About This Tool
CSV Viewer reuses the local Papa Parse library and keeps every record as an array indexed by column position. Duplicate headers cannot overwrite data. Only a limited preview is rendered to keep large files from creating excessive DOM nodes.
How to Use It
- Paste CSV or select a UTF-8 CSV file to read locally.
- Check the delimiter and First row is a header options.
- Click View Table to inspect record counts, columns, and file information.
- Scroll inside the table and check any message about preview limits.
Examples
- name,age,city followed by Tom,20,Tokyo creates three columns and one data record.
- In "Smith, John",30,"New York", the quoted comma is part of the field.
- name,name,age is displayed by column position, preserving both columns named name.
Rules and Limits
Uses Papa Parse 5.7.0 to handle quoted fields, doubled quotes, embedded line breaks, CRLF, and empty fields. The first row is a header by default; records remain arrays. The preview is limited to 500 rows, 100 columns, or 10,000 cells, whichever comes first, with an explanation when truncated. Input limits are 2 MiB, 100,000 records, 500 columns, and 500,000 cells. Exceeding a processing limit produces an error instead of silently dropping data.
Common Uses
- Inspect column positions and contents in exported CSV files.
- View UTF-8 data with multilingual text or emoji.
- Troubleshoot quotes, delimiters, and duplicate headers.
Privacy
Text processing, file reading, conversion, and previews all run locally in this browser. Input is not uploaded or automatically saved. No backend, database, online API, or third-party CDN is used. Copying and downloading also happen locally.
FAQ
Are CSV files uploaded?
No. Files are read locally in your browser without form uploads, server conversion, or online APIs.
What if a field contains commas or line breaks?
Standard CSV encloses these fields in double quotes and doubles any quotes inside them. The existing parser handles these rules.
Why are some rows missing from the preview?
The preview limits rows, columns, and cells to keep the page responsive. Statistics and notices distinguish parsed data from the portion displayed.
Are duplicate headers supported?
Yes. Columns are displayed by index, so repeated names cannot overwrite each other.
Which file encodings are supported?
Files are read as UTF-8, with an optional UTF-8 BOM. Convert other encodings first; garbled text is not a successful parse.