My signature has streaks or holes — what gives?

The "Aggressive" threshold may be removing faint pen marks. Switch to "Conservative" to keep off-white pixels visible. Re-photograph with stronger lighting and a darker pen for the best results.

Is this a digital signature with a certificate?

No — this is an image-based signature, like signing on paper. For PKI/cert-based signatures, use Adobe Acrobat or DocuSign.

Can I sign multiple pages?

Run the tool once per page in v1 — pick a different page number each time.

Quick Sign (Mobile-friendly)

Sign a PDF using a phone photo of your handwritten signature on a piece of white paper — no need to manually create a transparent PNG first.

Your files never leave your browser. All processing happens on your device — nothing is uploaded.

1. Upload your files (min 2)

Need at least 2 files (have 0).

How does the Quick Sign (Mobile-friendly) work?

Sign a PDF straight from a phone photo of your signature — no need to upload a transparent PNG. Take a photo of your signature on a clean white piece of paper, drop it in along with the PDF, and the tool removes the white background using a luma threshold so the signature pastes cleanly onto the page. Pick a placement (bottom-right is the convention), set a width, and download. Differs from the regular Sign PDF tool, which expects you to provide an already-transparent PNG. If your signature comes out patchy, try the Conservative threshold; if you see ghosty white edges, try Aggressive.

🔒 Security & Privacy

All processing happens on your device. Your files never leave your browser, never touch our servers, and are not stored anywhere. Close the tab and the file is gone.

📱 Use it on any device

Works in any modern browser — Mac, Windows, Linux, iPhone, Android, and tablets. No installation, no app to download. Just open the page and start.

⚡ Quick & easy

Drag, drop, click. Most files process in seconds, not minutes. No watermarks added to your output, no per-day limits, and the tool always shows the result before asking you to download.

🎁 Always free, no signup

Free to use, every time. No account creation, no email required, no “trial” that converts to a paid plan. We make money from ads so you don’t have to pay.