PDF Studio
Add text, annotate, sign, watermark, and organize — processed locally on your device.
Edit and annotate PDFs in your browser
Free, full-featured PDF editor. Add text notes, high-resolution drawings, custom signatures, watermarks, and page numbers with 100% client-side privacy.
Choose or drop PDF to begin
or drag and drop here
PDF only · up to 100 MB per file · processed locally in your browser
Draw & Highlight
Freehand pen drawing with custom stroke width and colors, plus semi-transparent highlighter rectangles for markup.
Sign & Stamp
Draw digital signatures directly on canvas or upload signature stamps. Place, rotate, and scale them on any page.
Text Overlays & Notes
Add crisp vector text boxes with customizable fonts, sizes, colors, and line wraps over existing document layouts.
Watermarks & Numbering
Batch-apply diagonal text watermarks, logo stamps, and sequential header/footer page numbers across all pages.
Multi-Page Organization
Navigate through thumbnails, reorder pages, rotate orientations, and export high-fidelity modified PDFs.
100% Private & Safe
Everything runs in WebAssembly and browser memory. No server uploads, no logins, and zero document telemetry.
How to Edit a PDF Online
- 1. Upload DocumentDrag and drop your PDF file or click to select from your device.
- 2. Annotate & EditUse the top toolbar to insert text, signatures, highlights, drawings, or watermarks.
- 3. Export & DownloadClick Export PDF in the top right to download your finished document instantly.
Frequently Asked Questions
- Is PDF Studio completely free?
- Yes. PDF Studio is free without accounts, trial periods, or exported watermarks.
- Are my confidential PDF documents private?
- Yes. PDF Studio executes all PDF parsing and rendering inside your local browser sandbox. No file data is sent to external servers.
- Can I edit existing text in the original PDF?
- PDFs are fixed-layout vector documents. You can add new text overlays, notes, and redactions over existing elements.