PDF Highlighter
FreeAdd highlights and colored annotations to PDF documents
Open a PDF to edit
Drag & drop or click to browse
Edit text · Add shapes · Highlight · Redact · Sign · Draw
About PDF Highlighter
When you are reviewing or studying a PDF, marking the parts that matter makes everything easier to find later. A highlighted line or a colored annotation draws the eye straight to the key point, just like a marker on a printed page.
This tool adds highlights and colored annotations to your PDF. You mark the passages you want to emphasize, apply your colors, and download a document with your highlights saved in place. It is free, runs in your browser without an account, and adds no watermark. It is a simple way to flag important text for yourself or for whoever reads the document next.
Common uses
- Highlighting key clauses in a contract for review
- Marking important passages while studying notes
- Flagging sections that need attention from a colleague
- Color-coding parts of a document by topic
- Emphasizing deadlines or figures in a report
How to use
- 1
Upload your file
Click the upload area or drag & drop your file. Supports APPLICATION/PDF. Up to 50 MB.
- 2
Click "Process — PDF Highlighter"
Click the process button. Your file is converted instantly on our secure servers.
- 3
Download your result
Preview and download your converted file. No watermarks, no quality loss, no expiry.
Why ToolHub?
- 100% Free — no account needed
- Works in your browser — no software required
- Instant results
- Secure and private
- No data stored
- Simple to use
FAQ
Can I use different highlight colors?
Yes. You can apply colored highlights and annotations to mark different parts of the document.
Do the highlights stay in the saved file?
Yes. Your highlights are saved into the downloaded PDF so they remain visible to anyone who opens it.
Will highlighting cover up the text?
No. Highlights sit over the text so it stays readable while standing out.
Can I use PDF Highlighter on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.