{"id":2711,"date":"2026-04-01T12:04:46","date_gmt":"2026-04-01T19:04:46","guid":{"rendered":"https:\/\/bartbaggett.com\/blog\/?p=2711"},"modified":"2026-04-01T12:11:12","modified_gmt":"2026-04-01T19:11:12","slug":"can-a-handwriting-expert-compare-two-signatures-and-determine-which-one-is-real","status":"publish","type":"post","link":"https:\/\/bartbaggett.com\/blog\/can-a-handwriting-expert-compare-two-signatures-and-determine-which-one-is-real\/","title":{"rendered":"[Q39] Can a handwriting expert compare two signatures and determine which one is real?"},"content":{"rendered":"<div class=\"flex flex-col text-sm pb-25\">\n<article class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" tabindex=\"-1\" data-turn-id=\"request-WEB:16ebb58d-29b3-43d6-bd17-feef00e85b5a-16\" data-testid=\"conversation-turn-34\" data-scroll-anchor=\"true\" data-turn=\"assistant\">\n<div class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\">\n<div class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\">\n<div class=\"flex max-w-full flex-col gap-4 grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&amp;]:mt-1\" dir=\"auto\" data-message-author-role=\"assistant\" data-message-id=\"f040683c-a7d2-4dbd-aab6-4991372983b9\" data-message-model-slug=\"gpt-5-mini\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden\">\n<div class=\"markdown prose dark:prose-invert w-full wrap-break-word dark markdown-new-styling\">\n<h1 data-start=\"0\" data-end=\"84\"><strong data-start=\"0\" data-end=\"84\" data-is-last-node=\"\" data-is-only-node=\"\">Can a Handwriting Expert Compare Two Signatures and Determine Which One Is Real?<\/strong><\/h1>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<\/div>\n<p><span style=\"font-weight: 400;\">Well, yes and no. That is basically what a forensic handwriting expert does: they examine a signature and determine whether it is authentic or fake. However, the question assumes you have only one comparison signature.<\/span><\/p>\n<p><a href=\"https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/unnamed-23-scaled-1-1-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-3214 size-large\" src=\"https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/unnamed-23-scaled-1-1-1-e1773355919427-1024x558.jpg\" alt=\"\" width=\"1024\" height=\"558\" srcset=\"https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/unnamed-23-scaled-1-1-1-e1773355919427-1024x558.jpg 1024w, https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/unnamed-23-scaled-1-1-1-e1773355919427-300x164.jpg 300w, https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/unnamed-23-scaled-1-1-1-e1773355919427-768x419.jpg 768w, https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/unnamed-23-scaled-1-1-1-e1773355919427.jpg 1440w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Let&#8217;s say the signature appears on a deed, a deed of trust, or a will. In most real courtroom cases, you&#8217;ll have 20 or more comparison documents, including samples taken from a person&#8217;s passport, birth certificate, or driver&#8217;s license. You have all these other comparables so that the expert can establish a range of natural variation.<\/p>\n<h3>Why More Samples Mean a Stronger Opinion<\/h3>\n<p><span style=\"font-weight: 400;\">I&#8217;m not saying it&#8217;s impossible to compare one-to-one. There have been cases where that was enough to form an opinion. However, the better, more scientific approach would be to compare one to many, so you can establish a range of natural variation. <\/span><span style=\"font-weight: 400;\">But if you want to win your case, and if you&#8217;re going to spend $5,000 or $10,000 on an expert witness and another $30,000 on a lawyer, do it right. Find a private investigator. Go dig through trash. Go find other handwriting samples, either in the lawsuit or in the courthouse.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You don&#8217;t have to make your handwriting expert spend hours and hours struggling over three samples of handwriting when you could get 20 of them. In all cases, even though 100 samples sounds like a lot of work, if I have 100 samples, especially 100 original samples, my opinion is going to be stronger. <\/span><span style=\"font-weight: 400;\">I&#8217;m going to be a better witness, and I&#8217;m going to have more confidence that what we&#8217;re telling the jury is authentic. If we have only one or three signatures, it&#8217;s going to be a probability scale. We could end up saying, &#8220;Hey, here&#8217;s the evidence that I can see, but I don&#8217;t know what&#8217;s behind door number three for that file.&#8221; More evidence is always better.\u00a0<\/span><\/p>\n<h3>What About Voter Fraud Cases?<\/h3>\n<p><span style=\"font-weight: 400;\">Voting cases present a particular challenge because examiners often can&#8217;t access large numbers of comparison signatures. <\/span><span style=\"font-weight: 400;\">They can&#8217;t access every voter in the district because it&#8217;s not a will-and-testament case. We actually have people call up and say, &#8220;Hey, we think there&#8217;s voter fraud. There are 24,000 people,&#8221; and then, &#8220;We can&#8217;t afford you.&#8221; I would respond, &#8220;At that scale, cutting corners isn&#8217;t an option if you want reliable results.&#8221;\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, then the caller might say, &#8220;Well, here&#8217;s the voter registration card. Here&#8217;s the signature.&#8221; I mean, that is really not super scientific. I think you probably could work with just two signatures; someone like me could do a first pass. I&#8217;d be pretty accurate with that. <\/span><span style=\"font-weight: 400;\">But it really concerns me that in many places, especially in the United States, people are going untrained, and they&#8217;re kicking out votes because they think the signatures don&#8217;t match. How would they even know if the signature matches?