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Sign PDF

Add your electronic signature to PDF documents. Draw, type, or upload your signature and place it directly on the preview.

Drop a PDF file here

or click to browse

Your signature will appear live on the preview and can be dragged anywhere on the page.

Maximum recommended file size: 100MB

Sign PDF Documents Online with Ease

Our free online PDF signature tool makes it simple to sign documents without printing them. Whether you need to sign a contract, an invoice, or an application form, you can securely add your signature directly in your browser. Since everything is processed locally on your device, your sensitive files are never uploaded or stored on our servers, ensuring your privacy remains intact.

What This Tool Does

This client-side tool allows you to electronically sign contracts and fill details in PDF forms directly in your browser. Without requiring any installation or software downloads, you can securely select your documents, apply your desired parameters, and obtain a high-fidelity signed PDF in seconds.

Who Should Use It

Ideal for students compiling homework, legal professionals handling sensitive client files, healthcare administrators matching HIPAA standards, and businesses protecting intellectual property. If you need absolute data confidentiality and cannot risk uploading files to a public cloud, this is your solution.

Supported File Types

  • Input format: Standard PDF files (.pdf)
  • Output format: Clean signed PDF format.
  • Constraint: Fully preserves original vector shapes, metadata structures, and hyperlinks.

Privacy Model

100% Local-First. Your files are never uploaded to our servers. We do not operate external caches, databases, or third-party tracking mechanisms. All data resides in temporary device memory.

Processing Method

Operations are computed inside the browser’s secure sandbox environment. WebAssembly (Wasm) and Javascript modules read and re-compile document byte streams at near-native execution speed.

Browser Compatibility

Fully compatible with Google Chrome, Apple Safari, Mozilla Firefox, Microsoft Edge, and mobile browsers on Windows, macOS, Linux, ChromeOS, iOS, and Android.

Security Standards

Files remain isolated inside the browser tab’s execution threads. We employ symmetric AES-256 standards when handling passwords and encrypting outputs.

Performance limits

Sub-second response times for typical documents. Since memory allocation happens locally, performance scales directly with your device's processor and free RAM.

Common Use Cases

Consolidating research papers, compressing visa documents under consulates’ limits, hiding confidential digits via black box shapes, or e-signing client receipts offline.

How to Sign a PDF

  1. Upload PDF: Drag and drop your PDF file into the upload area or click to select it from your device.
  2. Create Signature: Choose to draw your signature, type your name using a stylized font, or upload an image of your existing signature.
  3. Place Signature: Select the page where you want the signature to appear and drag it to the correct position on the preview.
  4. Download Signed PDF: Click "Sign & Download PDF" to save the signed document to your device.

FAQ

You can sign a PDF online by uploading your document to our tool, choosing to draw, type, or upload an image of your signature, placing it on the desired page, and downloading the signed file.
Yes, our tool processes your PDF entirely within your browser. Your files and signature are not uploaded to any external servers, ensuring maximum privacy and security.
Absolutely. You can upload a PNG or JPG image of your signature and place it anywhere on the PDF document.
Yes! You can draw your signature using a trackpad/mouse, type your name in elegant fonts, or upload a scanned image of your physical signature.
This tool adds electronic signatures (e-signatures), which are legally accepted for most common agreements. For formal deeds, digital cryptographic signatures may be required.
All document processing takes place directly in your browser's local sandbox memory using WebAssembly and WebGL. We employ a local-first privacy model: your PDF files are never uploaded to any remote server or third-party cloud. Your sensitive information never leaves your device.
Yes, absolutely! Once you load the page in your web browser, all transformation algorithms run entirely on your local machine. You can disconnect from the internet (offline mode) and continue performing all PDF tasks safely.
Unlike server-based converters that restrict free accounts to 10MB or 50 pages, our local tools have no hard-coded limitations. The processing speed and maximum file capability depend entirely on your device's processor speed and browser RAM capacity.
No. Our tools are completely free. You don't need to register an account, sign up with an email, or pay for a premium subscription. All features are open and immediately accessible.
Yes, because your documents are never transmitted over the internet or stored on third-party servers, your document workflows are automatically compliant with strict global security and privacy standards, including HIPAA, GDPR, and CCPA.
Yes, our responsive interface is optimized for all modern web browsers on mobile (iOS, Android, iPadOS) and desktop platforms (Windows, macOS, Linux, ChromeOS).
Adobe Acrobat requires a paid desktop subscription and cloud storage sync. Our tool offers a completely free, browser-native alternative. It allows you to transform and edit documents instantly without any software installation, background telemetry, or monthly fees.

Troubleshooting

If processing fails or the page hangs: close other resource-heavy browser tabs to clear RAM, double-check that your document is not secured with an owner lock, or process the file through our Repair PDF utility first to fix underlying index table errors.

Alternatives

Popular alternatives include Adobe Acrobat Pro, Smallpdf, and Sejda. iluvepdf distinguishes itself by running 100% locally in your browser, maintaining full security without subscriptions or upload waiting queues.

Related Tools & Next Steps

Once you have processed your file, we recommend exploring these related tools:
Edit PDFProtect PDFAdd Watermark