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Archive Inspector

Compression · Free Online Tool

Auto-detect zip/tar/gz format and show structure.

By EZ4Code TeamLast updated: 2026-10-29

Upload File

Upload a file to detect its archive format.

Magic Bytes

Reads the first few bytes (and ustar offset) to identify the format.

8 Formats

Detects ZIP, GZIP, BZIP2, XZ, ZSTD, LZ4, 7Z, and POSIX TAR.

Decoder Hints

Tells you which WASM library you need for formats the browser can't decode natively.

How to Use Archive Inspector

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.