Open a CSV file
See what is really in the file. Leading zeros survive, dates are not invented, and the delimiter and encoding are worked out for you. Nothing is uploaded.
- Processed on your device
- No upload, no waiting
- No signup, no watermark
How it works
Drop the file in
CSV, TSV, or anything separated by semicolons or pipes — the separator is detected automatically.
Read it as a table
Sortable, searchable, with row and column numbers. Every value is shown exactly as stored.
Find what you need
Filter rows, jump to a column, and see which cells are empty or ragged.
Frequently asked questions
Is my file uploaded?
No. The file is read on your own device by code that runs inside this page. Nothing is uploaded, nothing is stored, and it works with the Wi-Fi switched off once the page has loaded. A CSV is usually a customer list, an export or a finance report, which is exactly the kind of file that should not be handed to a stranger's server.
Why does Excel ruin my CSV?
Because Excel converts as it opens, without asking. A product code of 00123 becomes the number 123 and the zeros are gone for good. A part number like 5-3 becomes 5 March. A long order number becomes 1.23457E+14. A German CSV separated by semicolons lands entirely in column A. None of this is in your file — it is what Excel did to it on the way in. This viewer shows every value as text, exactly as stored, so you can see what you actually received.
What separators and encodings work?
Commas, semicolons, tabs and pipes, detected by looking at the file rather than by its extension — a "CSV" exported by a German system is usually semicolon-separated. Encoding is detected too: UTF-8 with or without a byte-order mark, UTF-16, and the Windows-1252/Latin-1 files that older systems produce. If the encoding is wrong you get "é" where "é" should be, and the page lets you change it.
Does it handle quoted fields with commas in them?
Yes — properly, to RFC 4180. A field wrapped in quotes can contain commas, line breaks and escaped quotes, and all three are handled. Splitting on commas without respecting quotes is the classic CSV bug, and it silently shifts every column after the offending field.
How large a file can it open?
Your device's memory rather than an upload cap — files of many megabytes and hundreds of thousands of rows are fine. Only the rows on screen are drawn, so scrolling stays smooth on a large file.
Can I edit or convert it?
This page is for reading. To convert, our CSV to Excel and CSV to JSON tools do that in the browser too, and they keep leading zeros as text rather than letting a spreadsheet eat them.