How to Sign a PDF Online for Free — No Adobe Acrobat Needed

Open the iFormat PDF Signer and upload the document that needs signing. You get three options for creating your signature:

• Draw it. Use your mouse, trackpad, or finger (on a touchscreen) to draw your signature freehand. This produces the most natural, handwritten-looking result and is the most widely accepted method for contracts, agreements, and official documents. Take your time with the drawing — a rushed mouse signature looks like a rushed mouse signature. On a touchscreen (phone or tablet), use your finger or a stylus for a smoother result.
• Type it. Type your name and the tool generates a signature-style rendering using script typography. Quick and clean for informal documents like internal approvals, expense reports, and memos, but it does not look handwritten and some recipients may not consider it sufficiently "signed" for formal contracts.
• Upload an image. If you have previously signed a blank piece of white paper, photographed it with your phone, and saved the image, you can upload that photograph. The tool automatically removes the white background so only the signature ink appears on the document. This is useful if you have a particularly distinctive signature that is difficult to replicate with a mouse.

Once you have your signature, click where you want it placed on the PDF, drag to resize it to fit the signature line, and download the signed document. The signature is flattened into the PDF content — it is not a removable annotation or a floating layer.

In most jurisdictions around the world, yes. The legal frameworks are well-established:

• United States: The ESIGN Act (Electronic Signatures in Global and National Commerce Act, 2000) and UETA (Uniform Electronic Transactions Act) give electronic signatures the same legal standing as handwritten ones for contracts and commerce.
• European Union: The eIDAS Regulation (EU 910/2014) recognises electronic signatures across all EU member states.
• United Kingdom: The Electronic Communications Act 2000 and the Electronic Identification and Trust Services for Electronic Transactions Regulations 2016 provide legal recognition.
• India: The Information Technology Act 2000 recognises electronic signatures for most purposes.

The exceptions are narrow and jurisdiction-specific: wills, certain real estate transfers (particularly deeds and mortgages in some US states), court orders, and a few specific categories of government filings may still require wet ink. For everyday contracts, NDAs, employment agreements, invoices, consent forms, and business correspondence, an electronic signature is fully valid and legally binding.

What matters legally is not the method of signing but the intent. The signer must intend to sign, and there must be evidence of who signed. An email trail showing you received the document, signed it, and returned it establishes both intent and identity.

Many contracts and legal agreements require your initials on every page and a full signature on the last page. Some also need a date written next to each signature. The PDF signer lets you place multiple signatures and initials anywhere in the document across any number of pages. Create your signature once, then click to place copies on each page that needs them. Create a separate initial version (just your initials drawn smaller) and place those where needed. You do not have to redraw your signature each time.

For dates, use the PDF form filler to type the date next to each signature. You can sign the document first and then add dates in a separate pass, or use both tools on the same document.

Once the document is signed, you typically need to do one of these things:

• Email it back. If the signed file is large (scanned contracts often are), compress it under 1 MB before attaching it to the email. Most corporate email servers reject attachments over 5-10 MB.
• Upload to a portal. Many submission portals have strict file size limits. Check the limit before uploading and compress if needed.
• Merge with supporting documents. If you are submitting a signed contract along with appendices, exhibits, or supporting materials, merge everything into one PDF for a cleaner submission.
• Archive it. Keep both the unsigned original and the signed version. The unsigned original is your reference copy; the signed version is the executed document.

A few small things make the difference between a signature that looks deliberate and professional and one that looks like it was scrawled with a broken mouse:

Slow down when drawing. The most common mistake with mouse-drawn signatures is rushing. Move the mouse slowly and deliberately. A smooth, controlled signature looks far more professional than a fast, jagged one. If your hand is unsteady with a mouse, try using your phone instead — finger-drawn signatures on a touchscreen almost always look better.

Use a dark colour. Black or dark blue are the standard colours for signatures. The tool defaults to black, which is the safe choice for any document. Some legal traditions prefer blue ink (to distinguish an original from a photocopy), but for electronic signatures this distinction does not apply.

Size the signature to fit the line. A signature that overflows the signature area looks careless. Resize it to fit within the designated space. Most contracts have a clear signature line — your signature should sit on that line without overlapping the text above or below it.

Drawing a signature with your finger on a phone touchscreen actually produces a more natural-looking result than drawing with a mouse on a desktop. The finger movement mimics actual pen motion more closely. Open the signer in Safari or Chrome on your phone, upload the PDF (from Files, Downloads, or an email attachment), draw your signature with your finger, and place it on the document. The whole process takes under a minute.

Apple's built-in Markup tool (available in Files, Mail, and Notes) can also add signatures to PDFs, but it has a significant limitation: Markup draws on the visible rendering layer rather than embedding the signature into the PDF structure. The result is a Markup annotation, not permanent PDF content. Some recipients, PDF viewers, and submission portals may not recognise or display it correctly. The online signer embeds the signature permanently as part of the PDF content stream, ensuring universal compatibility.

Can I reuse my signature on future documents?
The tool saves your last-drawn signature in your browser session so you can reuse it across multiple documents without redrawing. For long-term reuse, save the signature image file and use the Upload option each time — this gives you a consistent signature across all documents.

Is the signed PDF tamper-proof?
An electronic signature does not prevent someone from editing the PDF afterward. For tamper-proof documents, you need a digital (cryptographic) signature, which is a different mechanism typically provided by services like DocuSign, Adobe Sign, or government-issued digital certificates. The electronic signature proves intent to sign; the audit trail (email records showing who sent and received the document) provides the evidence chain.

Can I remove a signature after adding it?
Once you download the signed PDF, the signature is permanently embedded in the document. It cannot be selectively removed without re-creating the document. If you placed the signature in the wrong position or on the wrong page, re-upload the unsigned original and sign again.

Can multiple people sign the same document?
Yes. The first person signs and downloads the result. The second person uploads that already-signed PDF and adds their own signature. Each signature is embedded in sequence without affecting previous signatures. This works for any number of signatories.

Does signing increase the file size?
Minimally. A drawn signature adds roughly 5-20 KB to the file depending on its complexity. A typed signature adds even less. For a multi-megabyte PDF, the increase is negligible.