Open and Explore CSV Files Online
Open a CSV in a fast, sortable table instead of squinting at raw commas. Prettify figures out the delimiter on its own, whether comma, tab, or semicolon, so you can sort columns, search across cells, and catch malformed rows, then convert to JSON when you are done. Paste or open a file to start.
A real table for your rows
The header row becomes the column names, and every other line becomes a row you can read at a glance. Click a column header to sort ascending or descending, which makes an out-of-range number or an empty required field jump out immediately.
Search runs across every cell, and only the rows currently in view are drawn to the screen, so a spreadsheet with hundreds of thousands of records keeps sorting and searching fast instead of choking the tab.
Delimiter detection and messy files
The delimiter is detected automatically, so comma, semicolon, tab, and pipe separated files all open without configuration. A dedicated parsing library, not a simple comma split, correctly interprets quoted fields, punctuation that appears inside a quoted value, and line breaks embedded within a single field.
A file with a single column and no delimiter is perfectly valid: that case is treated as a warning, not an error, so a one-column list still opens as a table instead of being rejected.
Chart it or convert it next
Once the data looks right, you can plot a column as a chart, with a single data series available for free and a second series being a Pro upgrade. Converting the whole file to a JSON array of objects is free and one click away, so exploring and reshaping happen in the same place, all on your device.
Frequently asked questions
Is the CSV viewer free?
Yes. Opening a CSV, sorting and searching the table, and converting it to JSON are all free with no account. SQL queries over the file and multi-series charts are the Pro additions.
Is my CSV uploaded to open it?
No. The file is parsed locally in your browser, so a customer export or financial report stays on your machine and is never sent to a server.
My CSV has one column and no commas. Is that a problem?
No. A single-column file with no delimiter is valid; Prettify treats the undetectable delimiter as a warning and still opens it as a one-column table.
How large a CSV can I open?
Only the visible slice of the table gets rendered at any moment, so spreadsheets with hundreds of thousands of lines still scroll and filter without stalling. What runs out first is the memory available to your browser tab, not any row count Prettify imposes.
Can I chart the data?
Yes. Plotting one column as a line, bar, scatter, or pie chart is free; adding a second data series to compare columns is a Pro feature.