Mark and label pages
Add watermarks, page numbers, headers, footers, stamps, and labels.
- Add Watermark
- Page Numbers
- Header & Footer
- Add Stamps
Category hub
Edit & Annotate PDF Tools
Add useful information to PDF files without switching to heavy desktop software. Add watermarks, page numbers, headers, footers, signatures, form values, annotations, and other review-ready elements.
Use this hub when the PDF content should stay mostly intact but needs marks, labels, page decorations, review annotations, or form values added before sharing.
Choose the right tool
Fill and sign
Complete forms and add visible signatures before sending documents onward.
- Form Filler
- Sign PDF
- Form Creator
Review and annotate
Highlight, comment, remove annotations, or prepare a reviewed copy.
- Edit PDF
- Remove Annotations
- PDF Reader
Adjust page appearance
Crop margins, change colors, or standardize the visible page area.
- Crop PDF
- Text Color
- Background Color
Best tools for common tasks
Add Watermark
Add text or image watermarks to PDF files. Protect and brand your documents.
Local in browserAPI availableNo login needed
Page Numbers
Add page numbers to PDF documents. Customize position, format, and starting number.
Local in browserAPI availableNo login needed
Header & Footer
Add headers and footers to PDF documents. Include page numbers, dates, and custom text.
Local in browserAPI availableNo login needed
Sign PDF
Add electronic signatures to PDF documents. Draw, type, or upload your signature.
Local in browserNo login needed
Form Filler
Fill PDF forms online. Complete interactive PDF forms without printing.
Local in browserAPI availableNo login needed
Edit PDF
Edit PDF files online. Add text, images, annotations, highlights, and shapes to your documents.
Local in browserNo login needed
Crop PDF
Crop PDF pages to remove margins and unwanted areas. Trim PDF documents precisely.
Local in browserAPI availableNo login needed
Add Stamps
Add stamps to PDF documents. Use preset or custom stamps for approval, review, and more.
Local in browserNo login needed
Processing model
Editing and annotation tools are mostly local in the browser. API pages exist for repeatable watermarking, headers, page numbers, forms, flattening, metadata, and cropping workflows.
Local in browser
Most file-based PDF tools run directly in your browser with JavaScript or WebAssembly.
Server-side processing
Tools that need webpage capture, Chromium rendering, or backend automation disclose that before submission.
API available
Only tools with a real API landing page or API Docs support are marked as API available.
Recommended workflows
Watermark and protect
Mark a document, flatten if needed, then encrypt the final copy.
- 1Add watermark
- 2Flatten final marks
- 3Encrypt before sharing
Page numbers for review packets
Add headers, footers, and page numbers after page order is final.
- 1Organize pages
- 2Add page numbers
- 3Add header or footer
Form completion
Fill fields, sign, and flatten the result when the form is final.
- 1Fill form fields
- 2Add signature
- 3Flatten if needed
Crop scanned pages before OCR
Remove margins or scan borders before text recognition.
- 1Crop the page area
- 2Deskew if tilted
- 3Run OCR
Common issues
Annotations may remain editable
Flatten the PDF when comments, form fields, or marks should become part of the page content.
Watermarks should not hide important text
Use opacity and placement carefully so the document remains readable.
Page numbers should be added after reordering
Finalize merge, split, and delete operations before adding page numbers.
Form fields can behave differently across viewers
Flatten completed forms when recipients do not need to edit fields.
All tools in this category
Edit PDF
Edit PDF files online. Add text, images, annotations, highlights, and shapes to your documents.
Edit & Annotate
Sign PDF
Add electronic signatures to PDF documents. Draw, type, or upload your signature.
Edit & Annotate
Crop PDF
Crop PDF pages to remove margins and unwanted areas. Trim PDF documents precisely.
Edit & Annotate
Edit Bookmarks
Add, edit, and manage PDF bookmarks. Create navigation structure for your documents.
Edit & Annotate
Table of Contents
Generate a table of contents for your PDF. Create clickable navigation from bookmarks.
Edit & Annotate
Page Numbers
Add page numbers to PDF documents. Customize position, format, and starting number.
Edit & Annotate
Add Watermark
Add text or image watermarks to PDF files. Protect and brand your documents.
Edit & Annotate
Header & Footer
Add headers and footers to PDF documents. Include page numbers, dates, and custom text.
Edit & Annotate
Invert Colors
Invert PDF colors for dark mode reading. Convert documents to negative colors.
Edit & Annotate
Background Color
Change PDF background color. Add colored backgrounds to document pages.
Edit & Annotate
Change Text Color
Change text color in PDF documents. Modify the color of all text content.
Edit & Annotate
Add Stamps
Add stamps to PDF documents. Use preset or custom stamps for approval, review, and more.
Edit & Annotate
Remove Annotations
Remove annotations from PDF files. Delete comments, highlights, and markup.
Edit & Annotate
Form Filler
Fill PDF forms online. Complete interactive PDF forms without printing.
Edit & Annotate
Form Creator
Create fillable PDF forms. Add text fields, checkboxes, and dropdowns to documents.
Edit & Annotate
Remove Blank Pages
Automatically detect and remove blank pages from PDF documents.
Edit & Annotate
PDF Reader
Free online PDF reader. View, navigate, zoom, rotate, and print PDF documents directly in your browser.
Edit & Annotate
Related guides
Developer APIs
FAQ
Can I edit PDFs without uploading them?
Most edit and annotation tools run locally in the browser for website use, especially watermarks, page numbers, signatures, forms, and comments.
Which edit tools have API pages?
Watermark, header and footer, page numbers, form filler, crop, flatten, and metadata workflows have real API landing pages.
Should I flatten after adding annotations?
Flatten when the annotated copy is final and recipients should not change comments, form fields, or visible marks.
Why are design-only utilities not shown here?
This hub is limited to PDF editing and annotation tools. Design helpers that do not modify PDF files are excluded from the PDF category hub.