Convert TAR.LZO to TAR.GZ Online (The Full-Extension Path to Near-Universal Support)

Leaving a Narrow Speed Niche for a Format Nearly Everything Reads

TAR.LZO pairs a plain tar container with lzop's LZO compression, an algorithm whose own documentation states decompression speed as its overriding priority, ahead of how small the file ends up. TAR.GZ pairs the same kind of tar container with gzip's DEFLATE, formally specified in RFC 1951 and released as free, patent-unencumbered software by Jean-loup Gailly and Mark Adler in 1992 — a more general-purpose compressor that trades some of LZO's decompression speed for a meaningfully tighter compression ratio and, more importantly for this specific conversion, near-universal software support.

Converting between the two means fully decompressing lzop's LZO-compressed blocks back into the plain tar bytes, then recompressing that same tar content with DEFLATE instead. Writing the destination filename out as the full ".tar.gz" rather than the shortened ".tgz" makes no technical difference to either GNU tar's suffix detection or any mainstream archive tool's recognition of the format, but it does make the two-step construction — tar bundling, then gzip compression — explicit to anyone reading the filename cold, which matters specifically when a file is moving from a narrow, specialist context into a much broader, more general audience.

This particular direction — LZO to gzip rather than the reverse — is also the one that shows up far more often in practice, precisely because the source format is the specialist one. A TAR.LZO file built inside an embedded Linux build system or an OpenWrt firmware pipeline rarely needs to travel outside that environment, but the moment it does, whoever receives it is statistically far more likely to already have gzip available than to have lzop installed for a format they may never have encountered before.

No Entropy Coding at All Against a Two-Stage Compression Pipeline

LZO's default lzo1x_1 method finds repeated byte sequences and replaces them with back-references, but deliberately omits the entropy-coding stage that DEFLATE applies afterward — Huffman coding, which assigns shorter binary codes to whichever byte values occur most frequently once LZ77-style matching has already run. That extra stage is a direct, documented reason DEFLATE generally compresses tighter than LZO on typical data, even though DEFLATE's own 32 KB sliding window is itself fairly modest by modern standards.

The trade runs the other way on speed: LZO's own documentation and independent benchmarks consistently show it decompressing faster than gzip, since skipping entropy coding means less decoding work overall. Gzip still decompresses quickly by general standards — it remains markedly faster than bzip2 or xz — just not as fast as LZO specifically, which is the entire reason LZO gets chosen over gzip in the first place for genuinely time-critical, often embedded, use cases.

Both formats build integrity checking into their structure, though at different scales: lzop checksums each compressed block separately, using Adler-32 by default or CRC-32 if requested, while gzip stores one CRC-32 checksum covering the entire decompressed stream at the very end of the file. Neither checksum can repair detected corruption on its own; both formats only flag that something is wrong, a limitation that applies equally regardless of which granularity the checksum operates at.

What Rebuilding a Speed-Optimized Archive as TAR.GZ Gains and Costs

• Gain — near-universal software support: gzip is installed by default on essentially every Linux, macOS, and Unix system, and read by every mainstream Windows archive tool, unlike LZO's much narrower tooling.
• Gain — a smaller file on most typical data: DEFLATE's Huffman coding stage generally compresses tighter than LZO's simpler matching scheme.
• Lose — LZO's fastest-in-class decompression: gzip decompresses quickly by general standards, but not as fast as LZO specifically, a real cost if the archive feeds a genuinely time-critical process.
• Gain — a filename that documents its own construction: writing out ".tar.gz" in full, rather than a shortened form, tells any reader unfamiliar with LZO exactly what two steps built the file.
• Lose — LZO's very low CPU and memory overhead: DEFLATE needs somewhat more processing time and memory than LZO's lighter scan, a real difference on the most constrained embedded hardware.
• Unchanged — the actual file contents: both LZO and gzip are lossless, so extracted files remain identical regardless of which algorithm compressed them.

