Annotate, highlight, draw, insert images, and even rewrite the text already on the page. A full editor that runs entirely in your browser, so documents never leave your device.
Drop a PDF into the editor and it opens right in your browser. Use Annotate mode to add text boxes, highlights, shapes, arrows, freehand ink, images, or whiteout. You can also switch to Edit text mode to click into the document's existing lines and rewrite them.
When you hit Save changes, FernPDF bakes every edit into a fresh copy of the PDF with WebAssembly and downloads it instantly. The original file never travels over the network, which makes it safe for contracts, medical records, and anything else you'd rather not hand to a server.
The editor supports per-object styling (font family, size, bold and italic, alignment, colors, stroke widths, and highlight opacity) with full undo and redo while you work.