How to view a CSV file online
Drop in a CSV or TSV file, confirm the detected delimiter and encoding, then search, sort, or filter the virtualized table.
CSV Viewer
Open, explore, search, and inspect CSV or TSV files directly in your browser. Nothing is uploaded.
Drop CSV Here
Choose one .csv or .tsv file, up to 50 MB.
Processing File0%
Search, sort, and filters apply to the loaded preview.
No Matching Rows
Clear the search or filter to see your data.
Free Online CSV Viewer & Explorer
Inspect tabular data without opening a spreadsheet.
A CSV viewer turns comma- or tab-separated text into a readable table. TextLumo keeps every byte on your device and treats every field as text, preserving values such as 00123 and 9007199254740993.
CSV vs TSV
CSV normally uses commas; TSV uses tabs. Both can contain quoted fields, empty values, non-ASCII text, and embedded line breaks.
Privacy and local processing
The file is read by browser APIs and parsed in a dedicated Worker. Its contents are never submitted to TextLumo or a third party.
CSV Viewer features
Header and delimiter controls, encoding selection, stable string sorting, Unicode search, column filters, issue reporting, full-value inspection, and virtual scrolling.
Common CSV problems
Unclosed quotes, duplicated or empty headers, uncertain delimiters, wrong encodings, and inconsistent field counts can make rows appear incorrect. The viewer reports these issues without silently dropping records.
Worked example
See CSV Viewer in action.
Open, search, sort, and filter CSV or TSV files privately in your browser.
sku,name,price 00123,Ada,1.00
2 rows · 3 columns · leading zeros preserved
Real questions, clear answers
CSV Viewer FAQ
Are CSV files uploaded to a server?
No. The File API, a dedicated browser Worker, and the virtual table all run on your device. File names and cell values are not sent to TextLumo.
Does the viewer preserve leading zeros and large integers?
Yes. Every field remains a string, so values such as 00123, 1.00, and 9007199254740993 are displayed exactly as parsed.
How are large CSV files handled?
Files are decoded and parsed in chunks in a Worker. The viewer scans the file, keeps a bounded preview of up to 100,000 records, and renders only visible rows.
Can I open TSV or semicolon-separated data?
Yes. Automatic detection checks comma, tab, semicolon, and pipe delimiters, and you can choose a delimiter manually when detection is uncertain.