How to Edit a PDF
- 1
Open a PDF and choose a tool from the editor toolbar.
- 2
Place overlays or apply page-level changes with undo and redo.
- 3
Export a new edited PDF and review it before sharing.
Edit PDF
Open a PDF to start editing
Drop a PDF here or choose Open PDF. Your document stays in this browser.
About this tool
Edit supported underlying text and add visible content locally.
PDFium replaces supported text objects. The editor also adds text, images, signatures, drawings, highlights, shapes, and page changes.
Scans, outlined letters, unusual encodings, and complex structures may not expose editable text.
Plan the next step
For simple repeated numbers, use Add Page Numbers instead of the full editor.
If you need editable document prose, compare PDF to Word and review the reconstructed DOCX.
Features
- Existing-text replacement
- Text and image overlays
- Drawing and shapes
- Visible signatures
- Page actions and undo/redo
Output and quality
Direct edits change supported text objects; additions become new page content.
Limitations
Supported text runs can be changed directly on the page. Scans, outlined text, missing glyphs and paragraph reflow may not be editable. Rectangles are annotations, not permanent redaction.
Tips for better results
- Keep the source file.
- Review replacements at high zoom.
- Check the export in PDF Reader.
Troubleshooting
Why can I not select text?
It may be a scan, outline, or unsupported encoding.
Why does replacement text differ?
The source font may not support the new characters.
Frequently asked questions
Can it edit existing text?
Yes, when the PDF exposes a supported text object.
Can it edit scans?
Not directly; no OCR runs in the editor.
Is a drawn signature verified?
No.
Can it permanently redact?
No.
Is the original altered?
No.
Can I undo?
Yes, during the session.
