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Mainframe modernization

Foster innovation, increase agility, and reduce operational costs by modernizing your mainframes to Google Cloud with automation, industry expertise, risk-mitigated migration tools, and a rich partner ecosystem.


Move on from proprietary mainframes and innovate with Google Cloud

Mitigate risk and enhance flexibility

Leverage world-class solutions to reduce migration time, cost, and risks. Eliminate dependency on scarce skills, gain access to top engineering talent, and avoid vendor lock-in by modernizing to open software.

Gain operational and analytical efficiency

Escape capital-intensive mainframe refresh cycle. Move to a modern cloud-based model to reduce operational cost and improve maintainability. Gain new insights from mainframe data by moving it to Google Cloud.

Deliver agile services

Evolve software capabilities for faster and frequent business updates. Use technologies such as GKE and DevOps toolchains alongside your on-premises workloads to accelerate time to market.

Key features

Why you should modernize and move your mainframe applications to Google Cloud

Google's tools, experience, industry expertise, and partners make your move easy from many mainframe technologies, including IBM Z™ and IBM I™.

Business-led approach

Google's experienced team will work with you to understand the best modernization approach for your business applications. We’ll perform application and technology assessments to determine suitability for being refactored into a modern language, emulated without change, rewritten, or retired. And we’ll leverage our unique tools, like G4, Dual Run, and Mainframe Connector. 

Reduce time, cost, and risk with Dual Run

Dual Run enables customers to simultaneously run workloads on their existing mainframes and on Google Cloud, allowing them to perform real-time testing and quickly gather data on performance and stability with no disruption to their business. Once satisfied with the functional performance equivalence of the two systems, the new Google Cloud environment can be made the customers’ system of record.

Choice of technology

Move existing workloads previously locked in to the mainframe environment to your choice of compute, using services such as Google Compute Engine and Google Kubernetes Engine.

Leverage Google Cloud products to provide additional value to your apps, such as BigQuery for running complex analytics. Add Cyber Resiliency capabilities from Actifio, now part of Google Cloud.

World-class automated tooling

Uncover the fine-detailed view of your mainframe applications like composition and interrelationships using our application discovery and conversion software, G4. Use Dual Run to operate your mainframes on-prem and in Google Cloud in parallel, for proper testing and benchmarking. Use the 'Open Source' Mainframe Connector to move the mainframe data to Google Cloud Storage and BigQuery

Expert guidance and partners

Google Cloud consultants and our specialized partners will advise and design the future cloud architecture, dependencies, and steps for mainframe migration and modernization. 

Google is also proud to be recognized as a Leader in ISG Provider Lens™ Quadrant 2022: 

ISG Provider Lens Mainframes Quadrant

Google named Leader in 2022 ISG Provider Lens™ Quadrant Report for software

Google's G4 mainframe code conversion software has been recognized for two years running as leading in the field of mainframe modernization software.


Google Cloud welcomes these customers who have fully migrated from the mainframe

Google and our partners are working with a large number of clients to move their mainframe applications to Google Cloud. Whilst most projects are in progress, these have completed.



Our large ecosystem of trusted industry partners with specialist mainframe skills and technology complement our own to address legacy software and systems.

Our delivery partners work with our mainframe specialist teams to scale and help deliver your mainframe applications to Google Cloud with the fastest time to value.

Our technology partners ensure we can solve and deliver the best fit solutions to the transformed mainframe application. We use these to expand existing Google Cloud services.

Related services

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