Add a signature to a PDF
blupdf lets you add signature to PDF files in three ways — draw it, type it or upload an image — then place it exactly on the signature line and export. Signatures are saved to your account so the next document takes seconds, and they are stored privately.
Start free — 1,000 creditsHow it works
- Step 1
Open the document
Upload the PDF you need to sign, or open one you already edited. Scanned forms work too.
- Step 2
Draw, type or upload
Draw with a mouse, trackpad or finger; type your name and pick a style; or upload a photo of your signature, which blupdf cleans up to just the ink.
- Step 3
Place and resize
Drag the signature onto the line and resize from a corner. It snaps lightly to nearby text so it sits straight.
- Step 4
Export
Download the signed PDF. The signature is a vector or image object in the file, sharp at any zoom.
Why blupdf
Reusable signatures
Create once, reuse on every document from your account. Delete them any time in Settings.
Clean uploads
A photo of your signature on paper is turned into transparent ink; no grey background rectangle.
Works on scans and forms
Place a signature on a scanned agreement or a flat form just like on a digital PDF.
Initials and dates too
Add typed initials or a date block next to the signature with the same tools.
Frequently asked questions
Is a drawn signature legally binding?
A drawn or typed signature is an image placed on the document. Whether that counts as a valid electronic signature depends on your jurisdiction and the agreement; blupdf does not provide identity verification or an audit trail like formal e-signature services.
Can I remove a signature later?
Signatures you added are objects: select and delete, or replace them while keeping the position. Signatures that were already part of the original PDF are page content and can be covered instead.
How much does signing cost?
Placing a signature costs 50 credits, and export is 20 credits per page. Moving or resizing a placed signature is free.
Can I sign on my phone?
Yes. blupdf runs in the browser, and drawing with a finger on a touch screen works well.