Free Tool — No Upload Required

Annotate Your PDF

Highlight, underline, draw, add sticky notes, signatures, shapes, and redact content — all in your browser.

Drop your PDF here

or click to browse · Max 50MB

Ready to annotate
Select a PDF to begin
0 files 0 pages —
document.pdf
Your file stays on your device — 100% private
Use Ctrl+Z to undo · Ctrl+Shift+Z to redo
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Why Use AFFLIGO?
Fully Private
Zero server uploads. Your data stays on your device.
Rich Annotations
Highlight, draw, sticky notes, stamps, signatures & more.
Free & Unlimited
No sign-ups, no watermarks, no limits.
Read the Guide
How to Annotate a PDF
Step-by-step guide to highlight, draw, sign, and annotate PDFs online.
Read Guide →

How to Annotate a PDF

Step 1
Upload PDF
Drag & drop or click to select your PDF file. Files up to 50MB supported.
Step 2
Annotate
Highlight text, draw shapes, add sticky notes, sign, or redact content.
Step 3
Export
Download your annotated PDF with all changes preserved.

Frequently Asked Questions

How do I annotate a PDF online for free?
Upload your PDF, use the annotation toolbar to highlight, draw, add notes, or sign, then export the annotated PDF. All processing happens in your browser.
What annotation tools are available?
The tool includes highlight, underline, freehand drawing (ink), rectangle and circle shapes, free text boxes, sticky notes, signatures, stamps, and redaction.
Is this PDF annotation tool private?
Yes, 100% private. Your PDFs never leave your device. All processing runs locally in your browser using EmbedPDF technology.
Can I redact sensitive information from a PDF?
Yes, the tool includes true redaction capabilities to permanently remove sensitive text and content from your PDF before sharing.