ConvertX is a self-hosted, open-source online file conversion tool designed to provide a versatile and private solution for converting files across a wide range of formats. It supports over 1,000 file formats, leveraging powerful libraries and tools such as FFmpeg for video, Pandoc for documents, GraphicsMagick and Vips for images, and Inkscape for vector graphics, among others. This extensive compatibility makes it a comprehensive option for users needing to transform media, documents, 3D assets, and more. Ideal for self-hosting enthusiasts, ConvertX combines functionality with privacy, allowing users to process files locally without relying on third-party services. In this step by step guide I will show you how to install ConvertX on your Synology NAS using Docker & Portainer.

💡Note: This guide works perfectly with the latest version of ConvertX v0.12.1

• STEP 1

Please Support My work by Making a Donation.

• STEP 2

Install Portainer using my step by step guide. If you already have Portainer installed on your Synology NAS, skip this STEP. Attention: Make sure you have installed the latest Portainer version.

• STEP 3

Go to File Station and open the docker folder. Inside the docker folder, create one new folder and name it convertx. Follow the instructions in the image below.
Note: Be careful to enter only lowercase, not uppercase letters.

• STEP 4

Log into Portainer using your username and password. On the left sidebar in Portainer, click on Stacks then + Add stack. Follow the instructions in the image below.

• STEP 5

In the Name field type in convertx. Follow the instructions in the image below.

Note: Copy Paste the code below in the Portainer Stacks Web editor.

services:
  convertx: 
    image: ghcr.io/c4illin/convertx:latest
    container_name: Convertx
    healthcheck:
      test: ["CMD-SHELL", "nc -z 127.0.0.1 3000 || exit 1"]
      interval: 10s
      timeout: 5s
      retries: 3
      start_period: 90s
    ports:
      - 3522:3000
    environment:
      JWT_SECRET: dOxZYTTZgXKMHkqLBIQVImayQXAVWdzGBPuFJKggzcgvgPJPXpWzqzKaUOIOGGIr
      ACCOUNT_REGISTRATION: true #Set To false To Disallow User Registration.
      HTTP_ALLOWED: true #Allow HTTP Connections, Only Set This To true Locally.
      ALLOW_UNAUTHENTICATED: false 	#Allow Unauthenticated Users To Use The Service, Only Set This To true Locally.
    volumes:
      - /volume1/docker/convertx:/app/data:rw
    restart: on-failure:5

Note: Before you paste the code above in the Web editor area below, change the value for JWT_SECRET. (Generate your own Random 64 length JWT_SECRET.)

• STEP 6

Scroll down the page until you see a button called Deploy the stack. Click on it. Follow the instructions in the image below. The installation process can take up to a few minutes. It will depend on your Internet speed connection.

• STEP 7

If everything goes right, you will see this message at the top right of your screen: “Success Stack successfully deployed“.

• STEP 8

🟢Please Support My work by Making a Donation. Almost 99,9% of the people that install something using my guides forget to support my work, or just ignore STEP 1. I’ve been very honest about this aspect of my work since the beginning: I don’t run any ADS, I don’t require subscriptions, paid or otherwise, I don’t collect IPs, emails, and I don’t have any referral links from Amazon or other merchants. I also don’t have any POP-UPs or COOKIES. I have repeatedly been told over the years how much I have contributed to the community. It’s something I love doing and have been honest about my passion since the beginning. But I also Need The Community to Support me Back to be able to continue doing this work.

• STEP 9

The installation process can take up to a few seconds/minutes. It will depend on your Internet speed connection. Now open your browser and type in http://Synology-ip-address:3522 Type in your own Email Address and Password, then click Create account. Follow the instructions in the image below.

• STEP 10

Upload the file that you want to convert from your PC. Follow the instructions in the image below.

• STEP 11

From the list, Select the format to which you want to convert the file. Follow the instructions in the image below.

• STEP 12

Click Convert. Follow the instructions in the image below.

• STEP 13

Wait until the file is converted. Once the file is converted, it will be in the “Results” list. Click Download to download the converted file in the format that you have previously selected at STEP 11. Follow the instructions in the image below.

Enjoy ConvertX!

🆘TROUBLESHOOTING

Note: If you want to run the ConvertX container over HTTPS, check How to Run Docker Containers Over HTTPS. In order to make ConvertX work over https, it’s also mandatory to set up WebSocket.

If you encounter issues by using this container, make sure to check out the Common Docker issues article.

Note: Can I run Docker on my Synology NAS? See the supported models.
Note: How to Back Up Docker Containers on your Synology NAS.
Note: Find out how to update the ConvertX container with the latest image.
Note: How to Free Disk Space on Your NAS if You Run Docker.
Note: How to Schedule Start & Stop For Docker Containers.
Note: How to Activate Email Notifications.
Note: How to Add Access Control Profile on Your NAS.
Note: How to Change Docker Containers Restart Policy.
Note: How to Use Docker Containers With VPN.
Note: Convert Docker Run Into Docker Compose.
Note: How to Clean Docker.
Note: How to Clean Docker Automatically.
Note: Best Practices When Using Docker and DDNS.
Note: Some Docker Containers Need WebSocket.
Note: Find out the Best NAS Models For Docker.
Note: Activate Gmail SMTP For Docker Containers.

This post was updated on Thursday / April 3rd, 2025 at 11:19 AM