LZW compression

Compress and decompress text using the LZW (Lempel-Ziv-Welch) algorithm directly in your browser.

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About This Tool

This online tool implements the LZW (Lempel-Ziv-Welch) compression algorithm, a lossless data compression method widely used in formats like GIF and TIFF. You can either paste text directly or upload a text file, then choose to compress it (reducing size by replacing repeated patterns with dictionary codes) or decompress previously compressed LZW data back to the original text. The tool works entirely client-side in JavaScript, ensuring your data never leaves your browser. Results show compressed data in hexadecimal format, original vs compressed size comparison, and the ability to verify decompression.

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How to Use

Enter text in the textarea or drag/drop a text file into the upload zone.
Select 'Compress' to reduce text size using LZW or 'Decompress' to restore compressed data.
Click the 'Compress' or 'Decompress' button to process.
View results including compressed data, size statistics, and decompressed verification.

Frequently Asked Questions

Find Quick Answers

What is LZW compression?

LZW (Lempel-Ziv-Welch) is a lossless data compression algorithm that replaces repeated sequences of characters with shorter codes, building a dictionary dynamically during compression.

Does this tool work with binary files?

No, this implementation works with text data only (UTF-8). For binary files, LZW would need byte-level handling which isn't supported here.

Is my data sent to a server?

No, all processing happens locally in your browser using JavaScript. Your data never leaves your device.

What format is the compressed output?

Compressed data is shown as hexadecimal codes representing dictionary indices. You can copy this to use elsewhere.

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