{"id":1940,"date":"2026-10-18T15:13:00","date_gmt":"2026-10-18T19:13:00","guid":{"rendered":"https:\/\/www.xconvert.com\/blog\/?p=1940"},"modified":"2026-08-31T23:05:55","modified_gmt":"2026-09-01T03:05:55","slug":"gmail-blocked-file-types","status":"publish","type":"post","link":"https:\/\/www.xconvert.com\/blog\/gmail-blocked-file-types","title":{"rendered":"Gmail Blocked Your Attachment: The File Types Google Won&#8217;t Pass"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">You attach a file, hit send, and Gmail answers with: <em>\u201cThis message was blocked because its content presents a potential security issue.\u201d<\/em> Nothing was too big. Nothing was infected. You were emailing a JavaScript file to a colleague, or an installer to a client, or a disk image to yourself. Gmail publishes the exact list of extensions this happens to \u2014 54 of them \u2014 and the workaround everyone reaches for first is the one Google specifically closed.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Quick answer:<\/strong> Gmail refuses <strong>54 file extensions<\/strong> outright, including <code>.exe<\/code>, <code>.js<\/code>, <code>.mjs<\/code>, <code>.jar<\/code>, <code>.apk<\/code>, <code>.iso<\/code>, <code>.img<\/code>, <code>.dmg<\/code>, <code>.msi<\/code>, <code>.bat<\/code>, <code>.ps1<\/code>, <code>.vbs<\/code> and <code>.dll<\/code>. Crucially, Google\u2019s own help page says the block applies to those types <strong>\u201cwhen found within archives (like .zip or .tgz files)\u201d<\/strong> and to <strong>\u201cpassword-protected archives with archived content\u201d<\/strong> \u2014 so <strong>zipping does not get around it<\/strong>, and neither does putting a password on the zip. (Outlook\u2019s desktop client behaves differently: Microsoft explicitly recommends zipping as a workaround.) The route Google actually recommends is to upload the file to Drive and send a link. ZIP is still the right tool for bundling <em>allowed<\/em> files into one attachment \u2014 just check nothing on the blocked list is hiding in the folder first.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Jump to a section<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#error\">The error, and what triggers it<\/a><\/li><li><a href=\"#list\">All 54 blocked extensions<\/a><\/li><li><a href=\"#zip\">Why zipping works in Outlook and not in Gmail<\/a><\/li><li><a href=\"#fixes\">What actually gets the file through<\/a><\/li><li><a href=\"#tool\">Bundle allowed files into one ZIP on xconvert<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"error\">The error, and what triggers it<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The message is always the same: <strong>\u201cThis message was blocked because its content presents a potential security issue.\u201d<\/strong> <a href=\"https:\/\/support.google.com\/mail\/answer\/6590\">Google\u2019s help page<\/a> lists three things that produce it on a message with an attachment:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Certain types of files<\/strong> \u2014 \u201cincluding their compressed form (like .gz or .bz2 files) or when found within archives (like .zip or .tgz files)\u201d<\/li><li><strong>Documents with malicious macros<\/strong> \u2014 this one is content-based, not extension-based, so a <code>.docm<\/code> or <code>.xlsm<\/code> is not automatically refused; a macro Google\u2019s scanners dislike is<\/li><li><strong>Password-protected archives with archived content<\/strong> \u2014 an encrypted archive that Gmail can\u2019t see inside is treated as a risk in its own right<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Note the first bullet carefully. It isn\u2019t \u201cwe block these filenames.\u201d It is \u201cwe block these <em>types of files<\/em>, including compressed and archived.\u201d That single clause is what makes this different from every other attachment-blocking system, and it\u2019s the sentence that turns \u201cjust zip it\u201d from advice into a waste of ten minutes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is entirely separate from Gmail\u2019s <strong>size<\/strong> limit \u2014 a different rejection with a different message. If your file is legal but too big, <a href=\"https:\/\/www.xconvert.com\/blog\/email-attachment-limits-2026\/\">email attachment limits by provider<\/a> covers that side.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"list\">All 54 blocked extensions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Google publishes the list in full and notes that it \u201coften updates the types of files not allowed to keep up with harmful software that is constantly changing.