{"id":5962,"date":"2026-07-14T17:31:13","date_gmt":"2026-07-14T17:31:13","guid":{"rendered":"https:\/\/securitybriefing.net\/tools\/"},"modified":"2026-10-10T09:42:49","modified_gmt":"2026-10-10T09:42:49","slug":"tools","status":"publish","type":"page","link":"https:\/\/securitybriefing.net\/ja\/tools\/","title":{"rendered":"\u7121\u6599\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30c4\u30fc\u30eb"},"content":{"rendered":"<p class=\"wp-block-paragraph\">These are the free security tools we built for readers who want to check something quickly without handing it to a random website. Each one solves a small, concrete job: measuring how strong a password is, creating a stronger one, comparing a file\u2019s digest with a trusted expected digest, and reading an email&#8217;s headers to spot a fake sender. They are free, need no signup, and are meant to be used alongside the guides we publish.<\/p>\n\n\n<div class=\"sb-tools-grid\">\n  <a class=\"sb-tool-card\" href=\"https:\/\/securitybriefing.net\/ja\/%e7%84%a1%e6%96%99%e3%83%91%e3%82%b9%e3%83%af%e3%83%bc%e3%83%89%e5%bc%b7%e5%ba%a6%e3%83%81%e3%82%a7%e3%83%83%e3%82%ab%e3%83%bc\/\">\n    <span class=\"sb-tool-name\">\u30d1\u30b9\u30ef\u30fc\u30c9\u5f37\u5ea6\u30c1\u30a7\u30c3\u30ab\u30fc<\/span>\n    <span class=\"sb-tool-desc\">See how resistant a password really is and what makes it weak, so you can fix it before an attacker finds it.<\/span>\n    <span class=\"sb-tool-go\">Open tool &rarr;<\/span>\n  <\/a>\n  <a class=\"sb-tool-card\" href=\"https:\/\/securitybriefing.net\/ja\/%e7%84%a1%e6%96%99%e3%81%ae%e5%ae%89%e5%85%a8%e3%81%aa%e3%83%91%e3%82%b9%e3%83%af%e3%83%bc%e3%83%89%e7%94%9f%e6%88%90%e3%83%84%e3%83%bc%e3%83%ab\/\">\n    <span class=\"sb-tool-name\">\u30bb\u30ad\u30e5\u30a2\u30d1\u30b9\u30ef\u30fc\u30c9\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u30fc<\/span>\n    <span class=\"sb-tool-desc\">Generate long, random passwords that are hard to guess and easy to store in a password manager.<\/span>\n    <span class=\"sb-tool-go\">Open tool &rarr;<\/span>\n  <\/a>\n  <a class=\"sb-tool-card\" href=\"https:\/\/securitybriefing.net\/ja\/%e7%84%a1%e6%96%99%e3%83%8f%e3%83%83%e3%82%b7%e3%83%a5%e7%94%9f%e6%88%90%e5%99%a8%e6%a4%9c%e8%a8%bc%e5%99%a8\/\">\n    <span class=\"sb-tool-name\">\u30cf\u30c3\u30b7\u30e5\u751f\u6210\uff06\u691c\u8a3c\u30c4\u30fc\u30eb<\/span>\n    <span class=\"sb-tool-desc\">Create and compare hashes with a trusted expected digest. MD5 is for legacy compatibility, not secure integrity decisions.<\/span>\n    <span class=\"sb-tool-go\">Open tool &rarr;<\/span>\n  <\/a>\n  <a class=\"sb-tool-card\" href=\"https:\/\/securitybriefing.net\/ja\/%e7%84%a1%e6%96%99%e3%83%a1%e3%83%bc%e3%83%ab%e3%83%98%e3%83%83%e3%83%80%e3%83%bc%e3%82%a2%e3%83%8a%e3%83%a9%e3%82%a4%e3%82%b6%e3%83%bc\/\">\n    <span class=\"sb-tool-name\">\u30e1\u30fc\u30eb\u30d8\u30c3\u30c0\u30fc\u30a2\u30ca\u30e9\u30a4\u30b6\u30fc<\/span>\n    <span class=\"sb-tool-desc\">Paste a raw email header to trace its path and check for the spoofing and phishing signals we cover in our guides.