How to use the Digital Sign PDF
- Upload your file. Click “Choose file” or drag and drop your PDF files (you can add several and reorder them).
- Choose your options. Adjust the settings: Certificate password, Signer name, Reason, Location and Show visible signature box. The defaults work well for most files.
- Process the file. Click “Sign digitally”. Your file is processed securely on our server and deleted immediately afterwards.
- Download the result. Preview or download the output. For multiple files use “Download all (ZIP)”.
About this tool
Merge, split, compress, convert, edit, sign, protect and analyse PDF files online.
Read the complete Digital Sign PDF guide
Frequently asked questions
Is the Digital Sign PDF free to use?
Yes. The Digital Sign PDF on Gemma-4 is 100% free with no sign-up, no limits and no watermark. An optional free account lets you save favourites.
Are my files safe?
Yes. Files are processed in memory on our secure server over HTTPS and are deleted immediately after processing. We never store or share your documents.
Does it work on mobile phones?
Absolutely. The Digital Sign PDF is fully responsive and works on Android, iPhone, tablets and desktop browsers such as Chrome, Edge, Safari and Firefox.
Is there a file size limit?
You can upload files up to 50 MB each. For very large files, splitting them first gives faster results.
Who is the Digital Sign PDF useful for?
It is popular with students submitting assignments, office workers handling documents, government-form applicants — anyone who needs quick, reliable help with working with PDF documents quickly and securely.