Parquet to CSV Converter
Convert Apache Parquet files to CSV without Spark or pandas. Timestamps in ISO form, nested columns as JSON, UTF-8 output. Nothing stored.
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The data-lake format, without the data-lake tooling
Parquet is what modern data infrastructure speaks: Spark jobs write it, warehouses export it, S3 buckets fill up with it. It is columnar, compressed and excellent for machines - and completely opaque the moment someone just needs to see the rows. The usual answer is to open a notebook and import pandas. This is the faster answer: drop the file, get a CSV.
Types are rendered the way a human downstream actually wants them: timestamps in ISO form, decimals exact, booleans as true and false, and nested lists or structs as JSON within their cell rather than silently mangled. Need it in a workbook instead? Parquet to Excel. Need it queryable? Chain through CSV to SQLite.
Production data, handled like production data
A Parquet file is rarely sample data - it is an export from a live system, often rows about real users. Here it is read entirely in memory, never written to disk, never logged, and deleted the moment your download is delivered. Hard caps on rows, columns and output size mean a hostile or over-compressed file fails cleanly instead of expanding without bound, and every text cell passes the same spreadsheet formula-injection guard the rest of the site’s data tools use.
Running this in a pipeline? The conversion is on the API at /api/convert/parquet-to-csv, with async jobs and signed webhooks for scheduled exports.
How to Convert PARQUET to CSV Online
Turning a PARQUET file into CSV is straightforward here - upload, convert, download. Your file is processed privately in memory and deleted the instant the CSV is ready.
Drag and drop your file into the upload area, click to browse your device, or paste a URL to a file hosted online. You can upload files up to 250 MB and batch convert up to 200 files at once.
Once uploaded, the conversion from PARQUET to CSV starts automatically. The process runs entirely in an isolated environment - your data never leaves the secure pipeline.
Your converted file is ready instantly. Click the download button to save it to your device. The file is deleted from memory immediately after download.
Private by design, not as an afterthought
Most online converters upload your files to a server, keep them for days, and may mine them for AI training or resale. PrivConvert was built the opposite way - around your privacy.
Every conversion runs in its own locked-down process with no network access, so files can never leak or interfere with one another.
Your files are handled entirely by automated code. No staff, partner or AI model ever reads, stores or trains on your data.
Files are processed in volatile memory (RAM) and purged the instant your download is ready - nothing is ever written to disk, cached or backed up.
Every upload and download is protected with TLS 1.3, so your spreadsheet cannot be intercepted on the way to the server or back to you.
PARQUET vs CSV - Format Comparison
| Feature | PARQUET | CSV |
|---|---|---|
| File extension | .parquet | .csv |
| Supported by PrivConvert | Yes (as input) | Yes (as output) |
| Privacy-safe conversion | In-memory, zero storage | |
| Max file size | 250 MB per file | |
| Batch support | Up to 200 files at once | |
Trusted by thousands of users
Professionals reach for PrivConvert when the spreadsheet they are converting is sensitive and cannot be left sitting on someone else’s server.