<\/span>\n    <span class=\"sb-tool-go\">Open tool &rarr;<\/span>\n  <\/a>\n<\/div>\n\n\n<h2 id=\"when-to-reach-for-each-tool\" class=\"wp-block-heading\">When to reach for each tool<\/h2>\n\n<h3 id=\"before-you-reuse-a-password\" class=\"wp-block-heading\">Before you reuse a password<\/h3>\n<p class=\"wp-block-paragraph\">If you are about to reuse a password across accounts, run it through the <a href=\"https:\/\/securitybriefing.net\/ja\/%e7%84%a1%e6%96%99%e3%83%91%e3%82%b9%e3%83%af%e3%83%bc%e3%83%89%e5%bc%b7%e5%ba%a6%e3%83%81%e3%82%a7%e3%83%83%e3%82%ab%e3%83%bc\/\">strength checker<\/a> first. It shows not just a score but why a password is weak: length, predictability, and common patterns. When it flags something, generate a fresh one with the <a href=\"https:\/\/securitybriefing.net\/ja\/%e7%84%a1%e6%96%99%e3%81%ae%e5%ae%89%e5%85%a8%e3%81%aa%e3%83%91%e3%82%b9%e3%83%af%e3%83%bc%e3%83%89%e7%94%9f%e6%88%90%e3%83%84%e3%83%bc%e3%83%ab\/\">generator<\/a> and store it in a password manager rather than trying to remember it. Length matters more than symbols, so favour longer passphrases over short, complicated strings.<\/p>\n\n<h3 id=\"after-you-download-a-file\" class=\"wp-block-heading\">After you download a file<\/h3>\n<p class=\"wp-block-paragraph\">When a vendor publishes a checksum next to a download, use the <a href=\"https:\/\/securitybriefing.net\/ja\/%e7%84%a1%e6%96%99%e3%83%8f%e3%83%83%e3%82%b7%e3%83%a5%e7%94%9f%e6%88%90%e5%99%a8%e6%a4%9c%e8%a8%bc%e5%99%a8\/\">hash generator and verifier<\/a> to compute the hash of the file you received and compare it to the published one. If they match, the file was not altered in transit. If they do not, delete it. Prefer SHA-256 over MD5 whenever the vendor offers it, since MD5 is only useful as a basic integrity check, not as a security guarantee.<\/p>\n\n<h3 id=\"when-an-email-looks-off\" class=\"wp-block-heading\">When an email looks off<\/h3>\n<p class=\"wp-block-paragraph\">If a message claims to be from your bank, employer, or a service you use but something feels wrong, paste its raw headers into the <a href=\"https:\/\/securitybriefing.net\/ja\/%e7%84%a1%e6%96%99%e3%83%a1%e3%83%bc%e3%83%ab%e3%83%98%e3%83%83%e3%83%80%e3%83%bc%e3%82%a2%e3%83%8a%e3%83%a9%e3%82%a4%e3%82%b6%e3%83%bc\/\">email header analyzer<\/a>. It traces the path the message actually took and surfaces authentication results (SPF, DKIM, DMARC) that reveal spoofing. Our guide to <a href=\"https:\/\/securitybriefing.net\/ja\/%e3%83%95%e3%82%a3%e3%83%83%e3%82%b7%e3%83%b3%e3%82%b0\/10-email-header-red-flags-that-reveal-phishing-spoofing-and-bec-attempts\/\">email header red flags<\/a> explains how to read what it shows.<\/p>\n\n<h2 id=\"getting-reliable-results\" class=\"wp-block-heading\">Getting reliable results<\/h2>\n<ul class=\"wp-block-list\">\n<li><strong>Compare, do not trust a single number.<\/strong> A hash only means something when you check it against the value the vendor published on their own site, not against a hash from the same page that hosted the download.<\/li>\n<li><strong>Do not paste real secrets into any online tool.<\/strong> Including ours. When you test a format or a pattern, use example or throwaway values, never a live production password or key.<\/li>\n<li><strong>Treat these as a first check, not a verdict.<\/strong> A clean result is reassuring, but pair it with the fundamentals: official download sources, updated software, and a healthy suspicion of anything that arrives unsolicited.<\/li>\n<\/ul>\n\n<h2 id=\"frequently-asked-questions\" class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n<h3 id=\"are-these-tools-free\" class=\"wp-block-heading\">Are these tools free?<\/h3>\n<p class=\"wp-block-paragraph\">Yes. All of them are free to use and require no account or signup.<\/p>\n\n<h3 id=\"should-i-paste-a-real-password-or-secret-to-test-it\" class=\"wp-block-heading\">Should I paste a real password or secret to test it?