Adobe Acrobat charges $24.99/month. DocuSign starts at $15/month. For most people who sign PDFs occasionally — a lease agreement, an employment form, a permission slip — that's an unreasonable price to pay for something that should take thirty seconds.
Here are the genuinely free methods that work, ranked by how practical they are.
Method 1: Use a browser-based signing tool (fastest)
The simplest approach requires no software, no account, and no payment. Modern browsers can process PDFs entirely on your device using JavaScript.
- Go to quickpdfsign.com
- Drop in your PDF
- Draw, type, or upload your signature
- Click to place it on the page
- Download the signed PDF
The whole process takes under a minute. Your file never leaves your device — there's no server involved. This is the right method for most people most of the time.
Method 2: Preview on Mac (built-in, always free)
If you're on a Mac, you already have a capable PDF signing tool built into the OS.
- Open the PDF in Preview
- Click the markup toolbar icon (pencil icon in the top right)
- Click the signature icon (looks like a cursive S)
- Draw your signature using the trackpad, or photograph a signed piece of paper with your webcam
- Click your saved signature to insert it, then drag it into position
- Save the file (⌘S)
Preview flattens the signature into the PDF, which is what you want. The output is a standard PDF that opens correctly everywhere.
Method 3: Adobe Acrobat Reader (free tier)
The free version of Adobe Acrobat Reader allows you to fill and sign PDFs. Note that this is not the same as Adobe Acrobat Pro (the paid version).
The limitation: Adobe's free signing is designed for PDF form fields. If the PDF doesn't have pre-built form fields, you may not be able to place a signature exactly where you want it. For non-form PDFs, browser-based tools are more flexible.
Method 4: Google Docs (workaround, limited)
You can open a PDF in Google Docs, but it converts it to an editable document — meaning your formatting will likely shift. You can insert a drawing as a "signature," but the output won't be a properly flattened PDF. This method is not recommended for documents that need to look professional.
What "free" actually means
Some tools advertise themselves as free but charge for downloading the signed version. Others are free for the first document, then require a subscription. Watch for:
- Watermarks added to the downloaded file
- "Free" but requires account creation (your data is the product)
- Upload limit (e.g., 2 free documents, then paywall)
- File size limits that kick in on larger documents
quickpdfsign.com has none of these restrictions — no account, no watermarks, no upload limit, and the tool runs locally so there's no server processing cost to pass on to you.
Do I need to pay for legally valid signatures?
No. Legal validity under the E-SIGN Act (US) and eIDAS (EU) is about intent and consent, not the software used to sign. A free tool produces a signature that carries the same legal weight as one created with a $300/year enterprise product.
The scenarios where paid services add value are specific: court-admissible audit trails, identity verification for high-value contracts, multi-party workflows with automatic reminders, or regulated industries with specific compliance requirements. For everything else, free is sufficient.
Which method should you use?
- Mac user: Try Preview first — it's already installed
- Windows or mobile user: Use quickpdfsign.com
- Need to sign a form with pre-built fields: Adobe Reader free tier handles this well
- Need multi-party signatures with audit trail: Consider a free tier of DocuSign or HelloSign for low-volume use