How big is the size win over the plain tarball?

Dramatic for typical tarball content — LZMA2 routinely takes source trees, logs, and datasets down to 15-30% of their raw size, beating ZIP's Deflate by a further 20-40% on the same input. The exception is media-heavy tarballs, since JPEGs and MP4s are already compressed.

Is the output a .tar.7z or a plain .7z?

A plain .7z — the tarball is unpacked and its files are repacked directly, so you can browse and extract individual files without decompressing everything. The trade-off is that Unix ownership metadata the TAR carried is not preserved inside the 7z.

How strong is 7z's encryption if I protect the archive later?

AES-256, with the option to encrypt filenames as well — so even the list of contents stays hidden, something classic ZIP encryption never offered. TAR by contrast has no protection at all, making 7z a sensible destination for archives that need both compression and confidentiality.

TAR to 7Z Converter – Free & Online

Convert TAR to 7Z

Turn TAR files into 7Z in seconds — free, secure, and no signup required.

Free tier: 5 conversions/day, files up to 50 MB, ad-supported. Need more? See Pro plans →

256-bit SSL encryptionYour files are protected end-to-end

Lightning-fast conversionsProcess files in seconds, not minutes

All major archive formatsZIP, RAR, 7Z, TAR & more

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Converting TAR to 7Z compresses a plain Unix tarball with the high-ratio LZMA2 algorithm, giving you a much smaller file that's easy to share and store — with optional AES-256 encryption.

Convert TAR to 7Z – Free Online TAR to 7Z Converter

Why convert TAR to 7Z?

Shrink an uncompressed TAR dramatically with 7z compression.
Get a single portable file with strong optional encryption.
Open, free format with no licensing restrictions.

How to convert TAR to 7Z

Upload your TAR file using the area above.
7Z is preselected as the target format.
Click Start and wait for the conversion to finish.
Download your converted 7Z file.

Convert TAR to 7Z

Convert TAR to 7Z – Free Online TAR to 7Z Converter

Why convert TAR to 7Z?

How to convert TAR to 7Z

TAR to 7Z — Frequently Asked Questions