Convert JSONL to Excel — Free, Private, In-Browser
Convert JSONL to Excel right in your browser. JSONL is JSON Lines (NDJSON) — one JSON object per line, ideal for streaming and append-only logs; Excel is Excel .xlsx workbooks — the format analysts and business stakeholders live in. This tool reads your JSONL file with DuckDB-WASM and writes Excellocally — your data never leaves your machine, and there’s no upload, account, or size cap beyond your browser’s memory.
Excel has no nested type, so any STRUCT/LIST (or object/array) columns are flattened to JSON text. Excel is a flat grid capped near 1,048,576 rows, and numbers are stored as doubles — integers beyond 2^53 can lose precision.
Drop a JSONL file below to preview its schema and download it as Excel. Because everything runs client-side, it works offline and keeps even sensitive data private.
Drop a file or click to browse
Drop a JSONL file — processed locally, never uploaded
Frequently asked questions
- Is my file uploaded anywhere?
- No. The JSONL→Excel conversion runs entirely in your browser via DuckDB-WASM. Your file never leaves your device.
- How large a file can I convert?
- It's bounded by your browser's available memory rather than any server limit — files in the hundreds of MB are routine. DuckDB runs single-threaded here, so very large files just take a little longer.
- Do I need an account?
- No — it's free and requires no sign-up.