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PDF Editor

Add text, images, highlights and white-out boxes on top of your PDF and place them where you want. It overlays elements (it does not edit the existing text). Everything stays in your browser.

How PDF Editor works

PDF Editor lets you annotate a PDF by adding text boxes, placing images, drawing highlight rectangles, or placing white-out boxes over content you want to obscure. When you are done, you download a new PDF with all the additions written permanently into the page content via pdf-lib, running inside your browser. The document never travels to a server.

The tool works on top of the rendered page: it does not modify the underlying PDF content streams directly when you place an annotation, so you can reposition elements before committing. When you download, pdf-lib bakes all the overlay elements into the page. Text added this way is a visual layer, not appended to the original text stream, so the new text and the original text are separate. White-out boxes are opaque rectangles drawn over the content; they obscure content visually but do not alter the underlying data in the page stream. If you need to permanently redact sensitive content beyond visual coverage, a dedicated PDF redaction tool with content-stream editing is more appropriate.

Written by Bastien Sulyan

How to use PDF Editor, step by step

  1. Load your PDF into the editor.
  2. Choose a tool from the toolbar: add text, insert image, draw highlight or add white-out.
  3. Click on the page to place the element, then drag to reposition or resize it.
  4. Repeat for as many annotations as you need across any pages.
  5. Click download to receive the final PDF with all annotations baked in.

Common use cases

  • Add clarifying comments or correction notes on top of a PDF before returning it for revision.
  • Insert a company logo or stamp image onto the first page of a document.
  • Highlight key paragraphs in a PDF before sharing it with a colleague for review.
  • Cover personal data fields with white-out boxes on a form template before distributing it publicly.

Frequently asked questions

Are annotations removable after I download the PDF?

Once downloaded, the annotations are baked into the page content stream and are not stored as a separate layer that can be toggled off. A skilled PDF editor could attempt to remove elements, but they are not trivially separable from the page in a standard viewer.

Does white-out permanently delete the content underneath?

A white-out box draws an opaque rectangle over the page, which hides the underlying content visually. However, the original content stream is not modified. A PDF editor that disables or removes the rectangle could reveal the original content. For genuine redaction of sensitive data, use a tool that physically removes the content from the page stream.

Can I edit the original text in the PDF using this tool?

No. The editor adds overlay elements on top of the page. It does not modify the original text streams in the PDF. If you need to change existing text, a PDF with an editable source (such as a Word document) is a better starting point.

Does my PDF get sent to a server while I am editing?

No. The page rendering, element placement and final PDF assembly all happen inside your browser tab. Your document stays in local browser memory throughout the editing session. Nothing is transmitted to Sunasty or any other server.

What image formats can I insert into the PDF?

The tool supports PNG and JPG images for insertion. PNG preserves transparency, which is useful for logos. Images are embedded into the page at the size and position you set.

Can I edit multiple pages in one session?

Yes. Navigate between pages using the page controls and add annotations to each page independently. All changes across all pages are included when you click download.

Does the editor add its own watermark to the downloaded PDF?

No. Only the text, images and highlights you place yourself are baked into the page. Sunasty never stamps its own logo, name or promotional watermark on your document.

Can I annotate a PDF on my phone?

Yes, placing text boxes, highlights and white-out rectangles works with touch input, though dragging small elements precisely is easier with a mouse or a stylus than with a fingertip on a small screen.