Sign a PDF online

Signing a PDF online sits in a quietly enormous category of small daily tasks that used to require a printer, a scanner, and a fifteen-minute round-trip through the office hardware that nobody fully maintains. The print-sign-scan ritual is one of those legacies that survived the transition to remote work mostly because nobody paused to question whether it was still needed; the answer for the vast majority of cases is that a placed-image signature on a PDF satisfies the actual business requirement just fine, and the printer ritual was always more about habit than about the legal value of physical ink on paper. This tool is designed for that everyday case — a contract amendment, an internal approval, a routine NDA, a freelance invoice — where what you really need is a visible signature on the file, not a complex cryptographic apparatus around it.

There's an important distinction worth making upfront between visible signatures and certificate-backed digital signatures. A visible signature is a graphical mark — a drawn squiggle, a typed name in a stylised font, an uploaded image of an inked signature scanned long ago — placed on top of the document at a specific location. Legally, this is equivalent to a wet signature in most jurisdictions for ordinary commercial contracts, employment agreements, and routine business documents; it carries the same evidentiary weight as a paper signature and the same vulnerabilities (anyone can copy and paste it, just as anyone can trace or photocopy a paper signature). A certificate-backed digital signature, by contrast, uses cryptographic keys to bind a particular signing event to a particular signer in a way that's mathematically verifiable. This tool produces visible signatures; for cases that genuinely require certificate-backed signing (real estate transactions in some jurisdictions, certain government filings, regulated financial agreements), a different tool is the right choice.

The three input methods cover different ergonomic situations. Drawing your signature with a mouse or trackpad works fine on a desktop and is the right choice when you don't have a pre-made image and don't want to install anything; the result looks a bit shakier than a real signature because mouse pointers don't naturally reproduce pen pressure, but for routine documents that's not a problem. Uploading a transparent PNG is the highest-fidelity option for people who've already photographed or scanned a real ink signature on paper — drawn it with a black pen on a white page, scanned it, removed the white background in any image editor, and saved as a PNG with alpha. The typed-and-styled option is the fastest for people who don't care about visual authenticity and just need to indicate intent — a cursive typeface on the typed name communicates 'this person agrees' without pretending to be an actual signature.

Placement matters more than people initially realise. A signature placed badly — overlapping the printed text below the signature line, drifting too far above or below the line, hanging off the edge of a form field — can make the whole document look unprofessional even when everything else is in order. The interactive placement preview shows the signature on the real page in real-time so you can drag it into precisely the right spot before committing. The same care applies to size: a signature that's too large dominates the page; one that's too small looks tentative; the right size feels balanced with the printed signature line and matches the visual weight of typed text on the same page. Getting placement right takes ten seconds and saves the awkward back-and-forth of a counterparty asking for a redo.

Multi-page documents and multi-signature documents add complexity that's worth handling cleanly. Many contracts have signature blocks on the last page only, but plenty of others ask for initials on every page (typical for term sheets, NDAs with multiple sections, and any contract over a few pages where each page is meant to be individually attested). The tool supports placing signatures and initials at any position on any page, which means a five-page contract with initials on pages 1 through 4 and a full signature on page 5 can be completed in a single session rather than across multiple uploads. For multi-party signing, the typical pattern is sign-and-pass: sign your portion, save, send to the next party, who signs their portion on top of the existing signed document.

The legal status of placed-image signatures is worth being concrete about because it varies by jurisdiction in details but is consistent in the basics. In the United States, the ESIGN Act and most state UETA implementations treat electronic signatures (including placed images) as legally equivalent to wet signatures for almost all commercial purposes. In the European Union, the eIDAS regulation establishes a hierarchy: simple electronic signatures (placed images included) are valid for most transactions, advanced electronic signatures provide stronger evidentiary value, and qualified electronic signatures have the highest legal weight. The UK, Canada, Australia, and most of Asia operate under similar tiered systems. For the kinds of documents people sign with this tool — routine business agreements, internal approvals, freelancer engagements — simple electronic signatures are explicitly recognised and valid, no upgrade required.

Common workflows that this tool handles well include freelance contracts (the freelancer signs and returns to the client), expense approvals (the approver signs and returns to finance), routine NDAs (both parties sign in turn), order acknowledgments (the buyer signs and returns to the seller), employment offer letters (the candidate signs and returns to HR), and minor amendments to existing contracts (one party signs and circulates). The pattern in all of these is the same: a PDF arrives, a signature is needed, the signed PDF goes back. The tool collapses that into a few clicks and removes the print-sign-scan loop entirely. For documents where the receiver might re-edit the file before re-sending, locking the PDF after signing is a sensible additional step, but for most ordinary cases it's overkill.

There's a workflow optimisation worth picking up if you sign things regularly. Saving your signature once, in PNG with transparency at a comfortable size and resolution, means every subsequent signing is a one-click upload rather than a fresh draw or styled type. Keep the file in a private folder on whichever cloud you trust, name it something obvious, and reach for it whenever a signature is needed. The PNG is roughly the digital equivalent of a wet-ink stamp — same convenience, same security implications. If the file leaks, anyone who has it can paste it onto any PDF, which is the same vulnerability that a stolen ink-pen-on-paper signature has but slightly easier to reproduce. Treat the file accordingly.

Comparison with full e-signature platforms (DocuSign, Adobe Sign, HelloSign) is worth a quick note. Those services do additional things this tool doesn't — sequential routing to multiple signers, audit trails recording who signed when from what IP address, certificate-backed signing for cases that need it, integration with CRMs and contract management systems. For an organisation with high signing volume across many contracts, those features are valuable. For an individual or small team signing a handful of documents per month, the additional capability isn't worth the per-document fees those platforms charge. The fork in the workflow is essentially economic: low volume favours this tool, high volume justifies a managed platform.

Operationally the tool takes a single drop. Upload the PDF, choose how to provide your signature (draw, upload, type), place it on the page at the position and size you want, repeat for any additional signatures or initials, download the signed PDF. Files are processed in temporary storage, links expire quickly, no signup, no watermark, no per-day quota. Multiple PDFs can run through one after another, useful when finishing a backlog of pending signature requests rather than a single one-off document. Most files process in a few seconds; very large multi-hundred-page documents take proportionally longer but still complete in a single pass without intermediate steps.