Turn CSV spreadsheets into FEATHER. It is converted in your browser, so the file never leaves your device.
Drop CSV files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Drop CSV files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
Press Convert. There is nothing else to set. The work happens in this tab.
Save the result. When one file produces several FEATHER files they come as a single ZIP.
The CSV to FEATHER converter is part of this page and runs inside your browser. Your spreadsheets are never sent to ToAny or to anyone else.
Nothing has to travel to a server and back, so the conversion starts the moment you press Convert, even on a slow connection.
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
CSV carries no formatting, formulas or multiple sheets, and Excel often misreads its dates and encodings. Feather keeps column types and loads fast in pandas and R. CSV is at home in moving tabular data between systems; FEATHER is the usual choice for quickly saving a data frame between Python and R sessions.
One CSV can produce several FEATHER files; when it does, they are offered together as a ZIP download.
Each column gets one type chosen from all of its values: a column is numeric only if every non-empty cell is a number, and anything mixed, or a value such as a ZIP code with a leading zero, stays text. A workbook with several sheets gives one file per sheet.
CSV is a table written as text: one row per line, values separated by commas. Every spreadsheet and database can import and export it, but it holds one sheet only and no formatting, formulas or data types.
Opens in Excel, Google Sheets, Numbers, databases and any text editor
CSV converterFeather was created to exchange data frames between Python and R quickly. Version 2 is the Apache Arrow file format with a different name, version 1 an earlier, simpler layout. It stores column types exactly and reads much faster than CSV.
Opens in pandas, R and other analytics tools; not Excel
FEATHER converter| CSVCSV spreadsheet | FEATHERFeather table | |
|---|---|---|
| Stands for | Comma-Separated Values | Feather |
| Type | Plain-text table | Columnar data file |
| Compression | None | None by default (LZ4 or Zstandard in version 2) |
| Introduced | The 1970s, by no single author (described in RFC 4180) | 2016, by Wes McKinney and Hadley Wickham |
| Opens in | Excel, Google Sheets, Numbers, databases and any text editor | pandas, R and other analytics tools; not Excel |
| Best for | Moving tabular data between systems | Quickly saving a data frame between Python and R sessions |
| File extension | .csv | .feather |
No. The CSV to FEATHER conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
The values are kept. Anything FEATHER has no way to express, such as formatting, formulas or nesting, is simplified or left out.
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the CSV file, press Convert and save the FEATHER. There is nothing to install.
Yes. Data files up to 300 MB are accepted; a larger file is refused with a message. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.