Why E-Sign PDFs in the Browser?
Printing, signing by hand, scanning, and re-emailing is slow and wasteful. A browser-based e-signer turns that workflow into a ten-second task, with the bonus that your sensitive paperwork never leaves your device.
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.
Upload your PDF, draw or upload a signature, drop it onto any page or auto-fill detected signature fields, and download the signed file in seconds.
E-SIGN PDF
Sign Any PDF Online — Draw, Upload, Or Auto-Fill Signature Fields
Need to sign a contract, NDA, or onboarding form right now? IronFreeTools' E-Sign PDF lets you draw or upload a signature and drop it onto any page of your PDF — or auto-fill the signature fields the document already defines — entirely in your browser.
PDF is the universal format for signed agreements. Layouts stay locked, signatures travel intact across email and cloud storage, and every recipient sees the same document, byte for byte.
Common Use Cases
- Sign NDAs, employment contracts, and offer letters remotely
- Counter-sign service agreements without printing
- Initial each page of a multi-page contract in one session
- Sign HR onboarding forms, tax forms, and waivers
- Fill prepared signature fields in legal templates
How It Works
Your PDF is parsed in-browser with pdf-lib to detect AcroForm signature fields, and rendered with PDF.js so you can place signatures visually. Your signature is captured from an HTML5 canvas or upload, then embedded as a transparent PNG at the correct PDF coordinates. Developers automating signing workflows in .NET can use IronPDF's digital signature features for server-side, certificate-backed signatures.
Tips for Best Results
- Upload a transparent PNG signature so the page background shows through
- Use a stylus or trackpad to capture smoother strokes when drawing
- Auto-fill detected fields first, then place any extra signatures manually
- Drag a corner handle to resize a placement without distorting the signature
Frequently Asked Questions
Everything you need to know about e-signing PDFsWhat 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