Edit PDF Online
Add text, highlight, draw shapes, freehand sketch, sign and stamp any PDF directly in your browser — PDF.js renders pages visually, PDF-lib writes all annotations into the real PDF binary. No sign-up, no upload, 100% private.
Our free online PDF editor lets you edit PDF files directly in your browser — add text annotations, highlight content in any colour, draw freehand, insert rectangles and ellipses, draw arrow lines, sketch signatures, place professional stamps, and insert images onto PDF pages. Unlike tools that upload your file to a server, this editor uses PDF.js for pixel-perfect page rendering and PDF-lib to write annotations into the real PDF binary as native PDF graphics. Whether you need to annotate PDFs online free, highlight a research paper, sign a contract, or add notes to any document, this tool is 100% private with no sign-up required.
PDF Editor — Add Text, Highlight, Draw, Sign
Upload PDF › Pick a tool › Annotate pages › Save annotated PDF › Download
Your file never leaves your device • 100% private • No sign-up
How to Edit a PDF Online
Open Your PDF
Drag and drop any PDF onto the upload zone or click Open PDF File. PDF.js immediately renders every page locally in your browser — you see the exact visual content with fonts, images and layout all preserved. Your file never leaves your device.
Annotate with 9 Tools
Select a tool: Add Text, Highlight, Freehand Pen, Rectangle, Ellipse, Arrow Line, Signature, Stamp, or use Select mode to pan. Change colour from the palette, adjust font size and stroke width. Navigate multi-page PDFs using the page thumbnail panel.
Save Annotated PDF
Click Save PDF — PDF-lib reads all canvas annotations and writes them into the real PDF binary as native PDF graphic operations (drawText, drawLine, drawRectangle, drawEllipse). The annotated PDF downloads immediately with all annotations embedded permanently.
9 Professional PDF Editing Tools
Add Text
Click anywhere on the page to place a text box. Type your annotation, choose colour and font size. Text is written as native PDF text graphics by PDF-lib.
Highlight
Draw highlight rectangles over any content with adjustable opacity. Use yellow, green, pink, or a custom colour to highlight text, numbers, or any area.
Freehand Draw
Draw smooth freehand strokes anywhere on the page. Circle items, underline text, sketch diagrams, or draw arrows. Each stroke is written as a series of PDF line objects.
Rectangle & Ellipse
Draw rectangles and ellipses to frame or call out content. Choose any border colour and stroke thickness. Embedded as PDF rectangle and ellipse vector objects.
Arrow Line
Draw directional arrow lines to point out or connect elements. Arrow head is rendered on the destination end, written as PDF line graphics.
Signature
Draw your handwritten signature freehand. The pen strokes are captured precisely and written as freehand PDF lines — no image upload required.
Stamps
Insert professional document stamps: APPROVED, REJECTED, CONFIDENTIAL, DRAFT, REVIEWED, SIGNED, VOID. Placed as bold bordered PDF text annotations.
Multi-Page Support
Navigate any PDF page by page using the thumbnail panel on the left or the navigation arrows. Annotations on all pages are saved together in the final PDF output.