Edit & Annotate

The Edit & Annotate category covers every way you might mark up or modify the content of an existing PDF. All tools run client-side; your files never leave your browser.

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Annotation and editing

PDF Editor A full annotation toolkit powered by an embedded PDF editor. Open up to 10 documents simultaneously in tabs. Features include:

• Highlight, underline, strikethrough, and freehand drawing
• Text insertion and inline commenting
• Shape tools — rectangles, circles, lines, and arrows
• Image insertion onto pages
• Built-in text search across the document
• Stamp tool for adding image stamps via the annotation toolbar

Redact Content Permanently remove sensitive content from PDF pages. Unlike annotation-based hiding, redaction burns the removal into the file so the original content cannot be recovered. Remove Annotations Strip all comments, highlights, links, and other annotations from a PDF in one pass. Flatten PDF Convert interactive form fields and annotations into static content. The PDF looks identical but fields can no longer be edited. Remove Blank Pages Automatically detect and delete blank pages from your PDF. Useful when scanning produces empty interleaved pages.

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Forms

Create PDF Form (Create Fillable Forms) Build fillable PDF forms from scratch using a drag-and-drop editor. Supported field types:

• Text fields
• Checkboxes
• Dropdown / select lists
• Radio buttons
• Signature fields

Forms are fully compliant with PDF standards and compatible with Adobe Acrobat, Preview, and other PDF viewers. PDF Form Filler Fill in existing PDF forms directly in the browser without installing any software. Also supports XFA forms — the XML-based form format used by some government and enterprise PDFs that standard viewers often refuse to render.

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Signatures

Sign PDF Add a handwritten-style signature to any PDF page. Three input methods:

• Draw — use your mouse or touchscreen to draw a signature
• Type — type your name and choose a font style
• Upload — upload a PNG, JPG, or WebP image of your signature

Digital Signature Add a cryptographic digital signature using an X.509 certificate. This is legally binding proof of who signed the document and that it has not been modified since signing. Supported certificate formats: Optional visible signature block: configure position, page, image, and custom text. Your private key never leaves the browser. Validate Signature Verify digital signatures embedded in a PDF. Displays the certificate subject, issuer, validity period, and whether the document has been modified after signing.

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Page appearance

Add Watermark Stamp a text or image watermark over every page (or a specific page range). Control opacity, position, rotation, and font settings for text watermarks. Header & Footer Add custom text to the top and/or bottom of pages. Supports dynamic fields like page numbers, total pages, and dates. Page Numbers Insert page numbers with configurable format, position, font, and starting number. Add Page Labels Apply PDF page labels with Roman numerals, alphabetic prefixes, and custom start values. Labels appear in the page panel of PDF viewers. Bates Numbering Add sequential Bates numbers across one or more PDF files. Used in legal discovery and document management to create a unique, auditable reference for every page. Crop PDF Trim the visible margins of every page or a selected range of pages. Crop boxes are set in page points.

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Color and visual effects

Invert Colors Invert all colors on every page — effectively creates a dark-mode version of your PDF. Useful for reading white-background documents in low-light environments. Scanner Effect Apply a visual filter that makes your PDF look like a photocopied or scanned document. Useful for matching the appearance of signed paper documents. Adjust Colors Fine-tune brightness, contrast, and saturation on PDF pages. Exposed as sliders with a live preview. Background Color Change the background color of PDF pages. Useful for converting white-background documents to a warmer tint for easier reading. Change Text Color Change the color of text content within a PDF. Operates on the text rendering instructions in the PDF page stream.

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Structure and navigation

Edit Bookmarks Add, edit, reorder, import, and delete PDF bookmarks (also called named destinations or the document outline). You can also export the bookmark tree to JSON. Table of Contents Generate a formatted table of contents page from the existing PDF bookmark structure and insert it into the document. Add Stamps Add image stamps to PDF pages using the annotation toolbar. Stamps are stored as annotations and can be repositioned after placement. Deskew PDF Automatically detect and correct tilted pages in scanned documents using an OpenCV-based algorithm. Works best on documents that were scanned at a slight angle.