Highlight any passage in a PDF — great for studying, proofreading, or flagging key clauses in contracts. Pick a color, drag across the text, done.
Highlight a PDFYellow, green, pink, blue, and orange — assign colors per topic or priority.
Drag across words and Konomic snaps to the text baseline for clean, professional-looking highlights.
Highlights save as standard PDF markup, visible in Acrobat, Preview, and every major reader.
Highlight, download, done — no account, no watermark, truly free.
For scanned PDFs run OCR first so the text becomes selectable, then highlight works normally. Konomic has a free OCR tool.
Yes. Reopen the PDF in Konomic and click the highlight to delete it. Each highlight is a separate, editable object.
Yes. They print exactly as they appear on screen, in the color you chose.
No. Highlight documents up to 50 MB on the free plan — hundreds of pages if needed.
Yes. All files are HTTPS-encrypted in transit and deleted from our servers within 1 hour.