Lucas Peyrin This workflow corresponds to n8n.io template #5155 — we link there as the canonical source.
The workflow JSON
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{
"nodes": [
{
"id": "89bc61ce-8d29-403c-96d2-f1db4e7ad092",
"name": "Extract from File",
"type": "n8n-nodes-base.extractFromFile",
"notes": "\u00a9 2025 Lucas Peyrin",
"position": [
-592,
352
],
"parameters": {
"options": {},
"operation": "binaryToPropery",
"binaryPropertyName": "={{ Object.keys($binary).first() }}"
},
"typeVersion": 1
},
{
"id": "58ece6f1-fd56-4f4d-a1ca-49ea8062f5a3",
"name": "SET OUTPUT FILE NAME",
"type": "n8n-nodes-base.set",
"notes": "\u00a9 2025 Lucas Peyrin",
"position": [
-976,
352
],
"parameters": {
"options": {},
"assignments": {
"assignments": [
{
"id": "db6b30b5-a420-430b-87ae-a4887bfe9628",
"name": "binary_key",
"type": "string",
"value": "={{ Object.keys($binary).first() }}"
},
{
"id": "8e1643f7-e794-43b2-a5ac-80b6b621b547",
"name": "output_file_name",
"type": "string",
"value": "SET YOUR OUTPUT FILE NAME AND EXTENSION !! (ex: .mp3 or .png)"
}
]
},
"includeOtherFields": true
},
"typeVersion": 3.4
},
{
"id": "29b91d27-8a15-44e2-87fa-f431e9ad042d",
"name": "Change Binary Data Type",
"type": "n8n-nodes-base.code",
"notes": "\u00a9 2025 Lucas Peyrin",
"position": [
-368,
352
],
"parameters": {
"jsCode": "const myBuffer = Buffer.from($json.data, 'base64');\n\n$input.item.binary = {\n [$('SET OUTPUT FILE NAME').last().json.binary_key]: await this.helpers.prepareBinaryData(myBuffer, $('SET OUTPUT FILE NAME').last().json.output_file_name)\n};\n\nreturn $input.item;\n"
},
"typeVersion": 2
},
{
"id": "224923e0-a967-42ff-b55a-b31720d54e8e",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1136,
16
],
"parameters": {
"color": 3,
"width": 420,
"height": 500,
"content": "### \u2699\ufe0f CONFIGURE HERE \u2699\ufe0f\n\nThis is the main node you need to edit.\n\n1. **`output_file_name`**: Change this value to the desired file name and extension. The extension is what determines the new MIME type.\n * **Example:** To convert to an MP3, set the value to `audio.mp3`.\n * **Example:** To ensure a file is treated as a PNG, set it to `image.png`.\n\n2. **`binary_key`**: This field is dynamic and automatically finds the name of the incoming binary property. **Do not change this.**"
},
"typeVersion": 1
},
{
"id": "cb424eb0-4779-4969-bbea-d994bc504761",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-672,
96
],
"parameters": {
"color": 7,
"width": 480,
"height": 420,
"content": "### \u2699\ufe0f Core Logic (No Edit Needed)\n\nThese nodes work together to perform the conversion:\n\n1. **Extract from File:** Converts the binary into text (Base64).\n2. **Code:** Rebuilds the binary file using the new file name you provided in the previous step.\n\nThis process effectively changes the file's perceived format for other n8n nodes or external services."
},
"typeVersion": 1
},
{
"id": "518b1531-fdb4-4ea6-9623-2b1982e15a43",
"name": "Change Binary MimeType/Extension",
"type": "n8n-nodes-base.executeWorkflowTrigger",
"notes": "\u00a9 2025 Lucas Peyrin",
"position": [
-1344,
352
],
"parameters": {
"inputSource": "passthrough"
},
"typeVersion": 1.1
},
{
"id": "231fc258-e1d1-4a50-aa02-c40db76f42bf",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-160,
-544
],
"parameters": {
"color": 7,
"width": 416,
"height": 1056,
"content": "## Was this helpful? Let me know!\n[](https://workflows.ac/form)\n\nI really hope this tutorial helped you understand how to manipulate Binary data better. Your feedback is incredibly valuable and helps me create better resources for the n8n community.\n\n### **Have Feedback, a Question, or a Project Idea?**\n\n\n#### \u27a1\ufe0f **[Click here to go to the Contact Form](https://workflows.ac/form?utm_source=n8n_template&utm_medium=workflow_note&utm_campaign=change_binary_mime_type_extension&utm_content=5155)**\n\nUse this single link for anything you need:\n\n* **Give Feedback:** Share your thoughts on this template, whether you found a typo, encountered an unexpected error, have a suggestion, or just want to say thanks!\n\n* **Automation Coaching:** Get personalized, one-on-one guidance to master n8n. We can work together to help you reach an expert level.\n\n* **Automation Consulting:** Have a complex business challenge or need custom workflows built from scratch? We offer a plug and play automation department for 8 to 88 people teams with unlimited automation requests.\n\n---\n\nHappy Automating!\nLucas Peyrin | [Workflows Accelerator](https://workflows.ac?utm_source=n8n_template&utm_medium=workflow_note&utm_campaign=change_binary_mime_type_extension&utm_content=5155)"
},
"typeVersion": 1
},
{
"id": "fb0fa541-840b-4bdc-be0b-c8c4ac106de6",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1904,
-144
],
"parameters": {
"width": 496,
"height": 656,
"content": "## \ud83d\udd04 Change Binary File Extension & MIME Type\n\nThis utility workflow solves the common headache of receiving files with generic extensions (like `.bin` or `.dat`) by forcing the correct filename and MIME type so your downstream apps process them correctly.\n\n**How it works:**\n* **Define Output**: You simply specify the desired output filename and extension (e.g., change a generic file to `invoice.pdf` or `audio.mp3`) in the Set node.\n* **Process Data**: The workflow temporarily converts the binary data into Base64 to handle the structure safely.\n* **Rebuild**: It reconstructs the binary object with your new specific metadata, making it perfectly compatible with your next automation steps.\n\n---\n\n### Automate your operations today\nYour time is valuable. Let us automate the boring stuff for you.\n\n**\ud83d\udc47 CHOOSE YOUR PATH:**\n\n[ **\u26a1\ufe0f I WANT A FREE AUDIT (2 min)** ](https://workflows.ac/audit?utm_source=n8n_template&utm_medium=workflow_note&utm_campaign=change_binary_mime_type_extension&utm_content=5155)\n> *We've put our heart into this business evaluation machine.*\n\n[ **\ud83d\udca1 I HAVE A SPECIFIC REQUEST** ](https://workflows.ac/form?utm_source=n8n_template&utm_medium=workflow_note&utm_campaign=change_binary_mime_type_extension&utm_content=5155)"
},
"typeVersion": 1
}
],
"connections": {
"Extract from File": {
"main": [
[
{
"node": "Change Binary Data Type",
"type": "main",
"index": 0
}
]
]
},
"SET OUTPUT FILE NAME": {
"main": [
[
{
"node": "Extract from File",
"type": "main",
"index": 0
}
]
]
},
"Change Binary MimeType/Extension": {
"main": [
[
{
"node": "SET OUTPUT FILE NAME",
"type": "main",
"index": 0
}
]
]
}
}
}
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About this workflow
This workflow changes the file name, and therefore the extension and MIME type, of any binary file passed to it. This is perfect for converting file formats on the fly, like turning a Telegram voice message () into an MP3 for an AI transcription service. Set New File Name: The…
Source: https://n8n.io/workflows/5155/ — original creator credit. Request a take-down →
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