What is CSV Viewer & Editor?

CSV Viewer & Editor is a browser-based tool that lets you open, view, and edit CSV (Comma-Separated Values) files in a clean, spreadsheet-like interface. Whether you need to quickly inspect a data file, sort columns, filter rows, or make edits before exporting — this tool handles it all without requiring any software installation.

Who is it for?

Developers who need to inspect CSV data exports or API responses
Data analysts looking for a quick way to view and clean CSV files
Anyone who wants to view or edit a CSV without opening Excel or Google Sheets

Key Highlights

Works entirely in your browser — no file uploads to any server
Supports multiple delimiters: comma, tab, semicolon, and pipe
Inline editing with keyboard navigation (Tab, Enter, Escape)
Sort, search, and filter your data instantly

Privacy First: All processing happens locally in your browser. Your data never leaves your device — no uploads, no tracking, complete privacy.

Table of Contents

1. What is CSV Viewer & Editor?
- 1.1. Who is it for?
- 1.2. Key Highlights
2. How to Use
3. Features
- 3.1. Multiple Import Options
4. Frequently Asked Questions

How to Use

Import Your CSV Data

You have three flexible ways to load data into the viewer:

Upload a file — Click the upload button and select a .csv, .tsv, or .txt file. The delimiter is auto-detected.
Paste from clipboard — Copy CSV text from any source and paste it directly (when no input field is focused).
Load sample data — Click the sample button to load example data and explore the features.

View and Explore

Sort

Click any column header to sort ascending. Click again for descending. A third click restores the original order.

Search

Type in the search bar to filter rows. Only rows containing the keyword are shown, with matches highlighted.

Scroll

The header stays fixed while you scroll through large datasets for easy navigation.

Edit Your Data

Make changes directly in the spreadsheet interface with powerful editing capabilities:

Edit a cell — Click any cell to start editing. Press Enter to save and move down, Tab to move right, or Escape to cancel.
Rename columns — Double-click a column header to change its name.
Add rows/columns — Use the toolbar buttons to add new empty rows or columns.
Delete — Hover over a row number to reveal the delete button, or hover over a column header for the column delete button.

Keyboard shortcuts: Navigate efficiently using Tab (move right), Shift+Tab (move left), Enter (move down), and Escape (cancel edit).

Export

Save your work in the format you need:

Download

Click the download button to save your data as a .csv file to your device.

Copy

Click the copy button to copy the CSV text to your clipboard for pasting elsewhere.

Features

Multiple Import Options

Upload CSV, TSV, or plain text files directly from your device. The tool automatically detects the delimiter used in your file — whether it's commas, tabs, semicolons, or pipes. You can also paste CSV text from your clipboard or load built-in sample data.

Spreadsheet-like View

Your data is displayed in a clean table with row numbers, sticky column headers, and alternating row colors for easy reading. Long cell values are truncated with ellipsis to keep the layout tidy.

Sort and Search

Click any column header to sort your data. The sort cycles through ascending, descending, and original order. Numeric columns are sorted by value, not alphabetically. The global search bar lets you filter rows instantly — matching keywords are highlighted in yellow.

Inline Editing

Click any cell to edit its content directly in the table. Navigate between cells using keyboard shortcuts: Tab moves right, Shift+Tab moves left, Enter moves down, and Escape cancels the edit. Column headers can be renamed by double-clicking them.

Add and Delete

Add new empty rows or columns using the toolbar buttons. Delete rows by hovering over the row number and clicking the delete icon. Delete columns by hovering over the column header.

Column Resize

Drag the right edge of any column header to adjust its width. This is useful when cell content is truncated and you want to see the full text.

Export Options

Download your edited data as a CSV file, or copy the entire CSV text to your clipboard with one click. The export respects your chosen delimiter setting.

Your Data Stays Private: All processing happens in your browser. No uploads — files never leave your device. No tracking — we don't collect usage data. Complete privacy guaranteed.

Frequently Asked Questions

What file formats are supported?

You can upload .csv, .tsv, and .txt files. The tool supports comma, tab, semicolon, and pipe as delimiters. You can also change the delimiter manually from the toolbar dropdown.

Is there a file size limit?

Since all processing happens in your browser, the limit depends on your device's memory. The tool works well with files containing up to tens of thousands of rows. For very large files (100MB+), you may experience slower performance.

Can I edit column headers?

Yes. Double-click on any column header text to rename it. Press Enter to confirm or Escape to cancel.

How do I sort by multiple columns?

Currently, sorting is supported for one column at a time. Click a column header to cycle through ascending, descending, and original order.

Will my data be uploaded to a server?

No. All data processing happens entirely in your browser. Your files and data never leave your device. This ensures complete privacy and security.

Can I undo changes?

There is no undo feature. If you need to revert changes, you can re-upload the original file or reload the page. We recommend downloading a backup before making large edits.

Best practice: Always keep a backup of your original file before making extensive edits.

Why does my file look wrong after uploading?

This usually happens when the wrong delimiter is detected. Try changing the delimiter manually in the toolbar dropdown. For example, if your file uses semicolons instead of commas, select ";" from the delimiter options.

Check if your file uses semicolons (;), tabs, or pipes (|) instead of commas
Select the correct delimiter from the toolbar dropdown menu
The table should immediately reformat with the correct structure