How it works
How to use the Zlib Decompress
Paste or open your input
Type, paste or drop a file into the left editor — or press Sample to try it.
Adjust the options
Use the options in the toolbar; the result updates as you type.
Copy or download the result
Copy or download the output — or press Swap to convert in the other direction.
About the Zlib Decompress
Inflate zlib-wrapped deflate data (as produced by zlib.compress, PHP gzcompress or Java Deflater) from Base64 or hex. Press Swap to compress.
Built for developers
Why developers use it
Private by design
Runs 100% in your browser. Nothing you paste is uploaded, logged or stored on a server.
Instant results
Output updates as you type, with precise error locations when something is wrong.
Works offline
Once loaded, the tool keeps working without a connection. Install it as an app if you like.
Free, no sign-up
No accounts, no limits, no watermarks.
FAQ
Frequently asked questions
Is my data uploaded anywhere?
No. Everything runs locally in your browser — nothing you type, paste or open is sent to a server, logged or stored. The tool keeps working offline once the page has loaded.
Keep going
Related tools
- Gzip DecompressDecompress gzip data from Base64 or hex
- Base64 Encode / DecodeEncode and decode Base64 text and files
- URL Encode / DecodePercent-encode and decode URLs and query strings
- HTML EscapeEscape text for HTML
- JSON Escape / UnescapeEscape text as a JSON string or unescape it
- Base32 EncodeEncode text to Base32 (RFC 4648)
- JSON FormatterFormat, validate and explore JSON
- JSON to CSVConvert JSON arrays to CSV and CSV back to JSON