Provided by: zipalign_6.0.1+r16-2_amd64 
NAME
zipalign - a ZIP/APK alignment tool for Android application files
SYNOPSIS
To align infile.apk and save it as outfile.apk:
zipalign [ -f ] [ -v ] <alignment> infile.apk outfile.apk
To confirm the alignment of existing.apk:
zipalign -c -v <alignment> existing.apk
The <alignment> is an integer that defines the byte-alignment boundaries. This must always be 4 (which provides
32-bit alignment) or else it effectively does nothing.
DESCRIPTION
zipalign is an archive alignment tool that provides important optimization to Android application (.apk) files.
The purpose is to ensure that all uncompressed data starts with a particular alignment relative to the start of
the file. Specifically, it causes all uncompressed data within the .apk, such as images or raw files, to be
aligned on 4-byte boundaries. This allows all portions to be accessed directly with mmap() even if they contain
binary data with alignment restrictions. The benefit is a reduction in the amount of RAM consumed when running
the application.
This tool should always be used to align your .apk file before distributing it to end-users. The Android build
tools can handle this for you. When using Eclipse with the ADT plugin, the Export Wizard will automatically
zipalign your .apk after it signs it with your private key. The build scripts used when compiling your
application with Ant will also zipalign your .apk, as long as you have provided the path to your keystore and the
key alias in your project ant.properties file, so that the build tools can sign the package first.
CAUTION: zipalign must only be performed after the .apk file has been signed with your private key. If you
perform zipalign before signing, then the signing procedure will undo the alignment. Also, do not make
alterations to the aligned package. Alterations to the archive, such as renaming or deleting entries, will
potentially disrupt the alignment of the modified entry and all later entries. And any files added to an
"aligned" archive will not be aligned.
The adjustment is made by altering the size of the "extra" field in the zip Local File Header sections. Existing
data in the "extra" fields may be altered by this process.
For more information about how to use zipalign when building your application, please read Signing Your
Application:
https://developer.android.com/tools/publishing/app-signing.html
OPTIONS
A summary of options is included below.
-f overwrite existing outfile.zip
-v verbose output
-c confirm the alignment of the given file
AUTHOR
zipalign was written by the Android Open Source Project.
July 2014 ZIPALIGN(1)