripts with Google Sheets** 10 steps · Google Sheets](https://millionrounds.com/workflow/extract-youtube-transcripts-with-google-sheets)
- [**Generate PDF documents from HTML with PDF Generator API** 10 steps · Gmail, Postgres](https://millionrounds.com/workflow/generate-pdf-documents-from-html-with-pdf-generator-api)
- [**Hackathon participant badge generator with PDF** 10 steps · Gmail, Google Sheets](https://millionrounds.com/workflow/hackathon-participant-badge-generator-with-pdf)