Large-file first.
Byte-offset indexing and virtual row rendering keep multi-gigabyte CSV files responsive without loading everything into memory.
Native macOS app
Big CSV files. Opened fast.
Nanum CSV Viewer helps you inspect, filter, analyze, chart, and pivot large CSV, Excel, and SQLite files locally on your Mac.
Notarized Developer ID release for macOS 14 or later. Mac App Store version is currently waiting for review.
| Date | Region | Segment | Revenue |
|---|---|---|---|
| 2026-01-04 | North America | Enterprise | 42,180 |
| 2026-01-05 | Korea | Research | 18,420 |
| 2026-01-06 | Europe | Public Sector | 24,900 |
| 2026-01-07 | Japan | Healthcare | 31,760 |
| 2026-01-08 | Australia | Education | 12,550 |
| 2026-01-09 | Singapore | Finance | 36,230 |
Everything you need to read the file before it reads your day.
Built for large data workflows, with a virtual table, background indexing, facet filtering, statistical charts, data quality checks, pivot tools, and Excel/SQLite import.
Filter by clicking.
The Facets panel shows per-column histograms and top values beside the grid; click a bar to cross-filter, and combine with text, regex, fuzzy, and header filters.
Charts and statistics.
Seven statistical chart windows — histogram with KDE, boxplot with ANOVA, scatter with regression, correlation heatmap, Q-Q, time series, and Pareto — plus descriptive statistics, frequency, ANOVA, and normality tests.
Trust your data.
The Data Quality profiler scans the whole file for missing-value sentinels, mixed types, duplicated keys, and ragged rows, then scores it and exports Markdown, HTML, or JSON reports.
Opens more than CSV.
Excel .xlsx/.xlsm workbooks with a multi-sheet picker and SQLite databases with a table picker, alongside UTF-8, UTF-8 BOM, and CP949/EUC-KR CSV. Pivot tables and Swift Charts output included.
Designed for macOS.
Native menus, tabs, drag and drop, clipboard import, light and dark appearance, and a notarized Developer ID release.
Your CSV stays on your Mac.
Nanum CSV Viewer is a local desktop app. It opens files you choose, builds local indexes, and does not need a cloud service to inspect or analyze your data.
Nanum CSV Viewer v1.9.0
Developer ID signed, notarized, and stapled. SHA-256: 3fc618bae73bca1b083b6ae7d963c139a899589e648a5003d75dd987985c8fe5