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Annotate & Mark Up PDF — Free & 100% Private

Add text, highlights, shapes and signatures on top of your PDF — right in your browser.

Your file never leaves your device — nothing is uploaded

PDF Editor

Add text, draw shapes, and annotate your PDF. All edits are applied locally.

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Need to fill in a form, highlight a passage, drop a comment or add your signature to a PDF? FlySnail's PDF annotator lets you add text, highlights, shapes and signatures on top of any page — entirely inside your browser. Your file is read on your own device and never uploaded. It's free, needs no account, and adds no watermark. (Note: this tool adds annotations on top of the page rather than rewriting the original underlying text.)

How to annotate a PDF

  1. Add your PDFDrag it in, or click to browse.
  2. Add annotationsText, highlights, shapes or a signature on top of the page.
  3. Place & adjustDrag and resize them where you want.
  4. DownloadExport the annotated PDF. Nothing was ever uploaded.

Why use FlySnail to annotate PDFs

100% private — no upload
Text, highlight, shapes & sign
Instant — no queue
Free — no sign-up
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Frequently asked questions

Is annotating PDFs free?
Yes — completely free, no sign-up, no watermark, no daily limit.
Is my PDF uploaded to a server?
No. Annotation happens locally in your browser. Your file never leaves your device.
Can I edit the existing text in the PDF?
This tool adds annotations on top — text boxes, highlights, shapes and signatures — rather than changing the original text underneath. It's ideal for filling, marking up, signing and commenting.
Will my annotations stay in the file?
Yes. When you export, your annotations are written into the downloaded PDF and appear in any viewer.

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