CSV Preview

A privacy-first CSV viewer and editor that runs entirely in your browser.

Live at csvpreview.com.

Open a .csv file and explore it instantly — sort, filter, edit and export — without uploading anything. Parsing happens on your device. There are no accounts, no servers touching your data, and your current sheet is kept locally in your browser so you can pick up where you left off.

What the site offers

• The viewer — open a CSV from your computer, drag and drop one in, paste CSV straight from the clipboard, or start from a blank sheet. Toggle the first row as a header so it stays pinned while you scroll, sort any column, filter rows by value, search or numeric comparison, edit cells in place, delete rows, copy a selection, and download the result.
• Free tools — in-browser converters that never upload a file: CSV to Excel (merge one or many CSVs into a single .xlsx, or convert each separately) and Excel to CSV (every worksheet becomes its own CSV, downloadable as a zip).
• Ready-made datasets — 40+ curated CSVs across nine categories (geography, transport, economics, history, food & drink, animals & nature, science, language & culture, architecture), each opening directly in the viewer.

Example datasets

• World Population by Country & Territory — 239 countries and territories with population, % of world share and census dates.
• S&P 500 Companies — 503 constituents with ticker, sector, sub-industry, headquarters and date added.
• Periodic Table Elements — every element with atomic number, symbol, group, block, atomic mass and discovery details.
• Busiest Airports and World Airports — traffic rankings and IATA/ICAO airport codes.

Privacy by default

No uploads. No accounts. No servers. Works offline.

More on the story behind the app on the about page.