Edit PDF files directly in your browser. Add text, images, signatures, annotations, highlights, and shapes without installing software or uploading documents to servers.
or choose a file from your device
Unlike traditional online PDF editors that transmit your private documents across the internet to third-party cloud servers, KompressPDF runs entirely inside your web browser. Utilizing modern WebAssembly and client-side PDF rendering via PDF.js and pdf-lib, all text insertions, visual overlays, and page reordering take place in local memory. Your confidential files never leave your device.
Easily mark up contracts, school papers, and office forms with versatile productivity tools. Add custom text with full typography controls (fonts, sizes, colors, alignments). Draw freehand lines, highlight critical paragraphs with translucent color, place geometric shapes (rectangles, circles, arrows), and obscure sensitive details with real whiteout blocks.
Organize multi-page documents seamlessly using the visual page strip. Rotate pages 90 degrees clockwise, duplicate templates, delete unwanted sheets, or insert blank notes wherever needed. Reorder pages intuitively before exporting.
When you download your finished document, KompressPDF compiles your edits as a clean vector overlay on top of the original PDF stream. Original selectable text and embedded images remain crisp and intact rather than being flattened into a blurry bitmap.
Simply drag and drop your PDF into the upload zone above. Choose any tool from the toolbar (Text, Image, Draw, Highlight, Shapes, Signature, or Whiteout) to apply changes, then click 'Download PDF' to save your edited file immediately.
Yes. KompressPDF is completely free to use with no hidden subscriptions, trial limits, or account registration requirements.
Yes. Select the Text tool, click anywhere on your PDF page, and type your content. You can adjust the font size, font family, color, bold, italic, underline, and alignment directly from the properties bar.
Yes. Open the Signature tool to type your name in cursive script styles, draw your signature with a mouse or touchscreen, or upload a scanned signature image.
Yes. KompressPDF is built on a 100% client-side architecture. The document is parsed and rendered entirely in your browser's local memory and is never transmitted to any external server.
Yes. The editor is fully responsive on mobile devices and tablets, supporting touch scrolling, pinch zoom, and touch-based drawing and signature creation.
You can freely add new text, signatures, shapes, and whiteout over scanned pages. However, editing existing flattened bitmap text in a scanned image requires OCR reconstruction, whereas text-based PDFs allow seamless overlay markup.
Standards, official documentation, and technical references behind the guidance on this page.