PDF (Portable Document Format)

PDF (Portable Document Format) is a fixed-layout document format created by Adobe and now standardized as ISO 32000. It describes text, vector graphics, and images so a page looks identical everywhere.

Why it matters

PDFs are the standard for forms, invoices, contracts, and manuals because layout stays stable and files can be signed, encrypted, or made searchable. They can also hold links and form fields. Accessibility depends on how they are made: tagged PDFs work with screen readers, while scanned images of text do not.

Files from word processors are usually smaller than scans.

Example

$ pdftotext invoice.pdf - | head -3
Invoice 2026-1042
Total due: 480.00

If this command prints nothing, the PDF is probably a scanned image and needs OCR to become searchable.

Common mistakes

• Publishing scanned PDFs with no text layer, making them unsearchable and inaccessible.
• Assuming a PDF cannot be edited or copied from; most can.
• Sending large unoptimized PDFs that slow page loads.

Related

• Screen Reader
• WCAG (Web Content Accessibility Guidelines)
• File Extension
• Lossy vs Lossless Compression

यह पेज सामान्य जानकारी है, जिसे हमारी संपादकीय टीम ने लिखा है और दस्तावेज़ीकरण बदलने पर अपडेट किया जाता है। सर्वर और प्रदाता अलग-अलग होते हैं, इसलिए बदलाव पहले सुरक्षित तरीके से जाँचें। देखें: संपादकीय नीति और अस्वीकरण.