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Sign a PDF

Draw, type or upload your signature, click it onto the page, download — the contract and your signature never touch a server.

One PDF · signed on your device — the document and your signature never upload

Runs in your browser. Files are never uploaded — you can go offline after the page loads.

How to use the Sign PDF

  1. Drop the PDF and add your signature — draw it, type it in script, or upload one you already have.
  2. Click the page where the signature belongs; drag to fine-tune, slide to size. Repeat anywhere.
  3. Download the signed PDF — stamped exactly as you placed it.

Easy to use

Drop files, pick options, download. Whole folders at once, no signup, no daily limit.

Best quality

The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.

Private & secure

Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.

The one document that should never be uploaded

Signing services store the two most sensitive things you have: the contract and your handwritten signature — and the free tiers come with accounts, emails to "counterparties", and documents retained on their servers. Here the whole ceremony happens in your browser: the page renders locally, your signature is drawn locally, the stamp is applied by pdf-lib locally, and the signed file lands straight in your downloads. No account, no counterparty emails, no copy kept anywhere.

Honest words about validity

An image signature placed with intent is a legally accepted electronic signature for everyday agreements in most of the world (ESIGN/UETA, eIDAS "simple" signatures, India's IT Act). What it is not: a certificate-based digital signature that cryptographically proves identity — some government filings and regulated industries require those from a certificate authority. For the offer letters, rent agreements, invoices and consent forms of normal life, this is the standard practice. Pair it with a watermark or page numbers, and merge the annexures — all without the document leaving your device.

Frequently asked questions

Can I use a signature I already have?

Yes. Click “Upload a signature image” and pick a transparent PNG, or a photo or scan of your signature on paper — the tool removes the white background automatically so only the ink is stamped onto the page. A signature made in our Signature Maker drops straight in this way too.

Is this legally valid?

For most everyday agreements, yes — most jurisdictions (ESIGN/UETA in the US, eIDAS “simple electronic signature” in the EU, the IT Act in India) accept an image signature the parties intend as a signature. It is not a certificate-based digital signature with cryptographic identity proof; regulated filings that demand one need a certificate provider. For the rental agreement, invoice, consent form or offer letter — this is exactly the accepted practice.

Why does no-upload matter extra here?

Because the two things this tool touches — a contract and your handwritten signature — are the two things you least want stored on someone’s server. Everything here happens in your browser: draw, place, stamp, download. Nothing transmits, nothing is retained.

Can I sign in multiple places?

Yes — place your signature (or initials — just make a second, smaller signature) as many times as needed, on any pages; every placement is stamped in one pass.

Your files never leave your device

Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.

  • No upload, ever. Turn off Wi-Fi after the page loads and every tool keeps working.
  • No limits. No file-size cap, no queue, no watermark, no account.
  • Runs on your CPU. Batches use several cores in parallel; nothing is throttled.

More free tools

Need icons or SVGs to start from?

InfyTool is built by the same team as these free libraries.