Gzip Compress & Decompress
Compress or decompress text and files
Free forever — no sign-up, nothing uploaded. Files never leave your device.
Gzip Compress & Decompress
Compress or decompress text and files
Drop your file here
or browse from your device
Browse filesdocument.pdf
1.2 MB
report.pdf
860 KB
100% private
Nothing is uploaded — everything runs in your browser.
Free forever
No account or payment required.
No sign-up
Open the tool and start using it right away.
Local processing
Processing time depends on your input and device.
About this tool
Compress text or files to gzip, deflate or deflate-raw right in your browser, or decompress them back. Zero uploads.
The BrainCoder Gzip Compress & Decompress tool lets you shrink text data using the gzip, deflate or deflate-raw algorithms directly in your browser. Gzip is one of the most widely used compression formats on the web — every HTTP server uses it to reduce payload sizes and speed up page loads. Now you can compress and decompress text, JSON, HTML, and other string data yourself without installing anything.
Compression can dramatically reduce the size of repetitive or verbose text. A 10 KB JSON payload might compress to under 2 KB, saving bandwidth and storage. Our tool uses the browser's built-in Compression Streams API, which means the compression happens at near-native speed with no server round-trips. Decompress gzip, deflate or deflate-raw data you encounter in your work — output is auto-detected across all three formats and fancy JSON results are pretty-printed.
This is particularly useful for developers debugging API responses, inspecting compressed assets, preparing payloads for bandwidth-constrained environments, or learning how compression works. Everything runs locally — your data is never uploaded anywhere.
Key features
Everything you get with Gzip Compress & Decompress — no premium upsell.
Gzip, deflate and deflate-raw compress and decompress in the browser
Uses the native Compression Streams API for speed
Works with text, JSON, HTML, CSS, and JavaScript
Shows compression ratio and original vs compressed size
Copy compressed output as Base64 or as a JSON payload with your own key
No server calls — fully offline capable
How to use Gzip Compress & Decompress
Follow the steps below to use the tool.
- 1
Paste or type text into the input area
Enter the text content you want to compress — this could be a JSON response, HTML snippet, or any other string data.
- 2
Choose a format and click Compress
Pick gzip, deflate or deflate-raw, then compress to a Base64 string or to a JSON payload. The ratio shows how much space was saved.
- 3
Copy or export the result
Copy the Base64 string, or download the compressed file. A JSON payload can also be downloaded as the raw compressed bytes if you need that exact file.
- 4
To decompress, paste compressed data and click Decompress
Paste Base64-encoded data, a JSON payload, or raw bytes and click Decompress. gzip, deflate and deflate-raw are tried automatically.
Still free, still private — your files never leave your device.
Launch Gzip Compress & DecompressFrequently asked questions
Quick answers before you launch the tool.
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