<\/h3>\n<p class=\"wp-block-paragraph\">No. As a rule, never paste a live production password, private key, or other real secret into any online tool, including ours. Use example values when you are checking a format or learning how a tool behaves, and rely on a password manager for your real credentials.<\/p>\n\n<h3 id=\"which-hash-should-i-use-md5-or-sha\" class=\"wp-block-heading\">Which hash should I use, MD5 or SHA?<\/h3>\n<p class=\"wp-block-paragraph\">Use SHA-256 when the vendor offers it. MD5 is fine as a quick integrity check to see whether a file changed, but it is not collision-resistant and should not be relied on as a security guarantee.<\/p>\n\n<h3 id=\"do-these-tools-replace-antivirus-or-a-password-manager\" class=\"wp-block-heading\">Do these tools replace antivirus or a password manager?<\/h3>\n<p class=\"wp-block-paragraph\">No. They are quick checks that complement good habits. Keep using reputable, updated security software and a password manager. For more context, read our guide on <a href=\"https:\/\/securitybriefing.net\/ja\/%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af\/what-is-the-network-security-key-wi-fi-security-explained\/\">Wi-Fi\u3068\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ad\u30fc<\/a> and how to <a href=\"https:\/\/securitybriefing.net\/ja\/%e3%82%b5%e3%82%a4%e3%83%90%e3%83%bc%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3\/how-to-tell-if-software-is-real-or-fake\/\">tell if a software is real or fake<\/a>.<\/p>\n<section class=\"sb-related-calculators\" data-no-translation><h2>Time and unit calculators<\/h2><p>For related everyday calculations, use these existing guides and calculators. Results depend on the assumptions explained on each page. Available language versions are labelled below.<\/p><ul><li><a href=\"https:\/\/securitybriefing.net\/it\/dati\/1855-giorni-in-anni\/\">1855 Days In Years<\/a> \u2014 Italian<\/li><li><a href=\"https:\/\/securitybriefing.net\/it\/dati\/quanti-mesi-sono-180-giorni\/\">How Many Months Is 180 Days<\/a> \u2014 Italian<\/li><li><a href=\"https:\/\/securitybriefing.net\/it\/dati\/quanto-sono-900-secondi\/\">How Long Is 900 Seconds<\/a> \u2014 Italian<\/li><li><a href=\"https:\/\/securitybriefing.net\/ar\/\u0628\u064a\u0627\u0646\u0627\u062a\/\u0643\u0645-\u0633\u0646\u0629-\u064a\u0639\u0627\u062f\u0644-700-\u064a\u0648\u0645\/\">How Many Years Is 700 Days<\/a> \u2014 Arabic<\/li><li><a href=\"https:\/\/securitybriefing.net\/ar\/\u0628\u064a\u0627\u0646\u0627\u062a\/\u0643\u0645-\u0645\u062f\u0629-700-\u062b\u0627\u0646\u064a\u0629\/\">How Long is 700 Seconds?<\/a> \u2014 Arabic<\/li><li><a href=\"https:\/\/securitybriefing.net\/ro\/date\/cate-luni-sunt-180-de-zile\/\">How Many Months Is 180 Days<\/a> \u2014 Romanian<\/li><li><a href=\"https:\/\/securitybriefing.net\/ko\/\ub370\uc774\ud130\/700\uc77c\uc740-\uba87-\ub144\uc778\uac00\uc694\/\">How Many Years Is 700 Days<\/a> \u2014 Korean<\/li><li><a href=\"https:\/\/securitybriefing.net\/th\/\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\/700-\u0e27\u0e31\u0e19\u0e40\u0e17\u0e48\u0e32\u0e01\u0e31\u0e1a\u0e01\u0e35\u0e48\u0e1b\u0e35\/\">How Many Years Is 700 Days<\/a> \u2014 Thai<\/li><li><a href=\"https:\/\/securitybriefing.net\/data\/60-months-in-years\/\">60 Months in Years<\/a> \u2014 English<\/li><li><a href=\"https:\/\/securitybriefing.net\/it\/dati\/60-mesi-in-anni\/\">60 Months in Years<\/a> \u2014 Italian<\/li><li><a