Turn a CSV file into Parquet. 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 PARQUET files they come as a single ZIP.
The CSV to PARQUET 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.
Parquet files are much smaller than the CSV they came from and carry the type of every column, so analytics tools such as DuckDB, Spark and pandas load them quickly. Converting a CSV is usually the first step of getting a dataset into a data warehouse.
One CSV can produce several PARQUET 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 converterParquet stores a table column by column, with the type of every column recorded in the file and each column compressed on its own. That makes it small and quick to scan for analysis, which is why data lakes and warehouses use it. It cannot be read in a text editor or a spreadsheet.
Opens in pandas, Spark, DuckDB, BigQuery, Snowflake and other analytics tools; not Excel
PARQUET converter| CSVCSV spreadsheet | PARQUETApache Parquet table | |
|---|---|---|
| Stands for | Comma-Separated Values | Apache Parquet |
| Type | Plain-text table | Columnar data file |
| Compression | None | Lossless (per column: Snappy, Zstandard, gzip and others) |
| Introduced | The 1970s, by no single author (described in RFC 4180) | 2013, by Twitter and Cloudera, now the Apache Software Foundation |
| Opens in | Excel, Google Sheets, Numbers, databases and any text editor | pandas, Spark, DuckDB, BigQuery, Snowflake and other analytics tools; not Excel |
| Best for | Moving tabular data between systems | Large analytical datasets |
| File extension | .csv | .parquet |
No. The CSV to PARQUET 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 PARQUET 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 PARQUET. 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.