The .7z filename extension is associated with the 7z compressed file archive format and the open source 7-zip compression utility both developed by Igor Pavlov. The format had its initial release in 1999. It consists of a start header 32 bytes in size which contains the signature and link to the ending header, followed by the compressed data, a metadata block, and finally the end header. 7z supports limited recovery options for 7z archive files which can open but for one reason or another cannot extract due to CRC or other data related errors.
The .gz filename extension refers to the GZIP file format and compression/decompression utility of the same name which was initially released in 1992. It is the extension given to files compressed using the gzip utility. Unlike other compression tools of the time, gzip was originally intended to be used as a tool to compress a single file as opposed to multiple files or entire directories compressed as a single archive. As a work around, multiple files can be archived using the TAR archive file format, then that single TAR archive would then be compressed using the GZIP format. This would give the file a filename extension of .tar.gz.
FreeFileConvert uses tuned encoding for 7Z to TGZ conversions, preserving clarity while trimming file size. Finished audio streams instantly across phones, tablets, desktops, and modern browsers without extra tweaks.
Upload 7Z files from desktop, tablet, or cloud storage, queue multiple jobs, and let the converter finish autonomously. Return whenever convenient to download synchronized TGZ results on any device you rely on.
Process up to 5 files sized 1000 MB per batch without splitting queues manually. Mixed-format uploads convert together, producing consistent TGZ audio with dependable progress tracking.
The 7z compressed archive format was designed to be extensible, to allow it to easily adopt new compression algorithms as they are released. As of writing, the 7z format had support for seven compression algorithms namely LZMA, LZMA2, PPMD, BCJ, BCJ2, BZip2, and DEFLATE. The default algorithm used for compression is LZMA. It is also compatible with the stronger AES-256 encryption algorithm and is capable of compressing file structures of up to 16 Exabyte in size. Filenames can use any characters from the Unicode character set. 7z does not ignore errors found in headers of compressed archives, and as such will not open such archives.
The GZIP format uses the DEFLATE algorithm for compression. A file in this format consists of a 10 byte header containing the version number, timestamp, and magic number. Other blocks include optional extra header blocks, the DEFLATE payload, and a CRC-32 checksum contained in an 8 byte footer.
Upload your archive file in the 7Z format from your device, Dropbox, or Google Drive.
Select TGZ as the output format and click Convert. Adjust optional settings if needed.
Download the converted archive file. Each file stays available for up to 5 downloads.