Annotate PDFs in Your Browser
Highlight text, add sticky notes, draw shapes, insert images, and sign documents — all without uploading files to a server. Your PDFs stay private on your device.
Annotate & Highlight PDFs
Mark assignments, client contracts, and manuals with notes, highlights, images, and signatures—all in your browser.
How to Annotate PDFs in Your Browser
Annotating a PDF used to require desktop software or uploading your documents to third-party servers. With this browser-based tool, you can mark up any PDF instantly without installing anything or creating an account.
Annotation tools available: Use the highlighter to mark important passages in yellow, green, or any custom color. Add text boxes to insert typed notes anywhere on the page. Use the freehand drawing tool to sketch diagrams or circle key sections. Drop stamp icons or checkmarks for quick reviews.
Sticky notes and comments: Click anywhere on the document to insert a sticky note. Notes can be collapsed or expanded and are embedded directly in the exported PDF so recipients can read them in any PDF viewer.
Shapes and lines: Draw rectangles, circles, arrows, and straight lines to highlight diagrams, point to specific areas, or create visual call-outs. Adjust stroke color, width, and fill for each shape.
Privacy and security: No PDF is ever uploaded or sent to a server. All annotation processing happens locally in your browser. This makes the tool safe for confidential documents, legal contracts, and medical records.
Who Uses PDF Annotation
Students & Researchers
Highlight key passages in research papers, add margin notes to lecture slides, and mark up textbook chapters for exam review. Export a clean annotated PDF to share with study groups.
Business & Legal Professionals
Review contracts by highlighting clauses, add comment boxes with revision notes, and mark signature fields. All annotations are embedded in the final PDF for clean document handoff.
Teachers & Educators
Mark up student assignments, add feedback notes, circle errors, and underline important sections. Return annotated documents without sending originals to any cloud service.
Designers & Creatives
Drop comments and arrows on design mockups exported as PDF, mark revision areas, and collaborate on print layouts by annotating proofs before final approval.
Frequently Asked Questions
Will annotations be visible in other PDF viewers?
Yes. Annotations are embedded directly into the PDF file. Highlights, text boxes, shapes, and sticky notes will appear in Adobe Acrobat, Preview, Chrome PDF viewer, and any other standard PDF reader.
Is my PDF uploaded to a server?
No. Your PDF is processed entirely within your browser. Nothing is sent to any server. This tool is safe for confidential, legal, or medical documents.
Can I annotate scanned PDFs?
Yes. You can add highlights, drawings, and text boxes on top of scanned image-based PDFs. For text selection on scanned pages, use the Image to PDF tool with OCR enabled first to create a searchable layer.
Can I undo annotations?
Yes. Use the undo button or keyboard shortcut to remove the last annotation. You can also click on any annotation to select and delete it individually before exporting the final PDF.
Is there a page or file size limit?
There is no server-side limit. Since everything runs in your browser, performance depends on your device's memory. Most standard PDFs up to 200 pages and 50MB annotate without issues on modern devices.