Open big CSV files online
without crashing anything.
Drop in a file that's too big for Excel or Google Sheets. openbigcsv.com parses it in your browser, keeps it off any server, and lets you search, sort, and export it in seconds.
Free up to 300,000 rows in this tab. For tens of millions of rows and warehouse data, that's Row Zero, free too.
Everything above runs locally in your browser tab. Nothing is uploaded, logged, or stored — see how this works.
Built for files that break spreadsheets
Excel tops out around 1,048,576 rows and slows down long before that. Google Sheets caps at 10 million cells. openbigcsv.com skips both limits by never loading the whole file into a spreadsheet grid at once.
Nothing leaves your browser
Your file is read and parsed on your machine with a background worker thread. No upload, no server round-trip, no copy of your data anywhere else.
Renders only what's on screen
Instead of drawing every row into the page, the grid renders a window of visible rows and swaps them as you scroll — so 250,000 rows scroll as smoothly as 250.
Search, sort, and export
Filter across every column at once, click a header to sort, and export exactly the rows you're looking at as a clean CSV.
Three steps, zero installs
Drop in your file
Drag a CSV, TSV, or TXT file onto the page, or click to browse. Parsing starts immediately, streamed in chunks.
Search, sort, explore
Type into the search box to filter every column at once, or click a column header to sort by it.
Export, or move to Row Zero
Download the filtered view as CSV, or continue the same file in Row Zero for pivot tables, charts, and tens of millions of rows.
Row Zero picks up where this tool stops
openbigcsv.com is built by Row Zero, a cloud spreadsheet that connects live to Snowflake, Databricks, Redshift, and BigQuery and handles billion-row datasets without exporting ungoverned CSVs in the first place.
Open the same file, further
Row Zero's free plan opens 10s of millions of rows, keeps 400+ Excel-compatible functions, and includes pivot tables and an AI chat agent.
Skip the CSV export entirely
Connect straight to your warehouse instead of exporting a file at all — every CSV export is a copy of your data that someone now has to secure.
Enterprise-ready when you need it
SOC 2 Type II, HIPAA, and GDPR compliant, with a Zero Data Retention architecture and support for 1 billion+ row datasets on Enterprise.