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Greenmask
What it is
Greenmask is a free, open-source utility for logical database dumps, anonymization, synthetic data generation, and restoration. PostgreSQL 11 and later are fully supported; MySQL support is described as in progress and beta. Database subsetting can produce smaller development databases while preserving referential integrity, including cyclic and polymorphic references. Transformation options include deterministic and random methods, dynamic parameters, conditional rules, and inheritance across partitions and foreign-key references. Users can create custom transformers that communicate through standard input and output, or use predefined templates. Storage backends include local directories, S3-compatible storage, Azure Blob Storage, and SSH/SFTP. Greenmask uses PostgreSQL’s pg_dump and pg_restore utilities for schema dumping and restoration, and its dumps can be restored with pg_restore. It is designed for CI/CD workflows that automate anonymization and restoration. The project describes its stateless, in-flight design as transforming data before persistence without requiring unmasked datasets to be persistently stored in its normal workflow. Installation scripts support Linux and macOS; Windows is not supported yet.
For and against
For
- Free and open-source
- Subsetting preserves referential integrity
- Supports multiple transformation types and custom transformers
- Storage includes S3-compatible and Azure Blob options
- Designed for CI/CD automation
Against
- MySQL support is still in progress and beta
- Windows is not supported yet
- Installation scripts support Linux and macOS
The verdict
Greenmask combines database dumping, transformation, subsetting, and restoration for PostgreSQL workflows. MySQL remains beta, and Windows is not supported, so confirm that its database and operating-system coverage fits your setup.
Who it suits
Greenmask suits teams that need to anonymize, subset, or generate data for PostgreSQL development and CI/CD workflows. It may fit teams that can run a self-hosted utility on Linux or macOS.
Plans and prices
Greenmask
Open-source utility · PostgreSQL supported · MySQL support in progress
Read 29 Sep 2026 · github.com
On the record
- CI/CD
- Greenmask is designed to integrate into CI/CD systems for automated database anonymization and restoration.docs.greenmask.io · read 29 Sep 2026
- Company history
- Greenmask says it was founded in 2023 with the launch of its Greenmask utility.greenmask.io · read 29 Sep 2026
- Custom transformations
- Users can create custom transformers that interact through standard input and output, and the tool also provides predefined templates.docs.greenmask.io · read 29 Sep 2026
- Database support
- PostgreSQL is fully supported, while MySQL is described as in progress and beta.github.com · read 29 Sep 2026
- 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.docs.greenmask.io · read 29 Sep 2026
- Installation limit
- The installation guide says the install script works on Linux and macOS and that Windows is not supported yet.docs.greenmask.io · read 29 Sep 2026
- PostgreSQL compatibility
- Greenmask is compatible with PostgreSQL versions 11 and higher.docs.greenmask.io · read 29 Sep 2026
- Purpose
- Greenmask is an open-source utility for logical database dumping, anonymization, synthetic data generation, and restoration.github.com · read 29 Sep 2026
- 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.github.com · read 29 Sep 2026
- 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.github.com · read 29 Sep 2026
- Storage integrations
- Supported storage backends include local directories, S3-compatible storage, Azure Blob Storage, and SSH/SFTP.docs.greenmask.io · read 29 Sep 2026
- Subsetting
- Database subsetting can create smaller development databases while preserving referential integrity, including cyclic and polymorphic references.github.com · read 29 Sep 2026
- Supported releases
- The security policy supports the latest stable release and lists older releases as unsupported.github.com · read 29 Sep 2026
- Transformations
- Greenmask provides deterministic and random transformers, dynamic parameters, conditional transformations, and inheritance for partitions and foreign key references.docs.greenmask.io · read 29 Sep 2026
