Is a scanned signature legally binding? What the scan proves

The first distinction, because almost every short answer online skips it: signing on paper and scanning the page produces a copy of a wet signature; pasting an image of your signature onto a PDF is the signature itself. Those are different legal questions — the first is authentication (does the scan reliably depict the original page?), the second is definition (does the image count as an electronic signature at all?).

Both can be legally binding. Neither proves by itself who placed the picture, which document it was attached to, or whether the file changed after the act. That is mechanical, not a technicality: a scan is a raster image, and nothing inside it binds to bytes, identity or time.

Regulation (EU) No 910/2014 defines an electronic signature as data in electronic form attached to or logically associated with other data, used by the signatory to sign (article 3(10)). A scanned image embedded in a PDF is electronic data attached to the record; an image pasted onto a file with intent to sign satisfies that definition. Article 25(1) then bars denying legal effect or evidentiary admissibility solely because the signature is electronic. No article of the regulation excludes scanned signatures — pages claiming a scan categorically has no legal validity are asserting an exclusion that does not exist.

What eIDAS does not give a scan is a presumption. The handwritten-signature treatment attaches only to qualified electronic signatures (article 25(2)), and a scan is not that tier. The signed paper original keeps its own status; the scan of it is a copy that evidence law weighs as evidence, and the original page — not the copy — remains the stronger exhibit.

The ESIGN Act's definition is not handwriting-specific: an electronic signature is an electronic sound, symbol or process attached to or logically associated with a contract or record and executed or adopted by a person with the intent to sign (15 U.S.C. §7006(5)). A scanned image of a hand signature, placed on a record by the person it belongs to, meets that definition, and §7001(a) bars denying it legal effect solely because it is electronic. State UETA statutes — enacted in 49 states, the District of Columbia, Puerto Rico and the US Virgin Islands — carry the same symbol-and-intent standard.

What the image does not do is authenticate itself. When a scanned signature is challenged, the party relying on it must show the item is what it claims to be — Federal Rule of Evidence 901(a) sets that burden, and it is typically met with evidence around the scan rather than the scan. And the carve-outs stay: wills and particular family-law records remain outside electronic form under state UETA versions, notarization keeps its own rules, so nothing replaces a wet signature where the instrument demands one.

English law states the scan rule rather than leaving it to reports. The Electronic Communications Act 2000, section 7(1), makes an electronic signature — 'so much of anything in electronic form as… purports to be used by the individual creating it to sign', section 7(2)(b) — admissible in evidence on authenticity and integrity questions, together with any certification of it. A scanned image placed on a record with intent to sign satisfies that definition. The Law Commission's 2019 report on electronic execution added the settled view that electronic signatures can execute documents, including deeds, provided the signer authenticates and intends to sign.

The carve-outs still apply: wills, property transfers by deed and powers of attorney keep their own formalities, and no scan substitutes for them. Admissibility also says the picture can be argued with — it says nothing about who wins. The provenance and integrity work is what a UK dispute actually turns on.

'Legally binding' is the floor; disputes are fought over evidence. Four questions dominate: did this person place the image (identity and intent), is this the document they agreed to (nothing in a scan ties the page's bytes to the act), when did it happen (a scan inherits no reliable timestamp), and was it even this signer's image (the copy-paste reuse problem — a lifted signature image looks identical wherever it is pasted). A scanned image answers none of the four.

Those are the same questions a PAdES evidence pack answers mechanically: a digest committed over the exact signed bytes, an identity check recorded in the ceremony, a trusted timestamp from an independent authority, and the audit chain showing each step. The scan sits at the bottom of the evidentiary pile not because the law disfavors it, but because it records a picture instead of a process.

If a workflow must go through paper, add what the scan cannot hold: keep the original document; record who scanned it and from what source; never reuse a signature image captured somewhere else; keep every packet of surrounding evidence together. Where authenticity is plausible to challenge, the original paper beats every digital copy.

And be aware of the hard boundary: a scanned page cannot be upgraded into a cryptographic seal after the fact — the signature act happened on paper, and no post-processing changes that. If the document matters, run the signature in an actual ceremony instead: identity code, digest over the signed bytes, RFC 3161 timestamp and the audit trail, placed in the PDF under the PAdES profile (ETSI EN 319 142-1). That is the evidence layer, stated with its article numbers.