Fast viewer for large CSV files

  • Forever free. No strings attached.
  • Up to 500 million rows loaded from one or multiple files.
  • Best for exploratory analysis and querying CSV datasets.
Version 2.1 build 1 for Windows; 7,622KB (zipped). For 64-bit Windows only.

Advanced filtering

Best-in-class filtering at your fingertips.

Query data, explore relationships in data, and spot oddities by using best-in-class filtering. CSViewer conveniently indicates values that are excluded from the current selection to provide a better insight into data.

Aggregates and charts are updated immediately when a filter is applied or changed.

Instant profiling

Null counts, uniques, min/max values, aggregates, etc. for every column.

With CSViewer, you can quickly understand data by instantly profiling the whole dataset, or any column, or even individual values. See uniques, spot outliers, and detect data quality issues at a glance.


Save the necessary subset of data for further action.

Export the filtered subset of rows into another CSV file for sharing or use in another application.

Alternatively, export into the native for CSViewer .dset file format to save data together with filters and charts. Data in the .dset format is compressed and pre-processed and therefore is loaded in CSViewer 10-100 times faster than CSV files.

Pre-configured data views

Save time by re-using filters and charts

If you frequently view and analyze the same file or dataset, you can save the data source configuration, filters, and charts as a view (a .csview file). Open a view and change its data source to re-use filters and charts for another file or dataset.

Load collections of multiple uniform CSV files at once. It’s as easy as loading a single file.
Visualize data using built-in charts to understand trends and spot outliers.
With one click, pass data for transformation in EasyMorph, a powerful data preparation / ETL tool. It has a free edition.

Answers to some Frequently Asked Questions:

Is there a version for Mac?
CSViewer is for 64-bit Windows only.
Can CSViewer be used in a commercial organization?
Yes, you can use CSViewer in a commercial organization free of charge.
Why is it forever free? How do you finance its development?
CSViewer is made from the components of EasyMorph, a paid application (although, with a free edition) for data preparation, ETL, and API automation without coding. EasyMorph is easy-to-use and is suitable even for non-technical people. You should try it!
I have a question/suggestion. How can I contact you?
We recommend posting questions and suggestions on the Community forum. If your question is not suitable for a public forum, ask us directly. Please mention CSViewer in your question as we have multiple software products.