\u201d As published, grouped by what they actually are:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Category<\/th><th>Extensions<\/th><\/tr><\/thead><tbody><tr><td><strong>Windows executables &amp; installers<\/strong><\/td><td><code>.exe<\/code> <code>.com<\/code> <code>.bat<\/code> <code>.cmd<\/code> <code>.msi<\/code> <code>.msix<\/code> <code>.msixbundle<\/code> <code>.msp<\/code> <code>.mst<\/code> <code>.appx<\/code> <code>.appxbundle<\/code> <code>.scr<\/code> <code>.pif<\/code> <code>.ex<\/code> <code>.ex_<\/code> <code>.cpl<\/code> <code>.msc<\/code> <code>.sys<\/code> <code>.vxd<\/code> <code>.dll<\/code> <code>.lib<\/code> <code>.ins<\/code> <code>.isp<\/code> <code>.shb<\/code> <code>.nsh<\/code><\/td><\/tr><tr><td><strong>Scripts<\/strong><\/td><td><code>.js<\/code> <code>.mjs<\/code> <code>.jse<\/code> <code>.vb<\/code> <code>.vbe<\/code> <code>.vbs<\/code> <code>.ps1<\/code> <code>.wsc<\/code> <code>.wsf<\/code> <code>.wsh<\/code> <code>.sct<\/code> <code>.hta<\/code> <code>.jnlp<\/code><\/td><\/tr><tr><td><strong>Disk images &amp; Windows cabinets<\/strong><\/td><td><code>.iso<\/code> <code>.img<\/code> <code>.vhd<\/code> <code>.dmg<\/code> <code>.cab<\/code> <code>.diagcab<\/code> <code>.diagcfg<\/code> <code>.diagpkg<\/code><\/td><\/tr><tr><td><strong>Java &amp; Android packages<\/strong><\/td><td><code>.jar<\/code> <code>.apk<\/code><\/td><\/tr><tr><td><strong>Access databases, help files, shortcuts, Excel add-ins<\/strong><\/td><td><code>.ade<\/code> <code>.adp<\/code> <code>.mde<\/code> <code>.chm<\/code> <code>.lnk<\/code> <code>.xll<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A few of these catch people out far more often than <code>.exe<\/code> ever does:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong><code>.js<\/code> and <code>.mjs<\/code><\/strong> \u2014 the single biggest source of confusion for developers. Emailing a JavaScript source file to a teammate fails, because Gmail cannot tell a source file from a script that runs on double-click in Windows.<\/li><li><strong><code>.jar<\/code><\/strong> \u2014 Minecraft mods, Java tools, and anything a university course hands out.<\/li><li><strong><code>.iso<\/code> and <code>.img<\/code><\/strong> \u2014 Linux installers, retro-computing images, disc backups.<\/li><li><strong><code>.dmg<\/code><\/strong> \u2014 the ordinary way Mac software ships.<\/li><li><strong><code>.apk<\/code><\/strong> \u2014 an Android build you wanted a tester to install.<\/li><li><strong><code>.dll<\/code><\/strong> \u2014 often not the file you meant to send at all, but sitting inside a project folder you zipped.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"zip\">Why zipping works in Outlook and not in Gmail<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is where the internet\u2019s standard advice comes from, and why it fails. The two big providers made opposite choices, and both wrote theirs down.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Microsoft\u2019s Outlook<\/strong> blocks a long list of extensions too, and its stated reason is the same: <em>\u201cOne of the most common ways of transmitting computer viruses is through file attachments.\u201d<\/em> But <a href=\"https:\/\/support.microsoft.com\/en-us\/office\/blocked-attachments-in-outlook-434752e1-02d3-4e90-9124-8b81e49a8519\">Microsoft\u2019s own help page<\/a> then offers compression as a supported fix, in plain terms: <em>\u201cUsing a compression utility, such as WinZip, creates a compressed archive file that has a different file name extension. Outlook doesn\u2019t recognize these file name extensions as potential threats. Therefore, it doesn\u2019t block the new attachment.\u201d<\/em> Microsoft also suggests renaming the file and having the recipient rename it back.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Gmail<\/strong> closed both doors before anyone documented them as tricks. Its list applies to the blocked types \u201cwhen found within archives,\u201d and password-protected archives are their own separate line item.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"864\" src=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/gmail-vs-outlook-blocking.png\" alt=\"Comparison of how Gmail and Outlook handle blocked attachment types, showing that Gmail also blocks them inside zip archives and password-protected archives while Outlook recommends zipping as a workaround\" class=\"wp-image-1938\" srcset=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/gmail-vs-outlook-blocking.png 1600w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/gmail-vs-outlook-blocking-300x162.png 300w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/gmail-vs-outlook-blocking-1024x553.png 1024w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/gmail-vs-outlook-blocking-768x415.png 768w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/08\/gmail-vs-outlook-blocking-1536x829.png 1536w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Two practical consequences. First, advice you find that says \u201czip it\u201d is very likely written for Outlook and