Drop a file here
About Annotate PDF — Free Online Tool
Annotate PDF attaches a sticky-note comment to a page, with an author name on it, that readers open from their comments list.
Unlike the marking tools here, this writes a genuine /Text annotation object: a note icon at the coordinates you give, carrying the comment, the author name, a timestamp and a colour, registered against the page. Acrobat, Preview and Chrome all list it in their comment sidebar, and because it is a real annotation a reader can reply to it or delete it. One note is placed per page you select, all at the same spot and all carrying the same text, so a page-by-page review means one run per comment.
The note and the document it hangs on both stay on your machine. There is no shared review session and no copy left on a server.
Returning a draft with a reviewer note on the cover page, leaving a query on a specification for its author, flagging what changed for the next person in the chain, and recording why a document was sent back.
Also known as: sticky notes on pdf · comment on pdf · pdf markup · review document notes
When to use it
Review editorial drafts, legal revisions, and architectural blueprints with structured feedback.
How it works
Stores note icons on the page canvas and opens interactive comment sidebars in PDF readers.
Collaborative Review
Records author name and modification timestamp with each comment.
How to Use Annotate PDF in 4 Easy Steps
Follow this simple guide to process your files in seconds directly inside your browser tab.
Select or Drop Your PDF
Drag and drop your PDF directly into the Annotate PDF workspace above or click 'Choose files'. You can process up to 1 file in a single run.
Configure Your Preferences
Adjust the available optimization sliders, target formats, or custom options. Review editorial drafts, legal revisions, and architectural blueprints with structured feedback.
Instant In-Browser Execution
The client-side engine executes Annotate PDF locally on your device hardware with zero server latency and 100% private in-memory sandboxing.
Preview & Download PDF
Inspect the processed file, compare file size savings or output quality, and click Download to save the finished PDF file directly to your disk.
Why Use Annotate PDF on ShortTrick
Engineered for maximum speed, strict privacy, and frictionless digital productivity.
100% Private & Local
Files processed with Annotate PDF never leave your computer or phone. Zero cloud uploads, zero tracking, and zero risk.
Blazing Fast Engine
Powered by compiled WebAssembly code running directly in your browser with sub-second execution for Annotate PDF.
No Paywall or Account Required
Annotate PDF is completely free with no hidden charges, watermarks, email signups, or artificial daily limits.
High-Fidelity Quality
Advanced algorithms preserve crisp vector text, clear colors, and structural layout integrity.
Generous 50 MB Size Limit
Handle files up to 50 MB and process up to 1 files in convenient batches with Annotate PDF.
Cross-Device Compatibility
Runs seamlessly in modern browsers on Windows, macOS, Linux, iOS (iPhone/iPad), and Android.
Supported Formats & Limits
Designed for high performance with browser-side memory guarantees.
50 MB
1
Frequently Asked Questions About Annotate PDF
Common questions regarding Annotate PDF, data privacy, file format compatibility, and usage limits.
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