Convert Excel to JSONL (JSON Lines)
Online Converter: Convert Excel (XLSX, XLS) file to JSON Lines (NDJSON) format
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Convert Excel spreadsheets to JSON Lines (JSONL/NDJSON) format for data pipelines, machine learning workflows, and streaming applications. Transform your XLSX and XLS files into the line-delimited format preferred by modern data tools.
Ideal for preparing spreadsheet data for ML model training, log ingestion systems, or any application that processes records one at a time.
Why Convert Excel to JSONL?
- ML Training Data: JSONL is the standard format for OpenAI fine-tuning, Hugging Face datasets, and many ML frameworks.
- Stream Processing: Enable line-by-line processing without loading entire files into memory.
- Log Systems: Ingest data into Elasticsearch, Splunk, or other systems that accept newline-delimited JSON.
- API Integration: Feed spreadsheet data into APIs and services that consume JSONL format.
Conversion Details
Each row in your Excel spreadsheet becomes a JSON object on its own line. Column headers become object keys, and cell values become the corresponding values with appropriate types (numbers, strings, dates).
Supported Formats
- XLSX: Excel 2007 and later (recommended)
- XLS: Excel 97-2003 legacy format
Format Resources
- JSON Lines - Format specification
- MS-XLSX - Excel file format specification
Related Converters
- JSONL to Excel - Convert back to Excel format
- Excel to JSON - Convert to standard JSON array
- Excel to Parquet - Convert to columnar format
Frequently Asked Questions
Which worksheet is converted?
The converter processes the first worksheet in your Excel file. For multi-sheet workbooks, save each sheet separately if you need to convert them all.
How are Excel formulas handled?
Formulas are converted to their calculated values. The JSONL output contains the data values, not the formula expressions.
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- Conversion time varies by file size; thank you for your patience.
- Limits apply to maximum conversions and file size. See available plans on the Pricing page.
- Unregistered users: up to 5 conversions/day, up to 50 conversions/month, and 10 MB per file. Sign up to extend your limits.
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