Sign PDF Online —
Free & Private
Upload a PDF and your signature image to stamp it onto the document. Everything runs entirely inside your browser.
100% FREE · NO UPLOAD · SAFE & SECURE
1. Select PDF Document
Click to upload PDF
2. Select Signature Image
Click to upload Signature (PNG/JPG)
The signature will be placed at the bottom-right of the last page.
Tip: Upload a PNG with a transparent background for best results.
Comprehensive Guide to Digitally Signing PDFs
Digitally signing a PDF is the fastest and most secure way to execute contracts, fill out lease agreements, and handle official documents without the hassle of printing and scanning. Our browser-based tool allows you to overlay your signature onto any PDF document seamlessly.
Step-by-Step Instructions
- Upload Your Document: Click the "Upload PDF" button to select the contract or form you need to sign. The document will be loaded directly into your browser memory.
- Prepare Your Signature: You will need an image file of your signature. For the best visual result, use a PNG image with a transparent background.
- Attach the Signature: Upload your signature image using the second upload box.
- Sign and Download: Click "Sign Document." The tool will automatically stamp your signature onto the bottom-right corner of the final page of your PDF and generate a secure download link.
Security and Privacy First
When handling legal documents like NDAs or financial contracts, security is paramount. Unlike traditional online PDF editors that force you to upload your highly sensitive documents to a remote server, this tool processes everything locally. Using advanced client-side JavaScript, the merging of your signature and your PDF happens entirely on your own device. Your files are never transmitted across the internet, ensuring 100% data privacy.
Troubleshooting Signature Quality
If your signature looks sloppy or has a white box around it that covers the text of your PDF, you are likely using a standard JPEG image. JPEGs do not support transparent backgrounds. To fix this, you should convert your signature image to a PNG and use a background removal tool to make the background perfectly clear. This ensures only the ink of your signature is visible on the final document.
Common Use Cases
Freelance Contracts
Quickly sign NDAs, statements of work, and master service agreements without needing a paid Adobe subscription or a physical printer.
Real Estate Leases
Landlords and tenants can digitally execute rental agreements instantly. Just upload the final PDF, attach your PNG signature, and export the executed copy.
HR & Onboarding
Sign offer letters, direct deposit forms, and tax documents securely. Because processing is local, your SSN and salary details never leave your machine.
Frequently Asked Questions
Is this digital signature legally binding?
In most jurisdictions (including the US under the E-Sign Act), an electronic image of your signature applied to a PDF is considered a legally binding electronic signature for most business contracts. However, it is not a cryptographic 'Digital Certificate' which some government forms may require.
Can I move or resize the signature?
Currently, the tool automatically scales and places the signature cleanly at the bottom-right of the final page, which is the standard placement for contract execution. For best results, crop your signature image tightly before uploading.
Does this tool work on mobile?
Yes. You can use your phone to take a photo of your signature, upload it alongside the PDF from your files app, and sign the document entirely from Safari or Chrome on your mobile device.
More Tools
How to Sign PDF Documents Online Free
In today's digital workflow, knowing how to sign a document online quickly and securely is essential. Our platform provides a completely free and seamless experience to sign PDF online without needing to install heavy software. Whether you need to sign documents online free for a school form, a business letter, or a personal application, our tool is built to handle it instantly.
Why Use Our Online PDF Signer?
Many services charge monthly fees just to add your signature to a file. We built this online PDF signer to be universally accessible. You can upload any standard document and apply your online signature PDF stamp without limits. The process is straightforward, meaning you can sign PDF documents in a matter of seconds directly from your browser.
Maximum Privacy: Your Files Never Leave Your Device
When dealing with your private documents, security is your top priority. When you sign pdf online free using iFixImg, your files are never uploaded to our servers. Our tool utilizes modern WebAssembly technology to parse and merge your signature entirely within your computer's local memory. You get the convenience of a web tool with the security of an offline desktop app.
How to sign a document online:
- Select your file: Upload the PDF you need to sign.
- Add your signature: Upload a photo or a transparent PNG of your actual signature.
- Apply and Download: The tool merges the image onto your document, generating a legally valid, signed PDF file for you to download instantly.
Frequently Asked Questions
Everything you need to know about our online signature tool.
Can I use a photo of my signature?
Yes! Simply write your signature on a blank white piece of paper, take a clear photo of it, and upload it to our tool. It works perfectly.
Is this tool completely free?
Yes, our online PDF signer is 100% free. There are no daily limits, no premium tiers, and no watermarks.
Does this work on mobile phones?
Absolutely. Since the tool runs in the browser, you can easily use it on your iPhone, iPad, or Android device to sign documents on the go.