\u00a0<\/span><\/p>\n<p><a href=\"https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/5-used-mb-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-3559\" src=\"https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/5-used-mb-1-1024x547.jpg\" alt=\"\" width=\"1024\" height=\"547\" srcset=\"https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/5-used-mb-1-1024x547.jpg 1024w, https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/5-used-mb-1-300x160.jpg 300w, https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/5-used-mb-1-768x410.jpg 768w, https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/5-used-mb-1-1536x821.jpg 1536w, https:\/\/bartbaggett.com\/blog\/wp-content\/uploads\/2026\/03\/5-used-mb-1.jpg 1823w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Without proper training, there&#8217;s no reliable way to know whether a signature genuinely doesn&#8217;t match or simply reflects natural variation in a person&#8217;s handwriting. So, luckily, I haven&#8217;t heard of too many places in America where the voting was profoundly affected. W<\/span><span style=\"font-weight: 400;\">hen you do see lawsuits about regions and votes, it&#8217;s not like the George Bush thing, which was a tabulation machine issue. The signatures are being thrown out by amateurs, and they really shouldn&#8217;t be given the power to do this, since they have had as little as 1 hour of training.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Even with my training, one comparison signature is enough to say yes, that&#8217;s probably the same person, or maybe not. But I would still prefer another layer of research with enough examples.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, to answer the original question directly: can you compare one signature to another and determine if it&#8217;s fake? Well, the answer is yes, but I&#8217;d rather have a little more evidence.<\/span><\/p>\n<hr \/>\n<p><span style=\"font-weight: 400;\">My name is Bart Baggett. I&#8217;m a forensic handwriting expert. I train people to be forensic handwriting experts. If it&#8217;s a career you&#8217;re interested in, reach out to one of our companies, the <a href=\"https:\/\/go.internationalschool.us\/internationalschool\">International School of Forensic Document Examination<\/a>. <\/span><span style=\"font-weight: 400;\">We have five offices around the country, where experts go to court, testify, and solve million-dollar forgery cases.<\/span><\/p>\n<hr \/>\n<p>&nbsp;<\/p>\n<p><strong>Bart Baggett<\/strong><br \/>\nThe Nation\u2019s Leading Forensic Handwriting Expert<br \/>\nCEO of Handwriting Experts Inc.<br \/>\nForensic Document Examiner \u2022 Expert Witness \u2022 Legal Consultant<br \/>\n\u201cWe solve million-dollar forgery cases.\u201d<\/p>\n<p><strong>Telephone:<\/strong> <a href=\"tel:18009809030\">1-800-980-9030<\/a><\/p>\n<p><a href=\"https:\/\/www.youtube.com\/@thehandwritingexpert\">YouTube: @thehandwritingexpert<\/a><br \/>\n<a href=\"https:\/\/www.linkedin.com\/in\/bartbaggett\/\">LinkedIn: bartbaggett<\/a><br \/>\n<a href=\"https:\/\/www.facebook.com\/bartbaggett\">Facebook: bartbaggett<\/a><br \/>\n<a href=\"https:\/\/www.instagram.com\/forensichandwritingexpert\">https:\/\/www.instagram.com\/forensichandwritingexpert<\/a><br \/>\n<a href=\"https:\/\/www.tiktok.com\/@handwritingexpertsinc\">https:\/\/www.tiktok.com\/@handwritingexpertsinc<\/a><\/p>\n<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<br \/>\nFAQ<br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<\/p>\n<p>Q1: Can a forensic handwriting expert compare just two signatures?<br \/>\nA: Yes, a forensic handwriting expert can compare two signatures<br \/>\nand form an opinion, but it is not ideal. Comparing one signature<br \/>\nagainst many known samples establishes a range of natural<br \/>\nvariation, resulting in a stronger and more defensible conclusion<br \/>\nin court.<\/p>\n<p>&#8212;<\/p>\n<p>Q2: How many signature samples does a handwriting expert need?<br \/>\nA: While one or two samples may be sufficient for a preliminary<br \/>\nopinion, 20 or more comparison samples are preferred. With 100<br \/>\noriginal samples, the expert&#8217;s opinion becomes significantly<br \/>\nstronger and more reliable for court testimony.<\/p>\n<p>&#8212;<\/p>\n<p>Q3: Why is voter signature comparison particularly challenging?<br \/>\nA: Voting cases rarely allow access to large numbers of comparison<br \/>\nsignatures. Without sufficient samples and proper training,<br \/>\nexaminers risk rejecting valid ballots by mistaking natural<br \/>\nvariation in a person&#8217;s handwriting for a mismatch.<\/p>\n<p>&#8212;<\/p>\n<p>Q4: What is a range of natural variation in handwriting analysis?<br \/>\nA: A range of natural variation refers to the normal differences<br \/>\nthat occur in a person&#8217;s own signature over time. Establishing<br \/>\nthis range requires multiple samples and is essential to<br \/>\ndistinguishing a genuine signature from a forgery.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Can a Handwriting Expert Compare Two Signatures and Determine Which One Is Real? Well, yes and no. That is basically what a forensic handwriting expert does: they examine a signature and determine whether it is authentic or fake. However, the question assumes you have only one comparison signature. &nbsp; Let&#8217;s say the signature appears on [&hellip;]<\/p>\n","protected":false},"author":853,"featured_media":3429,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34,40],"tags":[31,52,204,220,225,222,49,219,10],"class_list":["post-2711","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-forensic-document-examination","category-weekly-newsletters","tag-bart-baggett","tag-expert-witness","tag-forensic-document-examination","tag-forensic-document-examiner","tag-forged-document","tag-forged-signature","tag-forgery","tag-forgery-detection","tag-handwriting-expert"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Can a handwriting expert compare two signatures and determine which one is real?<\/title>\n<meta name=\"description\" content=\"Can a handwriting expert compare two signatures and determine which one is real? 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