Annotate & Sign — PDF Editor Online Free
Need to annotate and sign PDFs? FlexyPdf's PDF Editor includes a powerful annotate & sign capability that makes this easy. This page focuses specifically on the annotate & sign functionality — how it works, when to use it, and tips for getting the best results. All processing happens in your browser for maximum speed and privacy. No software to install, no account to create.
How to Use PDF Editor
Open Your PDF
Drag and drop a PDF file onto the editor, or click "Select PDF File" to browse. Files up to 50 MB are supported. The document loads instantly in your browser — nothing is uploaded.
Edit, Annotate & Sign
Choose a tool from the toolbar: add text, highlight areas, draw shapes, insert images, or place a digital signature. Click any annotation to move, resize, or delete it. Use Ctrl+Z / Ctrl+Y to undo and redo changes at any time.
Manage Pages
Use the page toolbar to rotate, duplicate, delete, or add blank pages. Drag thumbnails in the sidebar to reorder pages. Copy any annotation to all pages with one click.
Export & Download
Click "Save PDF" to embed all annotations and download the edited file. Choose "Optimize" to compress JPEG images and reduce file size. The downloaded PDF is fully compatible with Adobe Acrobat, Preview, and all standard readers.
Features
Text Annotations
Add formatted text boxes anywhere on the page. Choose font size, color, bold, italic, and alignment. Text is embedded as real PDF content — readable in any viewer.
Highlight & Draw
Highlight passages with 6 color presets, draw freehand with the pencil, or insert rectangles, circles, arrows, and lines to mark up documents precisely.
Digital Signatures
Draw your signature on a canvas pad or upload a PNG/JPG image. The signature is placed as a resizable, rotatable image annotation at the bottom of the page.
Page Management
Rotate, duplicate, delete, or insert blank pages. Reorder pages by dragging thumbnails. All structural changes use pdf-lib and preserve the original page content.
Undo / Redo History
Every annotation action is tracked in a 30-step history. Press Ctrl+Z to undo or Ctrl+Y to redo. History resets cleanly when a new file is loaded.
Optimized PDF Export
Standard export embeds annotations at full quality. Optimized export compresses JPEG images to 70% quality — ideal for reducing file size before emailing or uploading.
Benefits of Using PDF Editor
Completely Free
Use PDF Editor without any cost, limits, or hidden fees. No premium plans needed.
No Installation
Works directly in your browser. No software downloads or plugins required.
100% Private
Your files and data are processed locally. Nothing is uploaded to external servers.
Works Everywhere
Compatible with Chrome, Firefox, Safari, Edge on desktop, tablet, and mobile.
No Sign-Up
Start using the tool immediately. No account creation or email verification.
Always Available
Access this tool 24/7 from anywhere in the world, on any device.
Frequently Asked Questions
Complete Your PDF Tools Workflow
These free tools work seamlessly with PDF Editor to handle every step of your workflow.
PDF Merger →
Combine multiple PDFs into one document — useful after editing separate sections.
PDF Splitter →
Extract individual pages or page ranges from any PDF file.
PDF Compressor →
Reduce PDF file size before sharing or emailing.
JPEG to PDF →
Convert images to a PDF document you can then annotate in the editor.