How does browser PDF editing work?

Each page is drawn with PDF.js on a bottom canvas. A Fabric.js canvas sits on top for annotations. Saving composites both layers into a new PDF with pdf-lib. Original vectors become part of the flattened image unless you only add overlays.

No. Everything runs locally in your browser.

Edit PDF

Add text, drawings, highlights, shapes, images, or a watermark on top of your PDF. The original page is rendered below; edits live on a Fabric.js layer. Save flattens everything into a new PDF — no upload.

Drop a PDF here or click to upload

Large files or many pages may be slow. Text in the PDF is not re-editable as vectors after save.

Select text box Use the list if clicks miss (zoom can affect the overlay). Then double-click the text or press F2 to type. Original PDF text is an image — only boxes you add are editable.

Font Size Color Bold Italic Opacity Click empty space to place text (then type). After placing, switch to Select and double-click to edit anytime.

Brush Color Opacity Mode

Preset Opacity Size

Shape Fill Fill op. Stroke Stroke w. Drag on the page to draw.

Opacity Use Image button in toolbar to upload.

Text Apply to

Size Only removes annotations, not the PDF background.

Notes

How do I edit text I added?

Choose Select, click the text once to select it, then double-click or press F2 (or use “Edit selected text”). Watermarks are editable the same way.

Will my PDF stay vector?

Saving rasterizes each page (PDF + your edits) into images inside a new PDF. For archival vector text, edit in a desktop editor.

Libraries

PDF.js renders the bottom layer; Fabric.js handles annotations; pdf-lib builds the download.