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Gifsicle manipulates GIF image files. Depending on command lineoptions, it can merge several GIFs into a GIF animation; explode ananimation into its component frames; change individual frames in ananimation; turn interlacing on and off; add transparency; add delays,disposals, and looping to animations; add and remove comments; flipand rotate; optimize animations for space; change images' colormaps;and other things.

Gifview, a companion program, displays GIF images and animations on anX display. It can display multi-frame GIFs either as slideshows,displaying one frame at a time, or as real-time animations.

Gifdiff, another companion program, checks two GIF files for identicalvisual appearance. This is probably most useful for testingGIF-manipulating software.

Each of these programs has a manpage,PROGRAMNAME.1.

The Gifsicle package comes with NO WARRANTY, express or implied,including, but not limited to, the implied warranties ofmerchantability and fitness for a particular purpose.

SeeNEWS.md in this directory for changes in recent versions. The Gifsiclehome page is:

http://www.lcdf.org/gifsicle/

Type./configure, thenmake.

If./configure does not exist (you downloaded from Github), runautoreconf -i first.

./configure accepts the usual options; seeINSTALL for details.To build without gifview (for example, if you don't have X11), use./configure --disable-gifview. To build without gifdiff,use./configure --disable-gifdiff.

make install will build and install Gifsicle and its manual page(under /usr/local by default).

To build Gifsicle on Windows using Visual C, change into thesrcdirectory and run

nmake -f Makefile.w32

Gifview will not be built. The makefile is from Emil Mikulicdarkmoon@connexus.net.au with updates by Steven Marthousecomments@vrml3d.com.

To build Gifsicle on Windows using Borland C++, change into thesrcdirectory and run

nmake -f Makefile.bcc

Stephen Schnipselschnipsel@m4f.net providedMakefile.bcc. Youwill need to edit one of these Makefiles to use a different compiler.You can edit it with any text editor (like Notepad). See the file formore information.

If you have trouble building or running Gifsicle, try GitHub issues:https://github.com/kohler/gifsicle

Eddie Kohler,ekohler@gmail.com
http://www.read.seas.harvard.edu/~kohler/
Please note that I do not provide support for Windows.

All source code is Copyright (C) 1997-2025 Eddie Kohler.

IF YOU PLAN TO USE GIFSICLE ONLY TO CREATE OR MODIFY GIF IMAGES, DON'TWORRY ABOUT THE REST OF THIS SECTION. Anyone can use Gifsicle howeverthey wish; the license applies only to those who plan to copy,distribute, or alter its code. If you use Gifsicle for anorganizational or commercial Web site, I would appreciate a link tothe Gifsicle home page on any 'About This Server' page, but it's notrequired.

This code is distributed under the GNU General Public License, Version2 (and only Version 2). The GNU General Public License is availablevia the Web athttp://www.gnu.org/licenses/gpl.html or in the'COPYING' file in this directory.

The following alternative license may be used at your discretion.

Permission is granted to copy, distribute, or alter Gifsicle, whole orin part, as long as source code copyright notices are kept intact,with the following restriction: Developers or distributors who plan touse Gifsicle code, whole or in part, in a product whose source codewill not be made available to the end user -- more precisely, in acontext which would violate the GPL -- MUST contact the author andobtain permission before doing so.

This program is dedicated to the memory of Anne Dudfield, who namedit. Anne was an incredible friend and ridiculous person. ANNIED!!!!!!

Eddie Kohlerekohler@gmail.com
http://www.read.seas.harvard.edu/~kohler/
He wrote it.

David Hedbordavid@hedbor.org
Many bug reports and constructive whining about the optimizer.

Emil Mikulicdarkmoon@connexus.net.au
Win32 port help.

Hans Dinsen-Hansendino@danbbs.dk
http://www.danbbs.dk/~dino/
Adaptive tree method for GIF writing.

Kornel Lesiński
--lossy option.