How to highlight a PDF online
Studying a contract, marking a lease, or annotating notes? You can drag highlights onto any PDF in your browser and download the marked-up copy — free, no account, nothing uploaded.
Just a web browser and your PDF. Everything happens on your device.
Highlight a PDF in 5 steps
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Open your PDF
Go to the PDF editor and open your file (click Open PDF or drag it in).
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Choose the Highlight tool
Select Highlight in the toolbar (or press H).
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Drag across the passage
Click and drag over the text you want to mark. Release, and the highlight is placed.
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Pick color and opacity
Use the panel to switch colors (yellow, or any color you like) and adjust how strong the highlight is.
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Export the marked-up PDF
Click Export to download a copy with your highlights baked in.
Highlights use a “multiply” blend — like a real highlighter, the words underneath stay crisp. Use different colors for different topics.
Frequently asked questions
Can I remove or move a highlight?
Yes — switch to the Select tool, click the highlight, then drag it or delete it.
Does highlighting change my original file?
No. You download a new marked-up copy; the original stays untouched.
Can I highlight in different colors?
Yes — pick any color and opacity in the properties panel.
Can I highlight on my phone?
Yes — drag with your finger, same as on desktop.
This guide is for general information. AmigoPDF is a free, in-browser utility; always keep a copy of your original files.