E-Sign Your PDF Online
Draw or upload a signature, place it on any page, and auto-fill detected signature fields — entirely in your browser.
Drop your PDF here or
Upload a single PDF to e-signHow to E-Sign a PDF with IronFreeTools
Upload Your PDF
Drop in the PDF you want to sign. Detected signature fields are listed automatically.
Draw or Upload Signature
Sign with your mouse, stylus, or finger — or upload a PNG/JPG signature image.
Place or Auto-Fill
Click on the page to drop your signature where you want it,
or auto-fill any detected signature fields with one click.Download Signed PDF
Apply all placements and download the signed PDF. Nothing leaves your device.
Go Beyond one-off PDF Signing with IronPDF for C#/.NET
Sign PDFs from your C# and .NET applications with IronPDF: apply certificate-based digital signatures, add visual signature images, or create signature fields for users.
Need e-signing inside your own app? IronPDF lets you digitally sign PDFs with certificates and signature images programmatically in C#/.NET.
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Frequently Asked Questions
Everything you need to know about e-signing PDFs
What does this tool do?
It lets you place a handwritten-style electronic signature onto an existing PDF. Sign with your mouse or upload a signature image, drag it onto any page, and download the signed file.
Can it auto-fill PDF signature fields?
Yes. When you upload a PDF that contains AcroForm signature fields, the tool detects them, lists the field name and page, and offers a one-click way to drop your signature into each field.
How are signature fields detected?
The tool inspects the PDF's AcroForm for fields of type Sig (PDFSignature) and reads each widget's rectangle and page reference, so the signature is placed at the exact location and size the original document expected.
What signature input methods are supported?
Draw a signature directly in the canvas (mouse, touchscreen, or stylus), or upload an existing signature as a PNG or JPG image. Transparent PNGs work best because the page background shows through.
Can I sign multiple pages or place multiple signatures?
Yes. Use the page navigator to switch pages, then click anywhere on the page preview to drop a signature placement. You can add as many placements as you need before downloading.
Can I move or resize a signature after placing it?
Yes. Drag any placement to reposition it, or use the corner handle to resize while keeping the signature's aspect ratio.
Is the signed PDF legally binding?
The output contains a visual electronic signature image, which is widely accepted for most business and personal documents. For documents requiring cryptographic signing, audit trails, or certificate authorities, use a dedicated e-signature platform.
Is my PDF uploaded to a server?
No. PDF parsing, signature rendering, and signed-PDF generation all run locally in your browser using pdf-lib and PDF.js. Nothing you upload or draw leaves your device.
Do I need an account?
No sign-up is required. E-Sign PDF is free to use without an account or installation.
What if my PDF has no signature field defined?
You can still sign it. Just click on the page preview where the signature should go and the tool will place your signature image there. Use the corner handle to resize it as needed.
What are the key benefits?
Draw or upload a signature image Auto-detect AcroForm signature fields One-click auto-sign for detected fields Manual drag-to-place on any page Resize and reposition placements Private, browser-only processing