CSV Formatter & Viewer
Parse, edit, visualize and convert CSV data with CSV to JSON conversion support
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About CSV Formatter & Viewer
What is CSV Formatter & Viewer?
CSV Formatter & Viewer is a professional online tool designed for data analysts, developers, and Excel users. It provides a secure, fully browser-based environment for parsing, validating, and visually viewing CSV (Comma-Separated Values) files. Unlike simple text editors, this tool offers an interactive grid view that allows you to easily sort, filter, and analyze tabular data.
Understanding CSV Format Specification (RFC 4180)
CSV is a widely supported data interchange format that stores tabular data (numbers and text) in plain text. While it appears simple, robust CSV processing requires following specific rules, typically defined by RFC 4180:
- Each record is located on a separate line, delimited by a line break (CRLF).
- The last record in the file may or may not have an ending line break.
- Fields containing line breaks, double quotes, and commas must be enclosed in double quotes.
- If a field is enclosed in double quotes, any double quotes appearing inside the field must be escaped by preceding it with another double quote.
Key Features
- Smart Parsing: Automatically detect or allow custom delimiters (comma, tab, pipe, semicolon).
- Interactive Grid: View data in a sortable, responsive table layout.
- Data Conversion: Instantly convert CSV to JSON object arrays.
- Statistical Analysis: Real-time statistics on row count, column count, and total data cells.
- Data Validation: Check for malformed CSV rows and quote issues.
How to Use
- Paste your CSV data into the input editor, or load a sample.
- Adjust configuration if needed (delimiter, header row, quote character).
- Click "Format / View" to render the data table.
- Use "Export JSON" to get a JSON format representation of the data.
Frequently Asked Questions
Is my CSV data secure?
Yes, absolutely secure. All processing is done via JavaScript in your browser client. Your data is never sent to our servers.
Can I convert Excel to CSV?
Yes. Save your Excel file as .csv, then open it with a text editor and copy the content here; or directly copy cells from Excel and paste here (by adjusting the delimiter to tab).
How do I handle TSV files?
Select "Tab (\t)" in the delimiter configuration to correctly parse TSV (Tab-Separated Values) files.
Can I convert JSON back to CSV?
This tool focuses on CSV to JSON conversion. For reverse conversion, please use the dedicated "JSON to CSV" tool in the link below.
Is there a file size limit?
Since it runs in the browser, the limit depends on your computer's memory (RAM). It can typically handle files of several megabytes with ease.
Does it support different encodings?
This tool works with UTF-8 strings. If your file uses a different encoding (such as GBK), please convert it to UTF-8 before pasting.
Is this tool free?
Yes, it is 100% free for both personal and commercial use.