What is the Nuvenar eSign PDF tool?
Nuvenar eSign PDF is a free, browser-side electronic signature tool. Draw your signature with mouse or touch, place it at any position on any page of a PDF, and download the signed file. It uses the open-source pdf-lib library to embed the signature as a PNG image into the page content. Your PDF and signature never reach a server. No signup, no email, no audit-trail routing.
When to use eSign PDF
- Contracts and NDAs: sign a supplier agreement, freelancer contract, or mutual NDA without DocuSign account creation.
- Expense forms and approvals: sign and return an internal form quickly.
- Letters of authority: sign a letter authorising a third party to act on your behalf.
- HR paperwork: sign offer letters, holiday request forms, or policy acknowledgements.
- Conveyancing and property forms: for documents where an electronic signature is legally accepted by the recipient.
How eSign PDF works
The signature pad is an HTML canvas that records your strokes as a PNG with a transparent background. When you apply, pdf-lib loads the source PDF, embeds the PNG into the chosen page using page.drawImage at the coordinates you clicked, and serialises the result. The placed image is part of the page content stream, so it displays and prints in any PDF viewer.
eSign PDF vs alternatives
DocuSign, Adobe Sign, HelloSign, and PandaDoc are workflow platforms. They give you audit trails, multi-party routing, signer authentication, reminders, and CRM integrations. If you need a defensible audit trail for a high-stakes contract, use one of them. For a fast personal sign, this tool is faster, free, and private.
| Tool | Browser-side | Watermark on free | Free tier limit | Paid price |
|---|---|---|---|---|
| Nuvenar eSign PDF | Yes | Small Nuvenar mark on free | 1 signature per PDF | £9/mo unlimited |
| DocuSign Personal | No | No watermark | Trial only, then paid | £8/mo (5 docs) |
| Adobe Acrobat Online Sign | No | No watermark, limited free | 2 sign uses per month | £12.64/mo + VAT |
| Smallpdf eSign | No | No watermark, capped | 2 tasks per day | €9/mo |
| iLovePDF Sign | No | No watermark | Free with upload | €6/mo |
Privacy and security
Signed PDFs are usually the most sensitive PDFs anyone handles: contracts, NDAs, payroll authorisations, HR documents. Browser-side processing means none of that touches a third-party server. Nothing to disclose in a UK GDPR Record of Processing Activities, no third-party data processor to vet.
Common use cases by profession
- Solicitors: sign engagement letters before sending to a client; pair with the redact PDF tool for client confidentiality.
- Accountants: sign management accounts and engagement scopes.
- Consultants: sign SOWs and NDAs and merge with proposals using the merge PDF tool.
- HR teams: sign offer letters and policy acknowledgements.
- Aesthetics and clinic operators: sign treatment plans and consent forms.
- Property and conveyancing: sign letters of authority and forms where electronic signatures are accepted.
What is included free vs Tools Pro
Free: one signature per PDF, any document, any page, any position, with a small Nuvenar marker on the output. Tools Pro at £9/mo: unlimited signatures per PDF, saved-signature library (up to 3) in browser local storage, no Nuvenar marker, plus access to every other Nuvenar PDF tool (merge, redact, OCR) and 25+ business calculators.
Frequently misunderstood things about eSigning PDFs
- Myth: a drawn signature is not legally binding. Reality: in the UK, electronic signatures are valid for almost all contracts. Specific edge cases (some land transactions, wills) require qualified electronic signatures or wet ink.
- Myth: eSign tools always create an audit trail. Reality: only workflow platforms (DocuSign, Adobe Sign) do. Browser-side signers do not. Match the tool to the legal weight of the document.
- Myth: signed PDFs cannot be edited afterwards. Reality: any PDF can be re-edited unless you also apply a tamper-evident digital certificate. The signature image itself is not protection.
- Myth: drawn signatures are less valid than typed ones. Reality: both are equally valid as evidence of intent under the Electronic Communications Act 2000. Drawn is more visually distinctive.