Open the files. Understand the cause.
Explore font replacement, form loss, scans and OCR, photo orientation, overlap, hiding versus deletion, and image quality through original files. Successful outputs and educational failures are clearly distinguished.
Why visible Korean text is not always editable
A font that displays existing text may not encode new characters. Compare actual replacements in our embedded TrueType subset and Type0 examples. →
A visible field is not proof that a form survived merging
We copied the pages of an original two-page form. Its field tree and bookmarks disappear even though the page still looks similar. PDF Desk refuses this document rather than exporting that failure. →
One page, three different kinds of text
We authored a page as real text, a raster scan and a raster with synthetic hidden OCR. Similar appearance does not imply the same search or editing behavior. →
Why a phone photo can turn sideways in a PDF
We imported an original chart with EXIF orientations 1–8 through the actual workbench. Orientation 6 changes both rotation and pixel dimensions. →
An inserted image hides the original wording
Content remaining in a file is different from content remaining readable. Compare the same opaque image placed over the date and in unused space. →
Covering and cropping do not delete sensitive data
Our fictional reference SAMPLE-4821 remains readable by an independent parser after covering or cropping. This educational failure uses no personal information. →
Check image clarity and preservation after saving
We placed 1200×800 and 240×160 images at the same printed size. Preserving source bytes cannot restore pixels that were already discarded. →