LZ4 Decompressor
Compression · Free Online Tool
LZ4 format decompression (lz4js) for fast decompression.
04 22 4D 18) and reports frame info; if the input is actually gzip, it decompresses it transparently.Click "Decompress" to run...Frame Detection
Sniffs the LZ4 magic bytes and reports the flag/BD descriptor so you know what you have.
Gzip Fallback
If the bytes are actually gzip, decompresses them transparently via DecompressionStream.
WASM Upgrade Path
Tells you exactly which WASM package to add to enable real LZ4 decoding.
How to Use LZ4 Decompressor
- 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.
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LZ-String Compressor
lz-string compress/decompress for short text in URLs/LocalStorage.
LZUTF-8 Compressor
LZUTF-8 compress/decompress optimized for UTF-8 text.
Learn the concept
Learn the concept
Understand the programming ideas behind this tool.