PDFStream's PDF editor lets you add text, shapes, signatures, and highlights directly to an existing PDF — all in your browser, without converting the file to another format or losing the original content. Add a text box anywhere on the page to annotate a contract, fill in a form that doesn't have interactive fields, or label a diagram. Draw rectangles and lines for emphasis. Apply a digital signature image to sign a document. Highlight passages for review. Every annotation is embedded in the PDF structure and visible in any standard PDF reader. Use cases: signing a rental agreement or NDA without printing, annotating a technical drawing with notes, adding a stamp or approval mark to an internal document, filling out a scanned form, or marking up a report before sending it for review. The editor works on any modern browser without plugins. Changes are non-destructive to the original layers — you're adding a new annotation layer on top of the existing content.

How-to

1
Open
Upload your PDF.
2
Select Tool
Choose highlight, text, drawing, or signature.
3
Edit
Annotate your PDF directly.
4
Save
Download the edited document.

Frequently Asked Questions

Is this permanent?▼

Yes, once you save, the changes are embedded.

Can I add signatures?▼

Yes, use the signature tool.

Can I undo?▼

Yes, use the undo button.

Can I edit multiple pages?▼

Yes, move through all pages.

Can I edit existing text?▼

We are an annotator, not a word processor. You can cover text and add new text.

Can I draw?▼

Yes, use the drawing tool.

Custom fonts?▼

Standard web fonts are available.

Can I delete edits?▼

Yes, select and delete any added element.

Shapes available?▼

Yes, rectangles and more.

Is highlighting supported?▼

Yes.

Last updated: June 26, 2026

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