<s>
QPDF	B-Language
is	O
both	O
a	O
software	B-Library
library	I-Library
and	O
a	O
free	B-License
command-line	B-Application
program	I-Application
that	O
can	O
convert	O
one	O
PDF	B-Application
file	I-Application
to	O
another	O
equivalent	O
PDF	B-Application
file	I-Application
.	O
</s>
<s>
It	O
is	O
capable	O
of	O
performing	O
transformations	O
such	O
as	O
linearization	O
(	O
also	O
known	O
as	O
web	O
optimization	O
or	O
fast	O
web	O
viewing	O
)	O
,	O
encryption	O
,	O
and	O
decryption	O
of	O
PDF	B-Application
files	I-Application
.	O
</s>
<s>
It	O
also	O
has	O
options	O
for	O
inspecting	O
or	O
checking	O
PDF	B-Application
files	I-Application
,	O
some	O
of	O
which	O
are	O
useful	O
primarily	O
to	O
PDF	B-Application
developers	O
.	O
</s>
<s>
QPDF	B-Language
includes	O
support	O
for	O
rotating	O
,	O
merging	O
and	O
splitting	O
PDFs	B-Application
through	O
the	O
ability	O
to	O
copy	O
objects	O
from	O
one	O
PDF	B-Application
file	I-Application
into	O
another	O
and	O
to	O
manipulate	O
the	O
list	O
of	O
pages	O
in	O
a	O
PDF	B-Application
file	I-Application
.	O
</s>
<s>
QPDF	B-Language
is	O
not	O
capable	O
of	O
converting	O
PDF	B-Application
into	O
other	O
formats	O
.	O
</s>
<s>
The	O
QPDF	B-Language
library	O
also	O
makes	O
it	O
possible	O
to	O
create	O
PDF	B-Application
files	I-Application
from	O
scratch	O
.	O
</s>
<s>
In	O
this	O
mode	O
,	O
the	O
user	O
is	O
responsible	O
for	O
supplying	O
all	O
the	O
contents	O
of	O
the	O
file	O
,	O
while	O
the	O
QPDF	B-Language
library	O
takes	O
care	O
of	O
the	O
syntactical	O
representation	O
of	O
the	O
objects	O
,	O
creation	O
of	O
cross	O
references	O
tables	O
and	O
,	O
optionally	O
,	O
object	O
streams	O
,	O
encryption	O
,	O
linearization	O
,	O
and	O
other	O
syntactic	O
details	O
.	O
</s>
<s>
QPDF	B-Language
is	O
written	O
in	O
C++	B-Language
.	O
</s>
