# A Free, Local-First JSONL Viewer and Editor for Large Files

> Free online JSONL viewer and editor for 1GB+ JSONL/NDJSON files, with validation, converters, and no upload or sign-up.

- Canonical: https://listedpress.com/publications/a-free-local-first-jsonl-viewer-and-editor-for-large-files
- Markdown: https://listedpress.com/publications/a-free-local-first-jsonl-viewer-and-editor-for-large-files.md
- Site: Listed Press (https://listedpress.com)

Product: jsonl.co
Project: [jsonl.co](https://listedpress.com/projects/jsonl-co)
Published: 2026-11-07
Plan: nofollow
Categories: [Data](https://listedpress.com/categories/data), [Developer tools](https://listedpress.com/categories/developer-tools)
Tags: [JSONL](https://listedpress.com/tags/jsonl), [JSONL viewer](https://listedpress.com/tags/jsonl-viewer), [NDJSON](https://listedpress.com/tags/ndjson)
Canonical: https://listedpress.com/publications/a-free-local-first-jsonl-viewer-and-editor-for-large-files
Cite: https://listedpress.com/publications/a-free-local-first-jsonl-viewer-and-editor-for-large-files
## Direct answer
Free online JSONL viewer and editor for 1GB+ JSONL/NDJSON files, with validation, converters, and no upload or sign-up.
jsonl.co is a free online viewer and editor for JSONL (JSON Lines / NDJSON) files. It streams files of 1GB+ in the browser, rendering visible rows with syntax highlighting, real-time line-by-line validation, and a side-by-side raw and parsed view.

Everything runs locally in the browser: files are never uploaded, and no account is needed. Users can edit or delete lines, find and replace text, and export their work. The site also includes converters for JSONL, JSON, CSV, Excel, and YAML, along with a formatter, validator, splitter, merger, and JSON flattener.
Nofollow link: [jsonl.co](https://jsonl.co)

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