AI-Powered Auto-Translate Google Slides Presentation to any language with Gemini

💬🗂️🤖 This workflow automates the translation of Google Slides presentations from any languages, while preserving the original formatting and slide structure. It leverages Google APIs, AI translation (Gemini/PaLM), and modular execution for high flexibility and accuracy.

DISCLAIMER: texts are split by Google Slides APIs into small blocks, so the translation will not always be contextualized.

Key Benefits

⚡ Time-Saving**: Automates a typically manual and error-prone task of translating slides. 🌍 AI-Powered Accuracy**: Uses Google Gemini to provide context-aware translations while respecting defined rules. 🔒 Safe & Non-Destructive**: The original presentation is never modified — a new copy is always created. 🎯 Precision**: Skips irrelevant text (e.g., emails, URLs, names) to avoid mistranslation. 🔁 Modular & Scalable**: Uses subworkflows and batching, ideal for presentations with many slides. 🎨 Layout Preservation**: Keeps the original design and formatting intact.

How it Works
Initialization:
The workflow starts with a manual trigger ("When clicking ‘Execute workflow’"). Set the language to translate (IMPORTANT format ISO-639) It duplicates a specified Google Slides presentation ("Duplicate presentation") to create a new copy for translation, preserving the original.

Slide Processing:
The workflow retrieves slides from the copied presentation ("Get slides from a presentation") and processes them in batches ("Loop Over Items").
For each slide, text content is extracted ("Extract Text") using a custom JavaScript snippet, which identifies and collects text elements while retaining the slide's objectId.

Translation:
The extracted texts are passed to a LangChain agent ("Translation expert"), which translates the content from Italian to English. The agent follows strict guidelines (e.g., skipping URLs, brand names, etc.).
The translated text is sent to the "Translate Google Slides" node, which replaces the original text in the presentation using the slide's objectId for targeting.

Execution Flow:
The workflow includes delays ("Wait 10 sec" and "Wait 3 sec") to manage API rate limits and ensure smooth execution.
The process repeats for each batch of slides until all content is translated.

Set Up Steps
Prerequisites:
Ensure access to the source Google Slides presentation (specified by fileId in "Duplicate presentation").
Set up Google OAuth2 credentials for Google Drive and Slides (nodes reference credentials like "Google Slides account").
Configure the Google Gemini (PaLM) API credentials for the translation agent.

Configuration:
Update the fileId in the "Duplicate presentation" node to point to your source presentation.
Adjust the translation guidelines in the "Translation expert" node if needed (e.g., language pairs or exclusion rules).
Modify batch sizes or wait times (e.g., "Wait 10 sec") based on API constraints.

Execution:
Run the workflow manually or trigger it via the "Execute Workflow" node from another workflow.
Monitor progress in n8n’s execution log, as each slide is processed and translated sequentially.

Output:
The translated presentation is saved as a new file in Google Drive, with the filename including a timestamp (e.g., NAME_PRESENTATION_{lang}_{timestamp}).

Note: The workflow is currently inactive ("active": false); enable it after configuration.

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