Upload the PDF
Click the upload box or drag and drop a PDF from your computer or phone. The first page appears as a preview instantly.
Upload a PDF to sign
Drag and drop a PDF here, or click to select one. All processing stays in your browser.
Need help? Read the step-by-step guide. Use the Text and Shapes tools to add content to any PDF. Download your signed file before closing or refreshing this page.
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Upload a PDF using the button above to get started.
Signature in under a minute
How to sign a PDF in 4 simple steps
No account, no install, no uploads. Your document never leaves your device.
Create your signature
Draw in the signature pad with your mouse, trackpad, or finger, or upload an existing signature image saved on your device. PNG with a transparent background works best.
Position it on the page
Drag your signature to the exact spot, such as the signature line at the bottom. Add text boxes for dates, names, or notes, and resize any element before downloading.
Download the signed file
Click download. Your signature is written straight into the PDF and the finished file saves to your device, ready to email or store.
The whole flow takes about a minute. Add multiple signatures and text boxes to the same page, and switch between pages of a multi-page PDF using the page controls above the preview.
Why Signature?
Signature is a free, browser-based tool for adding signatures and text to PDF files. It is built around one idea: your documents should not have to leave your device.
Everything runs locally. The document is shown as a preview in your browser, and your signature is written straight into the file. The original PDF and your signature never leave your device and are never sent to a server. When you close the tab, all data is gone.
There is no sign-up, no email, and no payment. There are no daily limits and no watermark on the files you download. The tool also works on phones and tablets, so you can sign a document from anywhere with a browser.
Signature was made for common everyday tasks: signing a contract, adding a date or name, or adding a note to a page. If you need a fast, private way to put a signature on a PDF, this tool covers it.
Frequently asked questions
Is Signature really free?
Yes. The tool has no cost, no account, no daily limit, and no watermark. There are no paid tiers and no features locked behind a subscription.
Do my PDFs get uploaded anywhere?
No. The PDF is processed entirely on your device. The file is never sent to a server. Saved signatures are cached temporarily in session storage on your device only.
Can I add text to a PDF?
Yes. Use the Text tool to type on the page, choose a font family, set the size from 8 pt to 72 pt, and apply bold, italic, or a color. Drag the text where you need it.
Can I sign a PDF on my phone?
Yes. The layout adapts to small screens and the signature pad accepts touch input. Open the tool in Safari on iOS or Chrome on Android and draw your signature with a finger.
What signature image format should I upload?
A PNG with a transparent background is best because it overlays cleanly without a white box. If your image has a white background, remove it with an image editor before uploading.
Does signing change the original PDF?
The signature and text are placed on top of the existing content, and edited form values are baked in. The original pages, layout, and quality are preserved; scripts, actions, and attachments are stripped on export.
Can I fill interactive form fields?
Yes. Text fields, checkboxes, dropdowns, and radio buttons in fillable PDFs can be completed directly, and the values are saved into the downloaded file.
Is my signature saved?
Your drawn signatures are stored in the browser so you can reuse them while the tab is open. They are cleared when the tab closes and are never sent to a server.
What is the maximum file size?
Files up to 100 MB are accepted. Very large PDFs may use more memory in your browser, so performance depends on your device.
Can I add more than one signature?
Yes. Add several signatures and text boxes to the same page, and place them wherever you need them.