Discover RiazHub’s free, 100% client-side Browser PDF Highlight & Annotation Studio. Easily highlight digital PDF text, draw freehand vector markups, place sticky note comments, whiteout sensitive text, and export study notes or vector PDFs directly in your browser without uploading files to any server.
Browser PDF Highlight & Annotation Studio
100% Client-Side Private Document Highlighting, Freehand Markup, Whiteout Redaction & Text Notes Extraction
Drag & Drop Your PDF Document Here
Or click below to browse files from your computer
PDF Highlighting & Visual Annotation Guide
How does the client-side text highlighting blend mode work?
Our tool renders semi-transparent vector color fills (using CSS and Canvas multiply blend mode) directly over digital text layers. This ensures high visual contrast so your original text stays 100% crisp, sharp, and perfectly readable underneath highlighter strokes without blacking out words.
Difference between Annotation Eraser and Whiteout Text Redaction
The Eraser tool removes highlights, pen strokes, or sticky notes you added to the canvas. The Whiteout Text tool draws a solid opaque box over original PDF text or graphics to permanently mask/redact sensitive content when downloading the rebuilt document.
Is my PDF file or uploaded content saved on any server?
Absolutely NOT. All PDF parsing, canvas rendering, text selection coordinate calculation, and document rebuilding take place 100% locally inside your browser using HTML5 Canvas APIs and Web Workers. No files are transmitted to RiazHub.com or any external server, ensuring complete confidentiality for private notes and contracts.