Sign PDF
Draw, type or upload your signature to sign documents.
or click to browse — supports PDF files up to 100MB
How to use
- 1 Drop or click to upload your file
- 2 Adjust options if shown
- 3 Click Run Tool
- 4 Download your result instantly
- ✓ Files up to 1GB
- ✓ Unlimited jobs/hour
- ✓ Batch processing
- ✓ Priority support
Files are processed securely and permanently deleted within 1 hour. We never store, read, or share your documents.
Why this works
Draw your signature with mouse, trackpad, or finger — and apply it to your PDF in seconds. No DocuSign account, no email back-and-forth, no third-party landing page.
Most signing jobs don't need a full e-signature platform. You're signing your own document — a contractor agreement, a release form, an internal approval — and you just need a real-looking signature on the page. Stop emailing yourself the PDF, printing it, signing it, scanning it back, and emailing it back. Sign it in your browser instead.
The signature pad is real ink — pressure-sensitive on touch devices, smooth-curve interpolated on mouse and trackpad. You sign once on the canvas above; we composite the signature image onto your PDF at the position you place it. The signature is rasterised at output time so it can't be stripped or moved by a downstream recipient who opens the PDF in a different editor.
What this tool is, and what it isn't: this is a visual signature — a representation of your handwritten mark. For most everyday signing (internal approvals, contractor agreements, NDAs between small parties, school permission slips) that's exactly what's needed and exactly what your counterparty expects. It is not a cryptographic digital signature backed by a certificate authority. If you need a legally-binding e-signature with a tamper-evident certificate chain — typical for high-value commercial contracts or anything that may be litigated — use a dedicated e-signature service like DocuSign, Adobe Sign, or HelloSign, all of which interoperate with PDFs you sign here and there.
We never store your signature. Each session draws a fresh signature pad. If you sign multiple documents in one browser session the signature persists in memory only; refreshing the page or coming back tomorrow starts you fresh.
Files processed on our servers, auto-deleted within one hour. No watermark.
How it works
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1Upload your PDFDrop the PDF you need to sign into the upload box.
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2Draw your signatureSign in the box using your mouse, trackpad, or finger on a touch screen. If the result isn't right, click Clear and try again.
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3Place the signatureDrag the signature image to the right spot on the page — usually a signature line near the bottom. Resize the handles if needed.
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4Save the signed PDFPress Apply, then download the signed PDF. The signature is composited into the page image; it can't be stripped or moved by the recipient.
Real-world uses
Contractors
Signing a new client agreement without leaving the browser tab the contract arrived in.
Parents
School permission slips that arrive as PDFs. Sign and email back without ever printing.
HR teams
New-hire paperwork — offer letters, NDAs, IP assignments — signed digitally by both parties in one session.
Property managers
Routine tenancy paperwork (renewals, addenda) signed in seconds rather than scheduling a wet-ink session.
Common questions
Is this legally binding?
In most everyday US, UK and EU contexts, a visible signature on a PDF is treated as a valid expression of intent to contract — the same standard as a wet-ink signature. For high-value or litigation-prone contracts, use a dedicated e-signature service (DocuSign, Adobe Sign) which adds a tamper-evident certificate chain. PDFRun is the right tool for everyday signing; not the right tool for, say, a multi-million-dollar M&A close.
Can I add my signature on a phone?
Yes. The signature pad is touch-aware: sign with your finger or a stylus directly on your phone or tablet screen. The full workflow works on iOS Safari and Android Chrome.
Will the recipient be able to remove or alter my signature?
No, in any reasonable editor. The signature is rasterised into the PDF page itself, not added as a separate, movable annotation. Removing it would require image-editing of the page content, which leaves visible traces.
Do you store my signature image?
No. Each browser session draws a fresh signature pad. We do not save your signature to any account, profile, or server-side store. Refreshing the page starts you fresh.
Can I sign with an image of my real signature instead?
Yes — use the JPG-to-PDF tool to first turn your signature photo into a PDF page, then use Merge or Overlay to composite it onto the document. The drawing pad is faster for everyday use; the image route is useful when you need an exact match to a wet-ink signature already on file somewhere.
Is there a watermark on the signed PDF?
No. PDFRun doesn't watermark on any plan, including signed documents.