Reduce File Size Online

Reduce the size of CSV, JSON, XML, YAML and Parquet files with gzip. Already-compressed files like Excel shrink very little. Free, in your browser.

Quick answer: Shrink JSON, CSV, XML, YAML and Parquet files with gzip, or open a .gz file.

How to use the Reduce File Size Online

Shrink JSON, CSV, XML, YAML and Parquet files with gzip, or open a .gz file.

The File Compressor shrinks files with gzip in your browser and opens .gz files you receive. Text formats such as CSV, JSON, XML and YAML usually shrink by 70 to 90 percent, which saves storage and speeds up transfers. It handles several files at once and never uploads them, so you can compress logs or exports that contain private data.

Choose Compress or Decompress
Drop one or more files
Download the result

Tips

Text formats such as CSV, JSON, XML and YAML often shrink by 70 to 90 percent.
Parquet is already compressed, so it shrinks only a little.
Compress several files at once: each one gets its own .gz file.

Example

Input: report.csv (50 MB)

Output: report.csv.gz (8 MB)

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Who uses Data Utility

Frequently asked questions · Data format benchmark

Frequently asked questions

Why did my Excel file barely shrink?

.xlsx files are already compressed, so gzip saves little. Text formats like CSV and JSON shrink the most.

Is quality lost?

No. Gzip is lossless and the original is restored exactly.

What is gzip?

A common compression format. Most tools, databases and programming languages can read .gz files.

How do I open a .gz file?

Use the Decompress tab here, or double-click it on Mac and Linux, or use 7-Zip on Windows.

What does the File Compressor do?

It shrinks files with gzip (.gz) in your browser and opens .gz files. Text formats such as CSV, JSON, XML and YAML often shrink by 70 to 90 percent. Parquet is already compressed, so it shrinks only a little.

File Compressor: Gzip JSON, CSV, XML, YAML, Parquet: Compress JSON, CSV, XML, YAML and Parquet files with gzip, or open .gz files. Shrink files by up to 90% in your browser. Nothing is uploaded.
Gzip Compress Files Online: Compress any file with gzip online and make it up to 80 percent smaller. Works for CSV, JSON, XML, YAML and Parquet. Free, in your browser.
Compress a CSV File Online: Compress a CSV file online with gzip and cut its size a lot, often by 70 to 90 percent. Free, in your browser, nothing is uploaded.
Compress a JSON File Online: Compress a JSON file online with gzip to make it much smaller for sharing or storage. Free, in your browser, nothing is uploaded.
Open a .gz File Online: Open a .gz file online and get the original CSV, JSON or text back. Free, no software to install, nothing is uploaded.
Open .gz Files Online (Gunzip): Open and decompress .gz files online without extra software, and get your original CSV, JSON or text file back. Free, in your browser.