Compress a file as Brotli or create a tar.br archive from multiple files and folders directly in your browser. Read more

What is Brotli create?

Brotli is a lossless byte-stream format specified in RFC 7932, not a native multi-file archive. This tool creates .br when one file is selected. For multiple files or folders it first creates a TAR archive that preserves entry names and paths, then Brotli-compresses it as .tar.br.

How to use this tool

Add files or folders, review the listed paths, select compression level 1–11, and choose an appropriate .br or .tar.br filename. Create and download the result when processing finishes. Use Brotli Extract to inspect or restore it.

Output modes

Download (default) keeps the generated result in browser memory and provides a reusable Download button. You can rename the download without recompressing while the content is unchanged.
Save directly to a file writes the archive incrementally to a local file you choose. It uses less peak memory for large outputs, but there is no repeat Download button without creating again. Availability depends on browser support for the File System Access API in a secure context.

Files are still processed locally and are not uploaded.

Choosing the right format

A raw .br stream stores compressed bytes but no original filename. TAR supplies the archive structure for .tar.br; Brotli supplies compression. Higher levels can improve size at the cost of time and memory, especially on larger text-like input.

Important limitations

Neither Brotli nor TAR encrypts filenames or contents. Download mode retains the generated output in memory. Direct Save avoids retaining the complete output, though codec state and bounded chunks still use memory. Use native streaming tools for large collections. Review entry names and avoid ambiguous or unsafe paths before distributing an archive.

Frequently asked questions

Why can another program not open the result?

Check whether the result is a single raw .br stream or a TAR archive wrapped in Brotli. Many tools can decode .br but need a separate TAR step for .tar.br; the filename extension should reflect the actual structure.