中文 · Qiling Tools

Annotate and highlight a PDF online

Marking key points, adding notes and circling problems takes only a few tools. Highlight, underline and strikethrough snap to text lines, and every mark is drawn in your browser.

How it works

  1. Open the PDF Choose a file or drop a PDF onto the page.
  2. Pick an annotation tool The toolbar has highlight, underline, strikethrough, text, rectangle, ellipse, line, arrow and pen, plus check, cross and date stamps.
  3. Mark up the page Drag across text to snap to the text lines, or click to take a whole line; draw the other shapes by dragging. Selected marks can change color, width and opacity, and resize from the corners.
  4. Export Click "Export PDF" and all annotations are drawn into the new file.

Good to know

  • Undo and redo any time (⌘/Ctrl+Z); a selected mark can be copied, brought to front or deleted.
  • A cover box hides content with a colored block, but the original stays in the file underneath, so it is not secure redaction.
  • Annotations are drawn onto the page rather than stored as PDF annotation objects, so they show up in any PDF reader.

FAQ

How do I highlight text in a PDF?

Choose the Highlight tool and drag across the text; the highlight snaps to the text lines. A single click selects a whole line.

Will my annotations show in other PDF readers?

Yes. They are drawn into the exported pages, so any PDF reader shows them.