About StickPDF
Last updated: July 27, 2026
StickPDF is a free web tool for placing signatures, stamps, and photos onto a PDF and saving the result as a new PDF. Nothing to install, no account to create.
Why it exists
Receiving a contract or a quote as a PDF and needing to add one signature before sending it back is an everyday task. Yet doing something that simple usually meant buying a PDF editor, printing the document and scanning it again, or uploading the file to a website you had never heard of.
That last option was the uncomfortable one. Contracts contain commercial terms, pricing, and personal contact details, and uploading one meant trusting a sentence like "files are deleted after one hour" that you have no way to verify.
StickPDF takes a different approach: it never sends your file anywhere.
How it works
A modern browser is a capable runtime in its own right. StickPDF reads your PDF (with pdf.js) and writes the new one (with pdf-lib) entirely in JavaScript on your device. The server's only job is to hand your browser the page and its scripts; your document has no reason to travel in the other direction, and it doesn't.
You don't have to take that on faith. Open your browser's developer tools (F12), watch the Network tab, and open a PDF — nothing carrying your file goes out. Or load the page, disconnect from the internet, and keep working.
What it does
- Open a PDF and preview every page — via the button or by dragging the file into the window
- Add PNG and JPG images — drop one exactly where you want it, or paste a copied image with Ctrl+V
- Drag to reposition, pull the corner handle to resize
- Remove white backgrounds — make the white paper behind a scanned signature transparent, reversible at any time
- Copy and duplicate an image to repeat it across pages
- Download the finished PDF
- Works on phones and tablets; Korean and English; dark mode
What it doesn't do
Stated plainly: StickPDF does not merge, split, or compress PDFs, convert to Word, run OCR, edit existing text, or produce certificate-based digital signatures. The goal is to do one thing — putting images onto pages — properly.
Note too that a stamp or signature image added this way is a visual mark and carries no guaranteed legal effect. See the Terms of Use for more.
Cost
It's free. Hosting and domain costs are covered by advertising shown on the site. Those ads have no connection to the contents of your documents, and they do not change the principle that your files never leave your browser.
Contact
Bug reports, feature suggestions, and anything else are welcome at ojw0630@gmail.com. If something went wrong, telling us which PDF caused it and which browser you were using makes it far easier to track down.
New here? The guides are a good place to start.