CSV to Parquet Converter
CSV to Parquet conversion turns a plain-text table into a typed, compressed file designed for analytics. Upload one or more CSV files and download the Parquet results for free, with no signup required.
Convert files
Each converted file downloads automatically to your browser.
Drop CSV files here or click to upload
Your files are uploaded to Loam only for conversion
How CSV to Parquet conversion works
Your browser uploads each CSV to Loam. Loam infers supported column types, writes a compressed Parquet file, and returns it for download. Files are not added to an account or saved as workspace data, and source and output files are cleaned up automatically.
You do not need an account, email address, Python environment, or desktop data tool. Loam does not set an application-level file-size cap. Files can contain up to 1,024 columns and remain subject to browser capacity, service capacity, and request deadlines.
Why convert CSV to Parquet?
CSV stores values as plain text and works almost everywhere. Parquet stores typed data by column and compresses it, which makes it a better handoff for many analytics tools and pipelines. Loam infers supported column types from the CSV and writes the Parquet output with Zstandard compression by default.
Check the source in the CSV viewer or inspect the converted result in the Parquet viewer. Need a plain-text file again? Use the Parquet to CSV converter.
Convert, then work from the real rows
File conversion prepares data for another system. When you want answers from the data, open chat with your data and upload a supported file there. Loam uses the grounding pattern so your AI answers start from real rows instead of a guess.
Frequently asked questions
Ask questions after conversion
Open Loam's chat tool and upload a supported file to ask questions in plain English. Your AI answers from the rows you provide.