Gzip Decompress Online

Decompress gzip-encoded data instantly. Paste Base64-encoded gzip content or upload a .gz file to get the original text.

Compressed Input

Upload .gz

Decompressed Output

Decompressed output will appear here

About Gzip:

• Uses DEFLATE compression algorithm
• Common for HTTP compression
• File extension: .gz
• All processing happens in your browser

Instant Gzip Decompression

Decompress gzip-encoded data directly in your browser. Works with Base64-encoded strings or raw .gz files. All processing happens locally, ensuring your data remains private and secure.

GZIP Decoder

How this Gzip Decompress Online works

This decompression tool decodes gzip-formatted data using the pako library's implementation of the DEFLATE algorithm. The tool accepts Base64-encoded gzip strings or raw .gz file uploads, automatically detecting the input format and processing accordingly. Gzip compression includes header metadata with original filename, timestamp, and CRC32 checksum for integrity verification.

The decompression engine validates the gzip magic bytes (1f 8b) before processing, then inflates the compressed data stream through Huffman decoding and LZ77 dictionary reconstruction. The tool handles various compression levels from fast to maximum, producing identical output regardless of the original compression settings. Large files decompress progressively to maintain browser responsiveness.

All processing occurs entirely in your browser using client-side JavaScript, ensuring complete privacy for sensitive compressed data. This makes the tool suitable for debugging API responses, extracting log archives, or processing compressed configuration files without uploading data to external servers.

How to Use

Input compressed data

Paste Base64-encoded gzip data or upload a .gz file.

Automatic decompression

The tool instantly decompresses your data using the DEFLATE algorithm.

Get your output

Copy the decompressed text or download it as a file.

Example Usage

A simple Base64-encoded gzip string decompressed to plain text.

Input

H4sIAAAAAAAAA0tMTAYAVai1CgMAAAA=

Output

test

Frequently Asked Questions

What is Gzip compression?

Gzip is a file format and software application used for file compression and decompression. It uses the DEFLATE algorithm and is commonly used for compressing web content, log files, and data transfers.

What formats does this tool accept?

You can paste Base64-encoded gzip data directly, or upload a raw .gz file. The tool automatically detects the input format and decompresses accordingly.

Is there a file size limit?

For browser performance, we recommend files under 10MB. Larger files may cause slower processing or browser memory issues.

Is my data secure?

Yes, all decompression happens locally in your browser. Your data is never sent to any server, ensuring complete privacy.

What if decompression fails?

Ensure your input is valid gzip-compressed data. If using Base64, make sure it's properly encoded. The tool will show an error message if the data cannot be decompressed.

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The Gzip Decompress Online is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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