will not help you in Gmail. Second, if you receive a <code>.zip<\/code> from someone on Outlook that contains a blocked type, <strong>Gmail can still reject the message on the way in<\/strong> \u2014 the sender\u2019s client was happy and yours wasn\u2019t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One more thing worth knowing: an organisation\u2019s mail gateway sits on top of all of this, and it can be stricter than the provider default. Microsoft says so directly \u2014 \u201cIf you\u2019re using a Microsoft Exchange account, your email server administrator can unblock certain file types\u201d \u2014 and on the Google side, work and school accounts run under a Workspace administrator who sets the account\u2019s attachment policy. So a file that a personal Gmail account would happily pass can still be stopped at the recipient\u2019s end, and there is nothing you can do about that from your side except ask.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"fixes\">What actually gets the file through<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In rough order of how well they work:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Send a cloud link \u2014 the vendor-recommended route.<\/strong> Google\u2019s own tip on the blocked-files page is: \u201cIf you\u2019re sure the file is safe, you can ask the sender to upload the file to Google Drive. Then send it as a Drive attachment.\u201d Microsoft says the same thing about OneDrive and SharePoint. This works because the file never becomes an email attachment at all; it also sidesteps the size limit at the same time. Any general file-transfer service does the job equally well.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Send the file in a form that isn\u2019t the blocked one.<\/strong> Often you don\u2019t actually need the blocked artefact. A <code>.js<\/code> source file pastes into a message, a code-sharing gist, or a repository. A <code>.dmg<\/code> or <code>.msi<\/code> usually has an official download page you can link. An <code>.apk<\/code> for a tester belongs in a distribution service, not an inbox.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Renaming the extension.<\/strong> Microsoft explicitly recommends this for Outlook \u2014 rename it, send it, have the recipient rename it back. It defeats a filename check, and it is a legitimate thing to do with a file you know is safe. Be aware of two limits. It relies on the recipient knowing to rename it back, and it does nothing against a filter that inspects the file\u2019s contents rather than its name, which is how modern gateway scanning generally works. Treat it as a fallback, not a plan.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>4. What does not work:<\/strong> zipping (Gmail blocks the contents), password-protecting the zip (explicitly listed), double-zipping, renaming the <em>archive<\/em>, or splitting the file across several messages. None of these are clever; they are all things Google\u2019s rules already name.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tool\">Bundle allowed files into one ZIP on xconvert<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ZIP is still exactly the right tool for the job it\u2019s actually good at: turning a pile of <strong>allowed<\/strong> files into one attachment. A folder of 40 photos, a set of PDFs and spreadsheets for a client, a batch of design exports \u2014 one <code>.zip<\/code> instead of forty attachments, with the folder structure intact and text-heavy files meaningfully smaller.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before you build it, do the one check that saves the round trip: <strong>scan the folder for anything on the list above.<\/strong> A single stray <code>.js<\/code>, <code>.dll<\/code> or <code>.exe<\/code> will get the entire message refused, and the error won\u2019t tell you which file caused it.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Open the <a href=\"https:\/\/www.xconvert.com\/archive-file-to-zip\">ZIP archiver<\/a> and click <strong>Upload<\/strong> to add your files, or drag them onto the page. Add as many as you like \u2014 they all go into a single archive.<\/li><li>Everything else is default; there are no compression settings to choose on this page.<\/li><li>Click <strong>Archive<\/strong> to package them, then download the <code>.zip<\/code>.<\/li><li>Attach it as normal. Your recipient opens it with a double-click on Windows, macOS, iOS and Android, or <a href=\"https:\/\/www.xconvert.com\/blog\/unzip-files-online\/\">unzips it online<\/a> on a locked-down machine.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Your files upload over an encrypted connection, are packaged on our servers, and are deleted automatically a few hours later. No account, no watermark.