Select or drop a PDF to highlightLet go to add your file
Private. Files never leave your device.
Open a paper and drag along a line to highlight it, the way you would with a marker. Rest on a highlight to change its color or add a comment beside it. Free, open source, and your file stays on your device.
Select or drop a PDF to highlightLet go to add your file
Private. Files never leave your device.
Turn on airplane mode and give it a try. It still works.
How it worksA PDF highlighter should feel like the marker on your desk. Open the PDF and drag along the lines you want to keep: the highlight stays straight along the line, works on scanned pages too, and everything runs in your browser.
Highlight as many pages as you like, with no account and no watermark. Highlights and comments are saved as standard PDF annotations, so they open in other PDF viewers too.
It's open source under the MIT license, so anyone can read the code, fork it on GitHub, or share it. Simple PDF tools should be free for everyone.
Yes. Like every tool on PDkef, it is free with no signup, no watermark and no page limit.
No. The highlighting, the comments and the download are all made in your browser. Your file never leaves your device, and there is no processing server.
Open the PDF and drag along the line you want, as you would with a marker. Drag down to carry the highlight onto the next lines. Double-click marks one word and a third click its whole sentence.
Rest the pointer on it, or tap it on a touch screen. Its toolbar offers six colors, underline, Comment and Delete. Whatever you pick becomes your marker for the next lines.
Yes. The highlight reads the lines from the page image itself, so a scanned page or a photo of a book page works too, with no text layer needed.
Yes. It runs in Safari and Chrome on a Mac and in Safari on an iPad. On a touch screen, tap a highlight to open its toolbar.
Yes. Highlights and comments are saved as standard PDF annotations, so they show in any PDF viewer, and they come back editable when you open the file here again.
Yes, the way you annotate when you read: highlight or underline the lines that matter and add a comment to any highlight. They are saved as standard PDF annotations. For text boxes, shapes or a signature, use Sign & Fill PDF.
Yes. On a right-to-left page the highlight follows the line from right to left, and a clicked word or sentence fills in from its first letter.
Every one of these runs on your device, free, with nothing uploaded.
Also: Extract PDF Pages · Rotate PDF · Remove PDF Pages · Add Page Numbers to PDF
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