Free Online PDF Editor

Add watermarks, page numbers, and rotate pages on any PDF. All processing happens in your browser.

PDF never leaves your browser

Drop a PDF here or Browse File

PDF files only · processed locally · no upload

· pages · loading… ·

Rotation angle

Apply to

Watermark text

Position

Diagonal (across page) Centered Footer (bottom right)

Opacity:

SubtleBold

Position

Start numbering at

Enable at least one edit option above, then click Apply & Download.

What This PDF Editor Can Do

This tool uses the open-source pdf-lib library to modify your PDF entirely inside your browser. Three editing modes are available:

Rotate Pages — Change the orientation of all pages, only odd-numbered pages, or only even-numbered pages by 90°, 180°, or 270°. Useful for fixing scanned documents where pages were fed in the wrong direction.
Add Watermark — Stamp any text (DRAFT, CONFIDENTIAL, your company name, a copyright notice) onto every page. Choose diagonal, centered, or footer placement and adjust the opacity from subtle to bold.
Add Page Numbers — Insert a numeric page counter into the footer of every page. Choose left, center, or right alignment, and set the starting number (useful when a PDF is a chapter in a larger document starting at page 47, for example).

All three edits can be applied together in a single pass. The resulting PDF downloads directly to your device.

Privacy: Everything Stays Local

Unlike server-based PDF tools, nothing about your document is transmitted anywhere. The pdf-lib library loads once when the page opens, and from that point all processing happens in your browser's JavaScript engine. The tool works entirely offline once loaded. This is especially important for confidential documents — contracts, financial statements, medical records — where server uploads carry real privacy and compliance risk.

Limitations

No text editing: Changing, adding, or deleting existing text in a PDF requires a full PDF editing engine that is too large to run efficiently in a browser. For text edits, use a desktop application like LibreOffice Draw or Adobe Acrobat.
No image replacement: Swapping embedded images is not supported.
Encrypted PDFs: Password-protected PDFs cannot be loaded. Remove the password first using the original application.
Font rendering in watermarks: Watermarks use the standard Helvetica font embedded in the PDF. Custom fonts are not supported.

How to Use PDF Editor

1

Upload your PDF

Drag a PDF onto the upload area or click Browse File. The tool shows the file name and total page count.
2

Choose your edits

Toggle on the edits you need: rotate pages (all, odd, or even), add a text watermark with custom opacity, or insert page numbers at the bottom.
3

Apply and download

Click Apply & Download. Your browser processes the PDF entirely locally and saves the edited file — nothing is uploaded to any server.

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Frequently Asked Questions

No — never. All editing (watermarks, page numbers, rotation) is processed entirely in your browser using the open-source pdf-lib library. Your PDF bytes stay on your device the entire time. You can verify this by going offline after the page loads — the tool still works.

You can: add a text watermark (diagonal, centered, or footer position) with adjustable opacity; insert page numbers at the bottom-left, bottom-center, or bottom-right; and rotate pages by 90°, 180°, or 270° — either all pages, only odd-numbered pages, or only even-numbered pages. All three edits can be applied together in a single pass.

Encrypted or password-protected PDFs cannot be loaded by this tool. Open the PDF in Adobe Acrobat Reader, Preview (macOS), or a similar app, remove the password protection, and re-save it before uploading here.

Only the changes you apply will differ. Watermarks and page numbers are drawn as new content layers on top of the existing pages. Page rotation changes the viewing orientation. All other content — text, images, fonts, links, and form fields — is preserved exactly as in the original.

There is no hard limit enforced by the tool. Practically, very large PDFs (50 MB+) will work but may take a few seconds to process depending on your device speed. If a large file causes issues, try splitting it first with the PDF Split tool, editing the parts, then merging them back.