PDFDancer is a developer-first PDF editing API that enables precise, programmatic modification of existing PDFs while preserving their original layout, typography, and visual integrity. Unlike traditional PDF libraries that focus on generation or overlays, pdfdancer edits content in place, treating text as a first-class, editable object rather than static shapes. The API is purpose-built for workflows that require scale, automation, and design fidelity - such as personalization, localization, compliance editing, and redaction - without forcing teams to rebuild templates or compromise on design. ⸻ Core Capabilities Edit Existing PDFs, Not Just Generate New Ones • Modify text directly within arbitrary, pre-designed PDFs • No reflow surprises, no font drift, no layout breakage • Pixel-perfect preservation of spacing, alignment, and branding Deep Text Intelligence • Reconstructs logical text structures (glyphs → fragments → lines → paragraphs → editable blocks) from raw PDF co