utilby

PDF Editor

Edit PDF documents online for free. Add text, draw, sign, highlight, whiteout sensitive data, and insert images with zero server uploads.

Runs in your browser · Files never uploaded

Choose or Drop a PDF File to Edit

Edit existing text, move images & elements with seamless background matching, add signatures, freehand draw, and highlight directly in your browser.

100% Client-Side Privacy: Your document is processed locally in your browser and never uploaded.

How to use PDF Editor

  1. 1

    Upload Your PDF Document

    Drag and drop any PDF file into the editor, or click 'Select PDF File' to browse from your device. Files up to 100 MB are supported.

  2. 2

    Select an Editing Tool

    Choose from the top toolbar: Add Text, Freehand Pen, Highlighter, Whiteout Redaction, Shapes (Rectangle, Circle), or Signatures.

  3. 3

    Annotate, Sign or Redact

    Click and place text boxes, draw signatures with mouse or stylus, black out or white out sensitive information, and customize fonts and colors.

  4. 4

    Download Edited PDF

    Click 'Download PDF' to bake all annotations, text, and signatures into a clean, professional vector PDF file instantly.

100% Client-Side Vector PDF Burning Engine

Most online PDF editors require you to upload your sensitive contracts, tax forms, and IDs to remote cloud servers. Utilby operates on a zero-upload architecture: the entire editing, rendering, and vector modification pipeline runs directly in your browser using WebAssembly and Web Standards.

Vector Font and Element Embedding: When you add text or drawings, our engine denormalizes coordinate systems from DOM space to PDF vector coordinate space and embeds standard PostScript fonts (Helvetica, Times, Courier) or rasterized vector streams via pdf-lib.

Real Whiteout & Redaction: Our whiteout tool writes pure opaque vector color rectangles over the document layer, ensuring clean redaction without degrading the underlying vector text of the rest of your document.

Cross-Device Responsive Normalization: All annotations are stored as resolution-independent normalized percentages (0.0 to 1.0). Whether you view the PDF at 100% zoom, 250% zoom, on a high-DPI Retina display, or on a smartphone, annotations stay perfectly aligned to the exact PDF coordinates.

Questions & answers

Never. All PDF rendering, text editing, signature stamping, and document generation occur 100% locally on your computer or phone using your browser's internal engine. Your sensitive files never leave your machine.