Sign PDF

Draw or type a signature onto any PDF.

or click to browse from your device

Supports PDF documents · up to 100 MB free

How to sign a file with Fileflo

Four simple steps — no software to install.

Drag & drop your PDF onto the box above, or click to browse. Files stay in your browser.

Fine-tune sign options like quality and format to get exactly the result you want.

Hit Sign Now and Fileflo processes your file in seconds — no waiting in a queue.

Grab your new file with one click. Compare the before & after, then you're done.

Everything you need to know about Sign PDF.

Is Sign PDF free to use?

Yes — Sign PDF is completely free with no watermarks and no daily limits. Fileflo Pro removes ads and unlocks larger file sizes and batch processing.

Are my files safe and private?

Absolutely. Sign PDF runs entirely in your browser — your files never get uploaded to a server.

What file types are supported?

Sign PDF works with PDF documents and more. If you need another format, try our other pdf tools.

Is there a file size limit?

Free users can process files up to 100 MB. With Fileflo Pro there's no limit, plus you can batch-process many files at once.

More ways to flow your files through Fileflo.

Reduce PDF file size for easy sharing.

Combine multiple PDFs into one file.

Extract pages or split into separate files.

Convert PDF into editable Word documents.