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Extract text from images with Telegram Bot & OCR Tesseractjs

Rudi AfandiRudi Afandi
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2/3/2026
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Description This n8n workflow enables users to send an image to a Telegram bot and receive the extracted text using Tesseract OCR (via the n8n-nodes-tesseractjs Community Node). It's a quick and straightforward way to convert images into readable text directly through chat.

How it Works

  • The workflow listens for new image messages coming in via the Telegram bot.

  • Once an image is received, it downloads the image file from Telegram (which initially arrives as application/octet-stream).

  • The image data, now properly identified, is then sent to the Tesseract OCR node to extract the text.

  • Finally, the recognized text is sent back as a reply to the Telegram user.

Setup Steps

  • Install Community Node: Ensure you have installed n8n-nodes-tesseractjs in your n8n instance.

  • Connect Telegram Bot: Configure the Telegram Trigger node with your Telegram bot.

  • Bot Token: Add your Telegram bot token to the Send Message node to send replies.

  • Deploy & Test: Activate (deploy) the workflow and send an image to your Telegram bot to test.

Extract Text from Images with Telegram Bot (OCR Tesseract.js)

This n8n workflow creates a Telegram bot that can extract text from images using OCR (Optical Character Recognition) powered by Tesseract.js. Simply send an image to the bot, and it will respond with the extracted text.

What it does

  1. Listens for Telegram Messages: The workflow is triggered when a message is sent to your configured Telegram bot.
  2. Identifies Image Attachments: It checks if the incoming Telegram message contains an image attachment.
  3. Downloads Image: If an image is present, it downloads the image file.
  4. Performs OCR: It then uses Tesseract.js (via a Code node) to perform OCR on the downloaded image, extracting any text found.
  5. Sends Extracted Text to Telegram: Finally, the extracted text is sent back to the user via the Telegram bot.

Prerequisites/Requirements

  • n8n Instance: A running instance of n8n.
  • Telegram Bot: A Telegram bot token (obtained from BotFather).
  • Tesseract.js (via Code Node): The workflow uses a Code node to implement Tesseract.js. This means your n8n environment needs to support running custom JavaScript code that can utilize external libraries (though Tesseract.js is typically self-contained for browser/Node.js environments).

Setup/Usage

  1. Import the Workflow:
    • Download the provided JSON file.
    • In your n8n instance, click on "Workflows" in the left sidebar.
    • Click "New" -> "Import from JSON" and paste the workflow JSON or upload the file.
  2. Configure Telegram Credentials:
    • Locate the "Telegram Trigger" and "Telegram" nodes.
    • Click on the "Credential" field for each and select "Create New Credential".
    • Choose "Telegram API" and enter your Telegram Bot Token.
    • Save the credential.
  3. Activate the Workflow:
    • Once the credentials are set up, activate the workflow by toggling the "Active" switch in the top right corner of the workflow editor.
  4. Interact with the Bot:
    • Open your Telegram app and find your bot.
    • Send an image to the bot.
    • The bot will process the image and respond with the extracted text.

Note on Tesseract.js: The "Code" node is responsible for the OCR. Ensure that the JavaScript code within this node is correctly configured to use Tesseract.js and handle image data. You might need to install tesseract.js in your n8n environment if it's not already available for the Code node to use.

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