Select

Click any annotation to select it. Drag to move, drag the corner handles to resize. Press the Delete button in the toolbar to remove it.

Text

Click anywhere on the page to place a text box. It starts in editing mode — type immediately. Use the Size slider to adjust the font. Use the colour picker to change the text colour. After finishing, switch to Select to move or resize the text box.

Draw

Freehand drawing — hold and drag to draw. Useful for circling areas, underlining, or adding arrows. Control the stroke colour with the colour picker and thickness with the Width slider.

Rectangle

Drag to draw a rectangle outline. Works well for highlighting sections, drawing boxes around tables, or marking up diagrams. The rectangle is semi-transparent so the content underneath stays visible.

Whiteout

Drag to draw a solid white rectangle. Use this to cover content you don't want visible — phone numbers, addresses, sensitive figures, watermarks. After downloading, the covered area is permanently hidden.

Can I edit existing text in the PDF?

No — you can only add new text on top. Editing existing PDF text requires re-parsing the font data and layout, which is not possible in a purely browser-based tool without a server backend. This is the same limitation all free online editors have.

Does the file get uploaded anywhere?

No. The PDF is loaded entirely in your browser memory using PDF.js. All annotations are drawn with Fabric.js and merged back into the PDF using pdf-lib — all client-side. Nothing leaves your device.

My annotation looks blurry in the download — why?

Annotations are rendered at screen resolution and embedded as a PNG overlay. On high-DPI screens the annotations will look crisp. If you need higher fidelity, try zooming in your browser before annotating so the canvas renders at a larger pixel size.