Extract text from Ladder logic diagrams (LLD)
To convert LLD diagrams to another format, you need Siemens LOGO! Soft Comfort or other Developer software.
To convert other file formats to the "Ladder Logic Program" file type, you need software like Siemens LOGO! Soft Comfort or a similar tool.
The .LLD file extension primarily represents a LOGO! Ladder Logic Diagram created by Siemens LOGO! Soft Comfort. Automation engineers use it to program control tasks for Siemens LOGO! Programmable Logic Controllers (PLCs). A smaller percentage of .LLD files are Lingea Dictionary Data Files, which are used by the Lingea Lexicon 5 software to store offline electronic dictionary definitions.
The main disadvantage of a Siemens .LLD file is its proprietary structure. You cannot open it natively in Windows, macOS, or any standard web browser. It requires heavy, specialized desktop software to view, edit, or simulate the electrical logic. If you send an .LLD file to a client or a field technician, they cannot open it unless they also have a licensed installation of LOGO! Soft Comfort. Similarly, Lingea dictionary files are tightly encrypted to protect copyrighted vocabulary, making them completely useless outside the specific Lexicon software suite.
If you need to share a ladder logic diagram, the best target format is PDF. Exporting the layout to PDF allows anyone to view the logic gates, wiring structures, and block configurations on any device. For Lingea files, converting to TXT or CSV would be ideal for text extraction, but the aggressive encryption usually prevents this.
The .LLD format is notoriously difficult to open or convert online. Siemens uses complex internal Java serialization and custom binary structures. Standard online converters fail to process it because they lack the proprietary Siemens compilation engine required to read the logic blocks and node connections. Explain clearly why standard online converters fail to process it: they simply cannot decode the undocumented binary schema. Often, only the original software can properly read or export the data. We can inspect the file and show raw text or internal content. If our analysis detects a supported underlying or embedded format, viewing or conversion may still be possible.
Convert.Guru analyzes your LLD file, detects the exact format, and lets you read the text inside.
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If you want to convert LLD file to INDD, QXP, PUB, PMD, PM6, PM7, PM8, PM9, PM10, PM11, OMP or P65, you can use Siemens LOGO! Soft Comfort or similar software from the "PLC Ladder Logic Program" category. In the File menu, look for Save As… or Export….
To convert MDI, PUB, PDP, PM4, P65, COMIC, WEBTEMPLATE, PMD, SPUB, INDD, PM5 or QXP files to LLD, try Siemens LOGO! Soft Comfort or another comparable tool in the "PLC Ladder Logic Program" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our LLD converter.