GZIP Compressor

Compress a single file as gzip without uploading it.

Choose file

—Input size

—Output size

—Size change

—Browser support

Choose a fileUses the browser's native Compression Streams API; no file is uploaded.

Browser-local GZIP size, ratio & byte preview

Compress text with the browser's native GZIP stream, compare source and compressed byte counts, inspect the GZIP header bytes and download the exact compressed payload without uploading the text.

Text to compressText encodingPreview bytes

—Source bytes

—GZIP bytes

—Size reduction

Ready.

File handling notes

connects ZIP creation/extraction, archive inspection, GZIP, TAR/TAR.GZ extraction, ZIP merging, multi-ZIP extraction, splitting/joining, duplicate detection, renaming, folder summaries, file inventories, and file-type inspection without requiring a file upload where the browser APIs support the task.

Archive and safety boundaries

Browser memory can limit very large files. TAR extraction supports ordinary TAR/USTAR regular files and directories rather than every PAX/sparse/link edge case. Password-protected or uncommon ZIP compression methods can exceed JSZip support. Normalized download paths do not grant arbitrary filesystem write access.