MiniExcel is a .NET library for reading, writing, and processing Excel and CSV files with minimal memory consumption.
The tool addresses the memory overhead problem that arises when working with large spreadsheets. Traditional Excel processing frameworks load entire documents into memory, which can consume hundreds of megabytes and trigger out-of-memory errors. MiniExcel instead processes data row by row using a streaming approach, reducing memory usage to just a few megabytes. This design enables real-time, row-level operations and supports LINQ queries with deferred execution, making it practical for handling large datasets without full garbage collection pauses.
The library suits projects that need to process substantial Excel files on resource-constrained systems or in high-throughput scenarios where memory efficiency matters. It works well for applications requiring simple read, write, and fill operations without external dependencies—the entire package is under 500 KB and requires no Microsoft Office or COM+ components. The straightforward API makes it accessible for developers who want to avoid the complexity and overhead of heavier frameworks.
Development activity shows consistent engagement with the codebase, with regular updates addressing both core functionality and new capabilities. The project is actively preparing a version with modular architecture, separating core and CSV functionality into distinct packages, and introducing full asynchronous streaming support through IAsyncEnumerable. The maintainers are soliciting feedback on prerelease versions, indicating an iterative approach to evolving the tool's design.
