PDF Edit & Annotate

Popular Free Local Processing

Free online PDF edit and annotate tool that adds text, rectangles, and highlights to specified pages, or uses solid rectangles to redact sensitive info. Supports custom coordinates, dimensions, color and opacity. All processing in your browser, files never uploaded, privacy-safe.

Drag files here, or

Select PDF file

max each 100.0 MB

Options

Edit type

Page number (from 1, blank = all pages)

X coordinate (pt, from bottom-left)

Y coordinate (pt, from bottom-left)

Color (hex, e.g. #FF0000)

How to Use

1 Select a PDF file
2 Choose edit type (Add text / Add rectangle / Highlight / Redact; text supports Chinese and English)
3 Set page, coordinates, dimensions, color and other parameters
4 Click "Edit PDF" button
5 Download the edited file when processing completes

FAQ

Q: Is adding Chinese text supported?

Yes. You can enter Chinese directly when adding text. The tool auto-renders Chinese characters as an image embedded into the PDF to ensure correct display.

Q: How are coordinates calculated?

The origin is the bottom-left corner of the page. X increases to the right; Y increases upward. Unit is points (1 pt ≈ 0.35 mm). A4 is 595 pt wide and 842 pt tall.

Q: Are files uploaded to the server?

No. All processing happens in your browser. Files never leave your device.

Q: How do I redact sensitive info?

Choose the "Redact sensitive info" type, set the coordinates and size of the area to redact, and a solid black rectangle will cover it.

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