How to use Sign PDF
- Choose one PDF within the documented browser limits.
- Review pages, settings, and the actual preview.
- Create the result, compare it with the source, then download or reprocess.
Sign PDF Online
Draw, type, or upload visible signature items and place them on reviewed PDF pages without uploading the document.
Processed locally in your browser. Document and signature bytes are not sent to OpenFileTools.
Add a PDF sourceOne PDF · 100 MB and 300 page safety limitsChoose from your device or drag and drop a file here.
Draw, type, or upload visible signature items and place them on reviewed PDF pages without uploading the document. The original remains unchanged, and the workflow shows a source preview and validated result before download.
How OpenFileTools processes it
Local processing, explicit choices.
The PDF and rendering libraries load only on the relevant tool route. Operations run in browser memory, preserve structure where the operation permits, and reopen the result before download.
Questions, answered.
Is my PDF uploaded?
No. The current workflow keeps document bytes in this browser tab.
Does the original change?
No. A separate result is generated for review and download.
Will an existing digital signature remain valid?
Do not assume so. Any PDF modification can invalidate a cryptographic signature.
Related guide
Read the related guide