Add comments, highlights, and annotations to PDF files. Free and browser-based.
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More about the PDF Annotator
Leaving feedback on a shared draft and actually changing the document's content are two different operations that shouldn't be confused, a reviewer highlighting a paragraph and dropping a comment on it needs the original text to stay exactly as it was, attributable, removable, and separate from the document itself rather than merged into it permanently. This tool adds comments, highlights, and annotations to a PDF without altering its underlying content, keeping review markup separate from the document it's attached to. Useful for leaving feedback on a shared draft that multiple reviewers need to see without touching the original wording, highlighting a specific clause in a contract for discussion before anyone edits it, or marking up a document for review while keeping the actual content completely unchanged.
Add comments, highlights, and annotations to PDF files. Free and browser-based. The PDF Annotator is one of 900+ free developer tools on Toolblip - all open to use without a signup.
How do I use the PDF Annotator?
Open the PDF Annotator on this page, paste or upload your input, and the result updates as you type. Use the copy button to grab the output, or adjust options to tune the result. Nothing you enter leaves your browser.
Is the PDF Annotator free to use?
Yes. The PDF Annotator is a free online tool on Toolblip - no signup, no account, no hidden usage limits. It runs in your browser and works on desktop and mobile.
Is the PDF Annotator safe and private?
Yes. The PDF Annotator processes your data entirely client-side, so nothing you paste is uploaded or stored on any server. It's safe to use with internal snippets, private keys for debugging, or any other sensitive content you'd rather not send to a remote service.
What kind of output does the PDF Annotator produce?
The PDF Annotator produces clean, formatted output that you can copy or download with a single click. The output is tailored to the tool's purpose — formatted code, converted data, transformed text, or processed media — and is ready for immediate use in your project or workflow.
Does the PDF Annotator work on mobile devices?
Yes. The PDF Annotator is designed to work on any device with a modern browser, including phones and tablets. The interface adapts to smaller screens, and the core functionality — paste input, transform, copy output — works the same way regardless of your device.
Are PDFs processed securely in the PDF Annotator?
Yes. The PDF Annotator processes PDFs entirely in your browser using client-side PDF libraries. Your files are never uploaded to a server, so you can safely work with contracts, invoices, and other confidential documents.
Can the PDF Annotator handle password-protected PDFs?
The PDF Annotator can open and process PDFs that do not have encryption restrictions. Password-protected or encrypted PDFs that require a decryption key may not be readable by client-side libraries. If you need to work with a locked PDF, unlock it first using the file owner's credentials.
Can I use the PDF Annotator offline?
Once the page has loaded, the PDF Annotator continues to work without an internet connection. Bookmark this page and return to it anytime - all logic runs locally.