Features of PDF X: PDF Editor & PDF Reader

High-Performance PDF Reading

PDF X pre-processes adjacent pages in the background so scrolling through dense documents feels smooth rather than stuttering through per-page render delays. Night mode, persistent zoom levels, and a bookmark system make extended reading sessions comfortable, while facing page and continuous scroll views accommodate different reading preferences. A thumbnail sidebar gives a visual overview of the entire document, making navigation through long reports significantly faster than scrolling page by page.

Annotation & Markup Tools

Highlights, sticky notes, freehand drawing, geometric shapes, text boxes, and rubber stamps are all available with configurable color and opacity, covering the annotation needs of both casual readers and detailed reviewers. The annotation layer is stored separately from document content, so the original PDF is never destructively modified and can be restored to its pristine state at any time. A unified sidebar lists all annotations in document order, making review of your own notes as efficient as reading the document itself.

Editing & Form Interaction

Practical text edits — correcting a typo, updating a date — work on standard text elements while maintaining the original font if it is embedded in the document. Interactive form fields including text inputs, checkboxes, radio buttons, and signature fields are fully fillable, with completed data saved back into the PDF. Digital signature support allows signing documents in compliance with common e-signature standards, removing the need to print, sign physically, and scan back.