What is Gzip Compression Checker?
Gzip Compression Checker inspects Gzip header magic bytes (0x1F 0x8B) and measures compression efficiency.
How to use Gzip Compression Checker
Upload a Gzip file or Base64 data to verify header validity and view uncompressed size.
Key features
- Validates Gzip header magic bytes
- Calculates compression ratio
- 100% client-side operation
Common use cases
- Verifying web server Gzip response assets
Technical details & standards
Parses Gzip headers and DEFLATE blocks client-side.
Frequently asked questions
What are Gzip magic bytes?
Gzip files start with 0x1F 0x8B hex header bytes.
Is my data safe?
All processing happens entirely in your browser. Your data never leaves your device and is never sent to or stored on a server.
Does it work offline?
Yes. Once the page has loaded, most tools keep working without an internet connection.