Open .gz Files Online - Free Gunzip Tool (No Upload)
Extract .gz files and decode Base64 gzip strings online in your browser. Free gunzip tool with no upload, instant download, and private processing.
Open a .gz file online in File mode or decode a Base64 gzip string in String mode. Everything runs in your browser, so you can extract content instantly without uploading your data.
Input
Drag & drop a .gz file here, or click to select
Output
File processed successfully. Download should start automatically.
Open .gz Files & Gzip Strings
Open .gz files and decode Base64 encoded gzip strings in one tool.
No Upload Required
All decompression happens locally in your browser, so your data stays on your device.
Instant Browser Extraction
Extract compressed content in seconds without installing gunzip or any desktop app.
How to Open .gz Files and Decode Gzip Strings Online
Open .gz files, extract compressed content, and decode Base64 gzip strings online without terminal commands, software installs, or file uploads.
Open a .gz file or decode a Base64 gzip string and this tool instantly extracts the original content in your browser. Drop a gzip file in File mode or paste an encoded string in String mode, then click Decompress to reveal and download the uncompressed data. Nothing is uploaded—all extraction runs locally, so no terminal, gunzip install, or server upload is required.
How to Use the Gunzip Decompress Tool
- 1
Choose File or String mode
Select File mode to open a .gz file, or String mode to decode a Base64-encoded gzip string.
- 2
Provide your input
Drag and drop a .gz file (or click to browse), or paste your Base64 gzip string into the input field.
- 3
Click Decompress
The tool decodes Base64 if needed, then expands the gzip data and shows the original content in the output panel.
- 4
Copy or download the result
Copy the decompressed text to your clipboard, or download the extracted file to save the uncompressed version.
References
- RFC 1952 — GZIP File Format Specification
The authoritative IETF specification defining the gzip file format, headers, and member structure.
- RFC 1951 — DEFLATE Compressed Data Format
The IETF spec for the DEFLATE algorithm that gzip uses to compress data.
- MDN — DecompressionStream
Web API for decompressing gzip and deflate streams directly in the browser.
Related Tools
Gzip Compress
Compress text or files into gzip format and produce a .gz output.
Base64 Encode / Decode
Encode or decode Base64 strings, useful for handling gzip payloads.
JSON Formatter
Beautify and validate JSON extracted from compressed files.
CSV to JSON
Convert decompressed CSV data into structured JSON.
Frequently Asked Questions
- How do I open a .gz file online?
- Choose File mode, upload your .gz file, and click Decompress. The file is extracted directly in your browser, and the uncompressed version downloads automatically without requiring terminal commands or software installation.
- Is my data safe?
- Yes, absolutely. This tool runs entirely in your web browser using JavaScript. Your files and data are never uploaded to our servers, ensuring complete privacy and security.
- Can I decode a Base64 gzip string?
- Yes. Switch to String mode, paste the Base64 gzip string, and click Decompress. The tool decodes the Base64 input first and then expands the Gzip data to reveal the original text in the output panel.
- Do I need to install gunzip or any software?
- No. This is a fully online gunzip tool—no gunzip binary, command line, or desktop app is needed. Decompression happens instantly in your browser.
- What file types can I extract from a .gz archive?
- A .gz file holds a single compressed file of any type—text, JSON, CSV, logs, or binary. After decompression you get the original file back, ready to copy or download.