Use the Gzip + Base64 decode tool in this section.

zlib instead of gzip?

This tool uses gzip headers. Raw zlib payloads need a different pipeline.

Huge pastes can be slow or hit memory limits; prefer smaller chunks for browser-based compression.

Gzip + Base64 encoder

Type or paste text. The tool gzip-compresses the UTF-8 bytes, then Base64-encodes the result.

Text

Base64 (gzip)

Input is encoded as UTF-8, compressed with the browser gzip stream, then the compressed bytes are Base64-encoded.

Output is not the same as plain Base64 of the text: decompression is required before reading the original.

Smaller strings over size-limited channels, quick experiments, or matching backends that expect gzip-then-Base64.

Compression runs in your browser. This is not encryption; gzip + Base64 is reversible by anyone with the string.

Same as plain Base64?: No. Plain Base64 only encodes UTF-8. Here the bytes are gzip-compressed first, so the output is shorter for repetitive text.
How do I reverse it?: Use the Gzip + Base64 decode tool in this section.
zlib instead of gzip?: This tool uses gzip headers. Raw zlib payloads need a different pipeline.
Very large input?: Huge pastes can be slow or hit memory limits; prefer smaller chunks for browser-based compression.