<s>
Poppler	B-Language
is	O
a	O
free	B-Application
software	I-Application
utility	B-Library
library	I-Library
for	O
rendering	O
Portable	B-Application
Document	I-Application
Format	I-Application
(	O
PDF	B-Application
)	O
documents	O
.	O
</s>
<s>
Its	O
development	O
is	O
supported	O
by	O
freedesktop.org	B-Application
.	O
</s>
<s>
It	O
is	O
commonly	O
used	O
on	O
Linux	B-Application
systems	O
,	O
and	O
is	O
used	O
by	O
the	O
PDF	B-Language
viewers	I-Language
of	O
the	O
open	B-Application
source	I-Application
GNOME	B-Application
and	O
KDE	B-Application
desktop	O
environments	O
.	O
</s>
<s>
The	O
project	O
was	O
started	O
by	O
Kristian	O
Høgsberg	O
with	O
two	O
goals	O
:	O
to	O
provide	O
PDF	B-Application
rendering	O
functionality	O
as	O
a	O
shared	O
library	B-Library
,	O
to	O
centralize	O
maintenance	O
effort	O
and	O
to	O
go	O
beyond	O
the	O
goals	O
of	O
Xpdf	B-Protocol
,	O
and	O
to	O
integrate	O
with	O
functionality	O
provided	O
by	O
modern	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
As	O
of	O
the	O
version	O
0.18	O
release	O
in	O
2011	O
,	O
the	O
poppler	B-Language
library	B-Library
represents	O
a	O
complete	O
implementation	O
of	O
ISO	B-Application
32000-1	I-Application
,	O
the	O
PDF	B-Application
format	I-Application
standard	O
,	O
and	O
is	O
the	O
first	O
major	O
free	O
PDF	B-Application
library	B-Library
to	O
support	O
its	O
forms	O
(	O
only	O
Acroforms	O
but	O
not	O
full	O
XFA	B-Language
forms	I-Language
)	O
and	O
annotations	O
features	O
.	O
</s>
<s>
Poppler	B-Language
is	O
a	O
fork	B-Application
of	O
Xpdf-3.0	O
,	O
a	O
PDF	B-Application
file	I-Application
viewer	O
developed	O
by	O
Derek	O
Noonburg	O
of	O
Glyph	O
and	O
Cog	O
,	O
LLC	O
.	O
</s>
<s>
The	O
name	O
Poppler	B-Language
comes	O
from	O
the	O
animated	O
series	O
Futurama	B-Application
episode	O
"	O
The	O
Problem	O
with	O
Popplers.	O
"	O
</s>
<s>
Notable	O
free	B-Application
software	I-Application
applications	O
using	O
Poppler	B-Language
to	O
render	O
PDF	B-Application
documents	I-Application
include	O
:	O
</s>
<s>
Application	O
GUI	O
widgets	O
Evince	B-Language
GTK	B-Application
Inkscape	B-Application
GTK	B-Application
LibreOffice	O
4.x	O
GTK	B-Application
Okular	B-Language
Qt	B-Language
pdftotext	B-Language
,	O
pdftohtml	O
,	O
etc	O
.	O
</s>
<s>
Poppler	B-Language
can	O
use	O
two	O
back-ends	B-Architecture
for	O
drawing	O
PDF	B-Application
documents	I-Application
,	O
Cairo	B-Language
and	O
Splash	O
.	O
</s>
<s>
Its	O
features	O
may	O
depend	O
on	O
which	O
back-end	B-Architecture
it	O
employs	O
.	O
</s>
<s>
A	O
third	O
back-end	B-Architecture
based	O
on	O
Qt4	B-Language
's	O
painting	O
framework	O
"	O
Arthur	O
"	O
,	O
is	O
available	O
,	O
but	O
is	O
incomplete	O
and	O
no	O
longer	O
under	O
active	O
development	O
.	O
</s>
<s>
Bindings	O
exist	O
for	O
Glib	O
and	O
Qt5	O
,	O
that	O
provide	O
interfaces	O
to	O
the	O
Poppler	B-Language
backends	B-Architecture
,	O
although	O
the	O
Qt5	O
bindings	O
support	O
only	O
the	O
Splash	O
and	O
Arthur	O
backends	B-Architecture
.	O
</s>
<s>
There	O
is	O
a	O
patchset	O
available	O
to	O
add	O
support	O
for	O
the	O
Cairo	B-Language
backend	B-Architecture
to	O
the	O
Qt5	O
bindings	O
,	O
but	O
the	O
Poppler	B-Language
project	O
does	O
not	O
currently	O
wish	O
to	O
integrate	O
the	O
feature	O
into	O
the	O
library	B-Library
proper	O
.	O
</s>
<s>
Some	O
characteristics	O
of	O
the	O
back-ends	B-Architecture
include	O
:	O
</s>
<s>
Cairo	B-Language
:	O
Anti-aliasing	B-Algorithm
of	O
vector	O
graphics	O
,	O
and	O
transparent	O
objects	O
.	O
</s>
<s>
Cairo	B-Language
does	O
not	O
smooth	O
bitmap	O
images	O
such	O
as	O
scanned	B-Application
documents	O
.	O
</s>
<s>
Cairo	B-Language
does	O
not	O
depend	O
on	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
,	O
so	O
Poppler	B-Language
can	O
run	O
on	O
other	O
platforms	B-Device
like	O
Wayland	O
,	O
Windows	B-Application
or	O
macOS	B-Application
.	O
</s>
<s>
Poppler	B-Language
comes	O
with	O
a	O
text-rendering	O
back-end	B-Architecture
as	O
well	O
,	O
which	O
can	O
be	O
invoked	O
from	O
the	O
command	B-Application
line	I-Application
utility	O
pdftotext	B-Language
.	O
</s>
<s>
It	O
is	O
useful	O
for	O
searching	O
for	O
strings	O
in	O
PDFs	B-Application
from	O
the	O
command	B-Application
line	I-Application
,	O
using	O
the	O
utility	O
grep	B-Application
,	O
for	O
instance	O
.	O
</s>
<s>
Poppler	B-Language
partially	O
supports	O
annotations	O
and	O
Acroforms	O
.	O
</s>
<s>
It	O
does	O
not	O
support	O
JavaScript	O
nor	O
the	O
rendering	O
of	O
full	O
XFA	B-Language
forms	I-Language
.	O
</s>
<s>
poppler-utils	O
is	O
a	O
collection	O
of	O
command-line	B-Application
utilities	O
built	O
on	O
Poppler	B-Language
's	O
library	B-Library
API	O
,	O
to	O
manage	O
PDF	B-Application
and	O
extract	O
contents	O
:	O
</s>
