PDF Layers
PDF Optional Content Groups
Named visibility layers in a PDF that allow content to be shown or hidden, used in CAD drawings and multilingual documents.
Teknik Detay
In the PDF specification (ISO 32000-2:2020), pdf layers is implemented as a specialized object within the document's object graph. PDF files use a cross-reference table to index every object by byte offset, enabling random access without sequential parsing. This architecture allows pdf layers to be read, modified, or extracted independently of other document elements. The binary structure supports incremental saves, where changes append to the file without rewriting existing content.
Ornek
```javascript
// PDF Layers: PDF manipulation example
import { PDFDocument } from 'pdf-lib';
const pdfDoc = await PDFDocument.load(fileBytes);
const pages = pdfDoc.getPages();
console.log(`Pages: ${pages.length}`);
```
Ilgili Formatlar
Ilgili Araclar
M
Merge PDF
S
Split PDF
C
Compress PDF
R
Rotate PDF
A
Add Page Numbers
P
PDF to JPG
W
Watermark PDF
R
Reorder PDF Pages
F
Flatten PDF
E
Edit PDF Metadata
S
Sign PDF
J
JPG to PDF
E
Extract Text from PDF
D
Delete PDF Pages
R
Reverse PDF
E
Extract PDF Pages
E
Extract Odd/Even Pages
R
Resize PDF Pages
C
Crop PDF
I
Insert Blank Pages
D
Duplicate PDF Pages
P
PDF to PNG
A
Add Header & Footer
A
Add Text to PDF
A
Add Image to PDF