---
name: "advdef"
section: "1"
platform: "linux"
package: "advancecomp"
version: "2.5-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/advdef"
---

# advdef(1)

AdvanceCOMP Deflate Compression Utility

## NAME

advdef - AdvanceCOMP Deflate Compression Utility

## SYNOPSIS

advdef \[-z, --recompress\] \[-0, --shrink-store\]

	\[-1, --shrink-fast\] \[-2, --shrink-normal\] \[-3, --shrink-extra\]

	\[-4, --shrink-insane\] \[-i, --iter N\]

	\[-f, --force\] \[-q, --quiet\]

	\[-h, --help\] \[-V, --version\] FILES...

## DESCRIPTION

The main purpose of this utility is to recompress the data present in the .png, .mng, .gz, .tgz and .svgz files.

The internal structure of the files isn´t changed. Only the compressed data is modified.

## OPTIONS

- **-z, --recompress FILES...**

  Recompress the specified files. If the -1, -2, -3, -4 options are specified it´s used the smallest file choice from the previous compressed data and the new compression. If the -0 option is specified the file is always rewritten without any compression.

- **-0, --shrink-store**

  Disable the compression. The file is only stored and not compressed. The file is always rewritten also if it´s bigger.

- **-1, --shrink-fast**

  Set the compression level to "fast" using the zlib compressor.

- **-2, --shrink-normal**

  Set the compression level to "normal" using the libdeflate compressor. This is the default level of compression.

- **-3, --shrink-extra**

  Set the compression level to "extra" using the 7z compressor. You can define the compressor iterations with the -i, --iter option.

- **-4, --shrink-insane**

  Set the compression level to "insane" using the zopfli compressor. You can define the compressor iterations with the -i, --iter option.

- **-i, --iter N**

  Define an additional numer of iterations for the 7z and zopfli compressors for modes -3 and -4. More iterations usually give a better compression, but may require a lot more time. Try for example with 10, 15, 20, and so on.

- **-f, --force**

  Force the use of the new file also if it´s bigger.

## LIMITATIONS

The advdef program cannot be used to recompress huge files because it needs to allocate memory for both the complete compressed and uncompressed data.

## COPYRIGHT

This file is Copyright (C) 2003, 2004 Andrea Mazzoleni

## SEE ALSO

[advpng(1)](/advpng/1.md), [advmng(1)](/advmng/1.md), [advzip(1)](/advzip/1.md), [gzip(1)](/gzip/1.md), [bzip2(1)](/bzip2/1.md)