Where Each Format Sits on the Default-Software Spectrum

Reading a TAR.LZO file requires the lzop utility specifically, or GNU tar used with its --lzop flag, since mainstream Windows and macOS archive managers generally don't include LZO decompression by default — a real, current limitation keeping TAR.LZO mostly confined to Linux, Unix, and embedded-systems environments that already have lzop installed for a specific purpose.

Gzip sits at the opposite end of that spectrum. GNU tar supports it directly through its -z or --gzip flag, or automatically through the -a / --auto-compress option, which recognizes both the full ".tar.gz" spelling and the shortened ".tgz" as equally valid triggers for the same compression method. It's part of the default installation on virtually every Linux and macOS system, and 7-Zip, WinRAR, and PeaZip all read and write TAR.GZ on Windows without any extra setup — precisely the gap that makes this specific conversion worth requesting in the first place.

LZO's actual footprint is concentrated in a much narrower set of specific technical contexts than gzip's broad general-purpose reach: the Linux kernel's zram subsystem lists it as a selectable compression backend for its compressed RAM block device, SquashFS gained LZO support in kernel version 2.6.34, and Btrfs documents it as one of its three supported filesystem compression algorithms. Gzip isn't used the same way inside any of those kernel subsystems, since its extra entropy-coding stage would add latency to operations the kernel needs to complete as fast as possible.

Support Tickets Filed Over This Exact LZO-to-Gzip Switch

A recurring complaint in cross-platform development threads involves a TAR.LZO file produced on a Linux build server that a Windows-based colleague can't open at all, since neither 7-Zip nor WinRAR includes native LZO decompression — the documented fix is either installing a Windows-compatible lzop build or having the Linux side rebuild the archive as TAR.GZ before sharing it more broadly with the rest of the team.

A second, opposite report shows up specifically in embedded-firmware discussions: an image rebuilt as TAR.GZ for easier distribution or archival can turn out to be unusable for actual deployment if the target device's bootloader was written to decompress LZO-compressed data specifically and has no gzip decoder built into its limited firmware. In these cases, the version shared for review and the version actually flashed onto the hardware legitimately need to stay in two different formats.

A third pattern involves noticeable, though usually modest, size differences that surprise some users — because LZO's compression ratio isn't dramatically far behind gzip's on many kinds of data, someone expecting a large reduction after this specific conversion sometimes sees only a small improvement, compared with the bigger gains typically reported when converting the same archive to bzip2 or xz instead.

Where TAR.LZO and This Full-Extension TAR.GZ Actually Diverge

Questions About Rebuilding an LZO Archive as a Full-Extension TAR.GZ

Does writing ".tar.gz" instead of ".tgz" change anything about the file itself?
No. Both spellings produce identical bytes and are recognized equally by GNU tar's suffix detection and every mainstream archive tool; the full spelling is purely a readability choice.

How much smaller will my archive get after converting from TAR.LZO to TAR.GZ?
Usually somewhat smaller, though the gap between LZO and gzip's DEFLATE is more modest than switching to bzip2 or xz, which tend to compress meaningfully tighter than gzip does.

Why can't I open a TAR.LZO file with a standard Windows archive tool?
Mainstream tools like 7-Zip and WinRAR generally don't include native LZO decompression support. The lzop utility, or GNU tar's --lzop flag, is needed to read the original archive first.

Is gzip's decompression as fast as LZO's?
Not quite. Gzip decompresses quickly by general standards, but LZO is specifically optimized to be faster still, which is the entire reason LZO gets chosen over gzip in time-critical, especially embedded, contexts.

Does this conversion change any of the actual files?
No. Both LZO and gzip's DEFLATE are lossless compression methods, so every file extracted afterward is byte-for-byte identical to what was originally inside the TAR.LZO archive.

Why does writing ".tar.gz" in full matter more here than for other conversions?
Because the source format, TAR.LZO, is already unfamiliar to many people outside Linux and embedded contexts, spelling out the destination format's two-step construction explicitly reduces one more point of confusion for whoever receives the converted file.