Leptonica 1.78.0 DLL Troubleshooting for IronOCR

Curtis Chau

Updated: May 9, 2026

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  # Leptonica 1.78.0 DLL Troubleshooting for IronOCR Error: Could not find or load the native library from any name: [ leptonica-1.78.0.dll, liblept, liblept.dll ] This issue is typically seen when moving a project from a development machine to production. It is caused when Microsoft Visual C++ Redistributables for Visual Studio (2015-2022) are not installed. Both x86 and x64 versions are required. For more information, please see: [IronOCR Troubleshooting Guide](https://ironsoftware.com/csharp/ocr/troubleshooting/visual-c-redistributable-for-visual-studio-ironocr/)

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Error: Could not find or load the native library from any name: [ leptonica-1.78.0.dll, liblept, liblept.dll ]

This issue is typically seen when moving a project from a development machine to production.

It is caused when Microsoft Visual C++ Redistributables for Visual Studio (2015-2022) are not installed.

Both x86 and x64 versions are required. For more information, please see: IronOCR Troubleshooting Guide

Curtis Chau

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Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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