Annotate PDF
Add pen marks, transparent highlights, and text labels on PDF pages with a local overlay workspace. Processing stays in your browser and files never leave your device.
About Annotate PDF
Annotate PDF is designed for people who want a practical browser-first workflow instead of uploading files to a third-party service just to complete a routine task. Annotate PDF runs in your browser for local, private document handling. Process files directly on your device without a server-side upload step for core workflows. Annotate PDF pages locally with pen, highlight, and text tools in a browser overlay workspace with no uploads.
Core processing runs in your browser, so file bytes stay on your device for local workflows. That matters when you are handling work files, drafts, forms, exported data, or other material that should stay under your control until you decide to share the result. It also removes the usual upload delay, which keeps the workflow lighter and easier to repeat when you need to adjust settings and try again.
In most cases, people use Annotate PDF to prepare documents quickly before sharing or archiving. handle privacy-sensitive files without third-party upload workflows. Before you publish, archive, or forward the output, do a quick review of the result because best-effort annotation. This tool embeds visible marks and labels but does not support collaborative comments.
How it works
- 1. Add the file or inputs you want to process in the Annotate PDF workspace.
- 2. Choose the settings that match the output you want before starting the run.
- 3. Run Annotate PDF directly in your browser and wait for the local processing step to finish.
- 4. Download the result and review it before sharing, archiving, or sending it onward.
Why use local browser tools
Local browser workflows reduce exposure for private files because the main processing path runs on your device instead of starting with an upload to a third-party service. That is useful when the document, image, text, or encoded payload contains work material, customer data, or anything you would rather review locally before sharing.
Browser-based tools are also direct. You open the file, run the operation, and download the result without waiting for remote queues or account-gated limits. You can review Plain.tools privacy claims in Verify Claims.
This page also includes answers to 3 common questions and links to 3 related workflows, so you can validate the process first and move to the next step without leaving the tool cluster.
Before you start
Upload
Upload one PDF and select a page to annotate with pen, highlight, or text tools.
Result
Apply annotations to embed them into a new PDF, then download the annotated file.
Local processing
Processing runs in your browser session. Files are not uploaded by default.
Limitations
This is a best-effort local annotator and does not include threaded comments or collaborative review.
Drop a PDF here, or click to browse
Local-only annotation workspace with no upload step
Click or drop files to continue
Stroke width (4px)
Pen colour
Frequently asked questions
Does Annotate PDF upload my files?
Core processing runs locally in your browser for this workflow, so the file or input stays on your device during the main operation.
How do I use Annotate PDF?
Open the tool, add your source file or input, choose the options you need, run the workflow, and download the result from the same page.
What should I check before sharing the output from Annotate PDF?
Best-effort annotation. This tool embeds visible marks and labels but does not support collaborative comments. Review the generated output once before sharing it so you can confirm formatting, completeness, and file quality.
Related resources
Continue with related tools, comparisons, and practical guides.