What is a data compressor?
A data compressor reduces file size using lossless algorithms — the exact original can be restored. Click-Compress specializes in text and structured formats like CSV and JSON.
Free online tool
Free Online Data & Text Compressor
Losslessly shrink CSV, JSON, XML, and plain text files.
Click-Compress is a free data compressor for structured text files — CSV exports, JSON APIs, XML configs, logs, Markdown, and HTML. Unlike zip tools, we optimize the file itself with maximum-effort lossless compression.
Repetitive structured data often compresses 50–90%. Decompress anytime to get the exact original bytes back — perfect for archives, backups, and sharing large exports.
Supported formats
TXT, CSV, JSON, XML, HTML, Markdown, LOG
Typical savings
50–90% on structured text
Why use Click-Compress?
- Lossless compression — byte-perfect restore
- Deep compression for CSV, JSON, and XML
- Ideal for database exports and API dumps
- Browser-based — files stay on your device
- Works alongside PDF, video, and document tools
How to compress in 3 steps
Step 01
Upload your data file
Choose CSV, JSON, XML, TXT, or another supported text format.
Step 02
Maximum-effort lossless pass
Click-Compress tries multiple lossless strategies and keeps the smallest valid output.
Step 03
Download compressed file
Share or store the smaller file. Decompress later to restore the exact original content.
Frequently asked questions
Can I compress CSV and JSON files online?
Yes. Upload CSV or JSON exports and download a smaller losslessly compressed version, often half the size or less.
Is data compression lossless?
Yes. Strict lossless mode preserves every byte. This is different from video or PDF optimization, which may trade some quality for size.
How is this different from ZIP?
ZIP wraps files in an archive. Click-Compress optimizes the file content directly and can apply format-specific strategies for text-heavy data.
Other free compressors
Ready to compress your file?
Open the workbench, upload your file, and download a smaller version in minutes.
Start compressing free