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Use CompressionConvertOptions to change the archive format while retaining its contained files. For example, convert a ZIP archive into an ISO image, or re-encode single-file compressed data from GZIP into UUE.
To convert the documents inside an archive to PDF instead, see Convert compression files.
Set CompressionConvertOptions.setFormat to the desired output format and pass the options to Converter.convert.
import com.groupdocs.conversion.Converter;
import com.groupdocs.conversion.filetypes.CompressionFileType;
import com.groupdocs.conversion.options.convert.CompressionConvertOptions;
public class ConvertZipToIso {
public static void main(String[] args) {
CompressionConvertOptions options = new CompressionConvertOptions();
options.setFormat(CompressionFileType.Iso);
try (Converter converter = new Converter("sample.zip")) {
converter.convert("converted.iso", options);
}
}
}
For the reverse conversion, load sample.iso, use CompressionFileType.Zip, and save to converted.zip. Java 26.10 also provides conversion between ISO and TAR, CPIO, or 7Z archives.
UUE encodes a single file. This example changes a GZIP-compressed payload into UUE without converting the payload document itself.
import com.groupdocs.conversion.Converter;
import com.groupdocs.conversion.filetypes.CompressionFileType;
import com.groupdocs.conversion.options.convert.CompressionConvertOptions;
import com.groupdocs.conversion.options.load.CompressionLoadOptions;
public class ConvertGzipToUue {
public static void main(String[] args) {
CompressionLoadOptions loadOptions = new CompressionLoadOptions();
loadOptions.setFormat(CompressionFileType.Gzip);
CompressionConvertOptions options = new CompressionConvertOptions();
options.setFormat(CompressionFileType.Uue);
try (Converter converter = new Converter("sample.gz", () -> loadOptions)) {
converter.convert("converted.uue", options);
}
}
}
Specify UUE as the source and GZIP as the target:
import com.groupdocs.conversion.Converter;
import com.groupdocs.conversion.filetypes.CompressionFileType;
import com.groupdocs.conversion.options.convert.CompressionConvertOptions;
import com.groupdocs.conversion.options.load.CompressionLoadOptions;
public class ConvertUueToGzip {
public static void main(String[] args) {
CompressionLoadOptions loadOptions = new CompressionLoadOptions();
loadOptions.setFormat(CompressionFileType.Uue);
CompressionConvertOptions options = new CompressionConvertOptions();
options.setFormat(CompressionFileType.Gzip);
try (Converter converter = new Converter("sample.uue", () -> loadOptions)) {
converter.convert("converted.gz", options);
}
}
}
Not every source archive can be converted to every target format. Check the source’s available targets with Getting Possible Conversions before choosing CompressionFileType.
Use a complete-document output path or stream for archive conversion. Page-by-page output is not supported for the ISO and UUE conversions shown here. Converting an ordinary PDF or Word document directly to an archive is also a different operation; these examples require an archive or single-file compression format as input.
For explicit source formats and source archive passwords, see Load compression document with options.
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