PDFStack Tool
Edit PDF Online — Add Text & Annotations Free
Add text overlays, annotations, and custom content to any PDF page without Adobe Acrobat. PDFStack's PDF editor works entirely in your browser — open your PDF, add what you need, and download the modified file in seconds.
Open Edit PDF →
No file uploads
No account required
Free to use
Private & secure
Why edit PDFs in PDFStack?
Acrobat Pro costs hundreds of dollars per year. PDFStack gives you essential PDF editing capabilities — text overlays, annotations, and content additions — for free, directly in your browser, with zero file uploads.
How to edit a PDF
- 1Choose Edit PDF in PDFStack.
- 2Upload your PDF.
- 3Enter the text you want to add, choose the page, font size, and X/Y position.
- 4Click Apply Text and download the updated PDF.
All processing happens locally in your browser — no files are uploaded to any server.
Common Uses
Adding a stamp or label to a PDF, inserting reference numbers, annotating a document with notes, overlaying a date or signature block.
Frequently Asked Questions
Can I edit existing text inside the PDF?
PDFStack adds new text overlays. For full content reflow editing, convert to Word first using the PDF to Word tool.
How do I position text precisely?
Use the X% and Y% position fields — 0% is left/bottom, 100% is right/top. Adjust and re-process until positioned correctly.
Can I add images?
Currently PDFStack supports text overlays. Use the Sign PDF tool to stamp image-based signatures.
Is my PDF private?
Yes — editing happens entirely in your browser.