Greenmask

6.9easy start · #5 of 22
in Data Masking Software

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you worknot on record

Runs on Linux, Mac, self-hosted.

Greenmask is ranked #5 of 22 in data masking software on The Geeks Club. It runs on Linux, macOS, Self-hosted. There is a free plan.

Greenmask plans and pricing

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Greenmask Free Open-source utility · PostgreSQL supported · MySQL support in progress github.com · 29 Sept 2026

Compared on data masking software

Free plan: Yes
Masking methods: static
Synthetic data: Yes
Referential integrity: Yes
Deployment options: on-premises
Data subsetting: Yes

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The record

Purpose: Greenmask is an open-source utility for logical database dumping, anonymization, synthetic data generation, and restoration.
PostgreSQL compatibility: Greenmask is compatible with PostgreSQL versions 11 and higher.
Database support: PostgreSQL is fully supported, while MySQL is described as in progress and beta.
Subsetting: Database subsetting can create smaller development databases while preserving referential integrity, including cyclic and polymorphic references.
Transformations: Greenmask provides deterministic and random transformers, dynamic parameters, conditional transformations, and inheritance for partitions and foreign key references.
Custom transformations: Users can create custom transformers that interact through standard input and output, and the tool also provides predefined templates.
Storage integrations: Supported storage backends include local directories, S3-compatible storage, Azure Blob Storage, and SSH/SFTP.
Database tools: Greenmask uses PostgreSQL's pg_dump and pg_restore utilities to handle schema dumping and restoration, and its dumps can be restored with pg_restore.
CI/CD: Greenmask is designed to integrate into CI/CD systems for automated database anonymization and restoration.
Security architecture: Greenmask describes a stateless in-flight transformation design that can anonymize data before it is persisted and does not require persistent storage of unmasked datasets in its normal workflow.
Security reporting: The security policy asks researchers to report vulnerabilities privately by email or GitHub private vulnerability reporting and says receipt will be acknowledged within 72 hours.
Supported releases: The security policy supports the latest stable release and lists older releases as unsupported.
Installation limit: The installation guide says the install script works on Linux and macOS and that Windows is not supported yet.
Company history: Greenmask says it was founded in 2023 with the launch of its Greenmask utility.
Price from: Free

Where it ranks on The Geeks Club

Best Data Masking Software in 2026#5 of 22

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Sources

github.com/GreenmaskIO/greenmask· checked 29 Sept 2026
docs.greenmask.io/latest/architecture/· checked 29 Sept 2026
docs.greenmask.io· checked 29 Sept 2026
docs.greenmask.io/latest/configuration/· checked 29 Sept 2026
github.com/GreenmaskIO/greenmask/blob/main/SECURIT· checked 29 Sept 2026
docs.greenmask.io/v0.2.15/installation/· checked 29 Sept 2026
greenmask.io/about· checked 29 Sept 2026