Check your CSV before you use it.

Paste data or open a file. Review the result, then download.

No file selected

Parsing settings

EncodingSeparatorKeep values as textControls JSON output. CSV cannot declare column types.

CSV input

You can also drop a file here. Up to 5 MiB.

Table preview

Your table preview will appear here.

Open a file, paste data, or try the sample.

No input yet. Add data to begin.

Download settings

File name

Output encoding: UTF-8SeparatorLine endingsAdd UTF-8 BOM

Downloads become available after the data is checked.

Before opening in Excel

CSV cannot declare column types. Review ID and date columns before import.

Understand CSV quoting Protect long IDs

View and validate CSV without uploading a file

RowNook opens small CSV files in your browser and checks record structure, including quoting and field counts. It reports errors instead of silently skipping malformed records. It does not verify the meaning or accuracy of your data.

How to use this tool

Open a file or paste CSV, select the encoding and separator, then review the preview and diagnostics before downloading the complete result. Preview search does not filter the download.

Synthetic example input

id,name
00123,"Lee, Sam"

Example result

id | name
00123 | Lee, Sam

Limits and privacy

Input is limited to 5 MiB, 50,000 records, 200 columns and 1,000,000 cells. File processing runs locally in your browser and requires JavaScript.