href=\"https:\/\/securitybriefing.net\/ro\/date\/90-zile-in-luni\/\">90 Days in Months<\/a> \u2014 Romanian<\/li><li><a href=\"https:\/\/securitybriefing.net\/ar\/\u0628\u064a\u0627\u0646\u0627\u062a\/170-\u062f\u0631\u062c\u0629-\u0645\u0626\u0648\u064a\u0629-\u0625\u0644\u0649-\u0641\u0647\u0631\u0646\u0647\u0627\u064a\u062a\/\">170 c to f<\/a> \u2014 Arabic<\/li><li><a href=\"https:\/\/securitybriefing.net\/it\/dati\/quanto-durano-72-ore\/\">How Long is 72 hours<\/a> \u2014 Italian<\/li><li><a href=\"https:\/\/securitybriefing.net\/th\/\u0e02\u0e49\u0e2d\u0e21\u0e39\u0e25\/180-\u0e27\u0e31\u0e19\u0e40\u0e17\u0e48\u0e32\u0e01\u0e31\u0e1a\u0e01\u0e35\u0e48\u0e40\u0e14\u0e37\u0e2d\u0e19\/\">How Many Months Is 180 Days<\/a> \u2014 Thai<\/li><li><a href=\"https:\/\/securitybriefing.net\/vi\/du-lieu\/600-ngay-la-bao-lau\/\">How Long Is 600 Days<\/a> \u2014 Vietnamese<\/li><li><a href=\"https:\/\/securitybriefing.net\/data\/how-long-is-72-hours\/\">How Long is 72 hours<\/a> \u2014 English<\/li><li><a href=\"https:\/\/securitybriefing.net\/vi\/du-lieu\/180-ngay-la-bao-nhieu-thang\/\">How Many Months Is 180 Days<\/a> \u2014 Vietnamese<\/li><li><a href=\"https:\/\/securitybriefing.net\/ar\/\u0628\u064a\u0627\u0646\u0627\u062a\/\u0643\u0645-\u0634\u0647\u0631-180-\u064a\u0648\u0645\/\">How Many Months Is 180 Days<\/a> \u2014 Arabic<\/li><li><a href=\"https:\/\/securitybriefing.net\/data\/how-many-months-is-180-days\/\">How Many Months Is 180 Days<\/a> \u2014 English<\/li><li><a href=\"https:\/\/securitybriefing.net\/ar\/\u0628\u064a\u0627\u0646\u0627\u062a\/3000-\u062f\u0642\u064a\u0642\u0629-\u0625\u0644\u0649-\u0633\u0627\u0639\u0627\u062a\/\">3000 Minutes to Hours<\/a> \u2014 Arabic<\/li><li><a href=\"https:\/\/securitybriefing.net\/ja\/\u30c7\u30fc\u30bf\/600\u65e5\u9593\u306f\u3069\u306e\u304f\u3089\u3044\u304b\/\">How Long Is 600 Days<\/a> \u2014 Japanese<\/li><li><a href=\"https:\/\/securitybriefing.net\/it\/dati\/1-80-m-altezza-in-piedi\/\">1.80 m Height in Feet<\/a> \u2014 Italian<\/li><li><a href=\"https:\/\/securitybriefing.net\/vi\/du-lieu\/60-cm-sang-inch\/\">60 cm to Inches<\/a> \u2014 Vietnamese<\/li><li><a href=\"https:\/\/securitybriefing.net\/ja\/\u30c7\u30fc\u30bf\/700\u65e5\u9593\u306f\u4f55\u5e74\u304b\/\">How Many Years Is 700 Days<\/a> \u2014 Japanese<\/li><li><a href=\"https:\/\/securitybriefing.net\/it\/dati\/quanto-sono-999-secondi\/\">How Long Is 999 Seconds<\/a> \u2014 Italian<\/li><\/ul><\/section>","protected":false},"excerpt":{"rendered":"<p>These are the free security tools we built for readers who want to check something quickly without handing it to a random website. Each one solves a small, concrete job:&hellip; <a class=\"more-link\" href=\"https:\/\/securitybriefing.net\/ja\/tools\/\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"screen-reader-text\">\u7121\u6599\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30c4\u30fc\u30eb<\/span><\/a><\/p>","protected":false},"author":3,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5962","page","type-page","status-publish","hentry","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Free Security Tools: Password, Hash &amp; Email Header Checkers<\/title>\n<meta name=\"description\" content=\"Free security tools from Security Briefing: check password strength, generate secure passwords, create and verify hashes, and analyze email headers for\u2026\" \/>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta 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