Use the tool below
Highlight, comment, and markup PDF files in your browser. Free PDF annotator for review and collaboration.
Processing path for PDF Annotator
Upload the PDF (or Office file when conversion starts from documents). Server-side processing applies PDF annotator operations, then returns a downloadable result. Keep a master copy if you need to undo pipeline steps later.
How to use PDF Annotator
1. Upload PDF
2. Select highlight, text, or drawing tools
3. Save annotations
4. Download marked-up PDF
2. Select highlight, text, or drawing tools
3. Save annotations
4. Download marked-up PDF
Annotation Persistence
Highlights, stamps, and freehand notes must flatten or embed correctly for recipients. Some mobile viewers ignore certain annotation types. Export a flattened review PDF when the recipient only needs to read, not layer comments — use Flatten PDF after markup.
Collaboration Limits
This is not multi-user simultaneous review like shared Acrobat cloud. For concurrent legal review, use your organization’s review system; use online annotate for quick one-person markup pass. Merge marked-up pages in the PDF Organizer.
Document formats this tool expects
- Inputs: PDF
- Outputs: PDF
- Transport: HTTPS uploads
- Retention: temporary (~2 hours)—not permanent cloud storage
How PDF Annotator differs from typical alternatives
Compared with PDF annotation tools such as Adobe Acrobat Online: Adobe Acrobat Online requires Adobe accounts for saved annotations and cloud document storage rather than temporary anonymous processing. Big File Sharing focuses on free one-off jobs, no mandatory signup, and short-lived temporary files instead of account-centric project history.
Frequently asked questions about PDF Annotator
Is PDF Annotator free to use?
Yes. PDF Annotator is free with no paywalled export on this page. We fund operations with display advertising—not by selling upload contents.
What exactly can PDF Annotator process?
Inputs: PDF. Outputs: PDF. Highlights, stamps, and freehand notes must flatten or embed correctly for recipients. Some mobile viewers ignore certain annotation types. Export a flattened review PDF when the recipient only needs to read, not layer comments — use Flatten PDF a
How long are files from PDF Annotator kept?
Tool uploads and results are temporary and automatically removed after about 2 hours. Download anything you need before then; we do not offer permanent archives on this path.
Do I need an account for this PDF annotator?
No account is required for standard use of this tool. Open the page, run the job, download the result.
When should I use PDF Annotator instead of desktop software?
Use PDF Annotator for quick, one-off PDF annotator tasks on machines where installs are blocked or overkill. Prefer desktop/CLI tools for bulk automation, strict offline compliance, or multi-hour encoding jobs.
Privacy note: Transfers use HTTPS. Files for tools are temporary (~2 hours) and are not listed in a public gallery. Details: Privacy Policy.