Click the "Select File" button above, and choose your JL file.
You’ll see a preview, if available.
Click the "Convert file to..." button to extract text information.
Convert JL to another file type
To convert your JL file to another format, you need Julia or other Developer software.
Convert a file to JL
To convert other file formats to the "Source Code & Data" file type, you need software like Julia or a similar tool.
About JL files
The .JL extension serves two distinct but technical purposes: source code for the Julia Programming Language and JSON Lines data files.
Julia Source Code (.jl): As the native format for Julia, these files contain high-performance scripts used for data science and numerical computing. While they are plain text, they require the Julia runtime or an IDE like VS Code to execute. Users often need to convert these to PDF or HTML to share documentation, algorithms, or code snippets with non-developers who do not have the environment installed. Direct execution is restricted to users with the CLI or Pluto notebooks.
JSON Lines Data (.jl): In data engineering, .JL is frequently used as a shorthand for JSONL (newline-delimited JSON). Unlike standard JSON, these files place one object per line, making them ideal for streaming large datasets. The major constraint is that .JL files are not compatible with standard JSON parsers (which expect a comma-separated array) and cannot be opened directly in Microsoft Excel. To make this data usable for analysis or reporting, users must convert .JL to CSV, XLSX, or standard JSON format.
Convert.Guru analyzes your JL file, detects the exact format, and lets you read the text inside.
If you want to convert JL file to CSV, JSON, XML, YAML, YML, TOML, INI, CFG, CONF, DAT, DB or SQL, you can use Julia or similar software from the "Julia Source Code" category. In the File menu, look for Save As… or Export….
To convert DBF, XML, SQLITE, XLSX, SQL, TSV, ACCDB, YAML, MDB, CSV, ODS or JSON files to JL, try Julia or another comparable tool in the "Julia Source Code" category.
The JL Converter Story
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 JL converter.