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LZ-String Compressor

Compression · Free Online Tool

lz-string compress/decompress for short text in URLs/LocalStorage.

By EZ4Code TeamLast updated: 2026-10-29

Input Text193 chars

Compressed (Base64)

0 chars

Click "Compress" to run...

Pure JavaScript

Runs entirely in JS — works in any browser, even old ones without CompressionStream.

Great for Storage

Ideal for stuffing large JSON into localStorage, cookies, or short URLs.

Base64 Output

Output is safe to embed in JSON, URLs, and text fields.

How to Use LZ-String Compressor

1Enter or paste the text you want to compress.
2Select the compression algorithm (gzip, deflate, or brotli).
3Click compress to reduce the data size.
4Copy or download the compressed output.

Features

✓100% free — no signup, no subscription, no ads
✓Runs entirely in your browser — data never leaves your device
✓Fast and lightweight — instant results
✓Cross-platform — works on desktop, tablet, and mobile

Frequently Asked Questions

What compression algorithms are supported?

We support gzip, deflate, and brotli compression algorithms for text data.

Is there a file size limit?

Since tools run in your browser, the limit depends on your device memory. Most tools handle several megabytes without issues.

Can I decompress data produced by other software?

Yes. The decompression tools accept standard gzip, deflate, and brotli streams from any compliant source — command-line tools, web servers, or other libraries.

Why does the compressed output look unreadable?

Compressed data is binary, not text. Use Copy as Base64 or download it as a file — pasting raw compressed bytes into a text field will show garbled characters.