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Encrypted secret sharing for everyone!

This application is designed for sharing encrypted information across organizations or among private individuals. Hemmelig places a high priority on safeguarding your privacy and will make every effort to maintain it. We trust you will find value in using our product.


Hemmelig is available at


How it works

You enter, write your sensitive information, expire time, optional password, and click create a secret link. You share the secret link. The receiver of the link opens it, writes the optional password, and retrieves the sensitive information. When a secret link is created, it gets its unique decryption key that is not saved to the database and only will be part of the URL. This is how the encryption works: encrypt(DATA, YOUR_UNIQUE_ENCRYPTION_KEY). The encryption of the text and files is done in the client; this means the server will get the encrypted information, and nothing in clear text.


  • Client side encryption
  • Text formatting and inline image upload (mark the text for the popup)
  • Encrypted sensitive information sharing
  • Encrypted file upload for signed in users
  • Secret lifetime
  • Set max views per secret
  • Optional encrypted title
  • Optional password protection
  • Optional IP address restriction
  • QR Code of the secret link
  • Decryption key is part of the URL, and not saved to the database for an extra layer of security
  • Possible to send the secret link and the decryption key separately
  • Convert the secret to base64 on read
  • Rate limited API
  • Self-hosted version. Keywords: Regulatory compliance
  • CLI Support
  • Using Prisma with SQLite
  • Public pastes
    • These will not be encrypted
    • Not allowed with file uploads
    • The IP address will be recorded
    • List public pastes based on username
  • User account
    • Expiration time upgraded to 14 and 28 days
    • File upload
    • List and delete secrets
  • Admin settings
    • Disable user registration / sign in
    • Set Hemmelig to be in read only mode by non admin users
    • Disable file upload
    • Disable user account creation
    • Allow organization email domain only for user registration

Linode Referral is running on Linode, and is not being sponsored by anyone. If you want to support Hemmelig, and use Linode. Here is a referral link that we get free credit if you use. By using this link you will get $100 of credit as well:

Docker image

Hemmelig strongly advice you to ue the tagged docker images as the main branch will have breaking changes now and then. For Hemmelig versions supporting Redis, use <= v4.4.0.

Supported docker platforms: amd/64, arm/64.

  • hemmeligapp/hemmelig:latest (Is created on each version release)
  • hemmeligapp/hemmelig:v5.19.4 see tags for all version
  • hemmeligapp/hemmelig:weekly (pushed every week on Friday)
  • hemmeligapp/hemmelig:daily


If you have to follow some sort of compliance, and have to self-host, is available as a docker image. The following is the bare minimum to run the docker image.

mkdir -p data/hemmelig database
chown 1000:1000 data/hemmelig database

docker run -p 3000:3000 -d --name=hemmelig \
   -v ./data/hemmelig/:/var/tmp/hemmelig/upload/files \ # For the file uploads
   -v ./database/:/home/node/hemmelig/database/ \       # For the sqlite database

Alternatively you can use docker-compose:

# fetch docker-compose.yml

# create volumes directories
mkdir -p data/hemmelig database

# set permissions (Node user has UID 1000 within the container)
chown 1000:1000 data/hemmelig database

# start hemmelig 
docker-compose up -d

# stop containers
docker-compose down

Have a look at the Dockerfile for a full example of how to run this application.


Hemmelig can be used as a CLI to create secrets on the fly!

# Pipe data to hemmelig
cat mysecretfile | npx hemmelig

# For the documentaiton
npx hemmelig --help

Environment variables

ENV vars Description Default
SECRET_LOCAL_HOSTNAME The local hostname for the fastify instance
SECRET_PORT The port number for the fastify instance 3000
SECRET_HOST Used for i.e. set cors/cookies to your domain name ""
SECRET_MAX_TEXT_SIZE The max text size for the secret. Is set in kb. i.e. 256 for 256kb. 256
SECRET_JWT_SECRET Override this for the secret signin JWT tokens for log in good_luck_have_fun
SECRET_ROOT_USER Override this for the root account username groot
SECRET_ROOT_PASSWORD This is the root password, override it with your own password iamgroot
SECRET_ROOT_EMAIL This is the root email, override it with your own email
SECRET_FILE_SIZE Set the total allowed upload file size in mb. 4
SECRET_FORCED_LANGUAGE Set the default language for the application. en
SECRET_UPLOAD_RESTRICTION Set the restriction for uploads to signed in users "true"
SECRET_RATE_LIMIT_MAX The maximum allowed requests each time frame 1000
SECRET_RATE_LIMIT_TIME_WINDOW The time window for the requests before being rate limited in seconds 60
SECRET_DO_SPACES_ENDPOINT The Digital Ocean Spaces/AWS s3 endpoint ""
SECRET_DO_SPACES_KEY The Digital Ocean Spaces/AWS s3 key ""
SECRET_DO_SPACES_SECRET The Digital Ocean Spaces/AWS s3 secret ""
SECRET_DO_SPACES_BUCKET The Digital Ocean Spaces/AWS s3 bucket name ""
SECRET_DO_SPACES_FOLDER The Digital Ocean Spaces/AWS s3 folder for the uploaded files ""
SECRET_AWS_S3_REGION The Digital AWS s3 region ""
SECRET_AWS_S3_KEY The Digital AWS s3 key ""
SECRET_AWS_S3_SECRET The Digital AWS s3 secret ""
SECRET_AWS_S3_BUCKET The Digital AWS s3 bucket name ""
SECRET_AWS_S3_FOLDER The Digital AWS s3 folder for the uploaded files ""

Supported languages

Have a look at the public/locales/ folder.

Run locally

npm install

# Start the frontend/backend
npm run dev


Hemmelig has changed from using Redis as an backend to sqlite. Here we are using Prisma, and the sqlite file is available here: /database/hemmelig.db. Have a look at the docker-compose file for how to handle the database.

Admin, roles and settings

Admins have access to adjust certain settings in Hemmelig. If you go to the account -> instance settings, you can see all the settings.

We also have different roles.

  • Admin
  • Creator
  • User

The difference here is that if you i.e. set Hemmelig to be in read only mode, only admin and creator is allowed to create secrets, but non signed in users, and users with the role user can only view them.

Admins are also allowed to create new users in the settings. This is great if you want to limit who your users are by the disable user account creation setting.

My lovely contributors


Feel free to contribute to this repository. Have a look at for the guidelines.

Common errors

If this errors occur on the first run of your hemmelig instance, this means there are some issues with the ownership of the files/directory for the database.

Datasource "db": SQLite database "hemmelig.db" at "file:../database/hemmelig.db"

Error: Migration engine error:
SQLite database error
unable to open database file: ../database/hemmelig.db

If you have any issues with uploading files for your instance, you will need the following as well:

Here is an example of how you would solve that:

sudo chown -R /home/username/data/
sudo chown -R /home/username/database/