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">FAQ<\/h2>\n\n\n\n<h5 class=\"wp-block-heading\">Why does Gmail block .js files? I\u2019m just sending source code.<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Because Gmail matches on the extension, and on Windows a <code>.js<\/code> file is executed by Windows Script Host when double-clicked \u2014 the same mechanism a script-based malware dropper uses. Gmail can\u2019t distinguish your React component from that, so both are refused. <code>.mjs<\/code> is on the list for the same reason. The practical answer for source code is to put it somewhere designed for code: a repository, a gist, or a shared drive, and email the link.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Can I zip an .exe to get it past Gmail?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">No. Google\u2019s help page states the block applies to these file types \u201cwhen found within archives (like .zip or .tgz files)\u201d and to their \u201ccompressed form (like .gz or .bz2 files).\u201d Gmail looks inside. This is the single most common piece of outdated advice on the topic, and it usually originates from Microsoft\u2019s Outlook documentation, which genuinely does recommend zipping \u2014 for Outlook.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Will password-protecting the ZIP work?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">No, and it makes things worse. \u201cPassword-protected archives with archived content\u201d is its own entry in Google\u2019s list of what Gmail won\u2019t let you attach. An encrypted archive is refused precisely <em>because<\/em> the scanner cannot see inside it, so adding a password turns a maybe into a definite no.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">My ZIP was blocked and nothing in it looks dangerous. What happened?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Something in the archive matches the list, and the error message won\u2019t tell you what. Usual suspects are files you didn\u2019t think about: a <code>.dll<\/code> or <code>.exe<\/code> inside a project\u2019s build folder, a <code>.js<\/code> bundled with an exported web page or email template, a <code>.lnk<\/code> Windows shortcut that got dragged in with a folder, or a <code>.jar<\/code> in a Java project. Unpack the archive, sort by extension, and check it against the list above before rebuilding it.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Does the block apply to email I receive, not just email I send?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Google\u2019s page is written from the sender\u2019s side \u2014 \u201cGmail doesn\u2019t allow you to attach\u201d \u2014 but the same \u201cpotential security issue\u201d error appears on inbound messages, which is why a colleague on a different provider can send you something that never arrives. If you\u2019re expecting a file and it doesn\u2019t show up, this is worth ruling out before blaming spam filtering.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Is this the same thing as Gmail\u2019s 25 MB attachment limit?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">No \u2014 they are two independent rejections with different messages. The size limit is about <em>how big<\/em> the file is (Google states 25 MB for personal Gmail accounts, with work and school accounts set by their Workspace administrator); this is about <em>what type<\/em> it is. A 2 KB <code>.bat<\/code> file is refused, and a 24 MB video sails through. If your problem is size rather than type, the fix is compression or a link, covered in <a href=\"https:\/\/www.xconvert.com\/blog\/email-attachment-limits-2026\/\">email attachment limits by provider<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Last verified 2026-08-31.<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/support.google.com\/mail\/answer\/6590\">File types blocked in Gmail \u2014 Google Gmail Help<\/a> \u2014 the full 54-extension list quoted above; the error text \u201cThis message was blocked because its content presents a potential security issue\u201d; the statements that the block applies to compressed forms and files \u201cfound within archives (like .zip or .tgz files)\u201d, to \u201cdocuments with malicious macros\u201d, and to \u201cpassword-protected archives with archived content\u201d; and the Google Drive workaround.<\/li><li><a href=\"https:\/\/support.microsoft.com\/en-us\/office\/blocked-attachments-in-outlook-434752e1-02d3-4e90-9124-8b81e49a8519\">Blocked attachments in Outlook \u2014 Microsoft Support<\/a> \u2014 \u201cOne of the most common ways of transmitting computer viruses is through file attachments\u201d; the compression workaround, verbatim: \u201cOutlook doesn\u2019t recognize these file name extensions as potential threats. Therefore, it doesn\u2019t block the new attachment\u201d; the rename workaround; and \u201cIf you\u2019re using a Microsoft Exchange account, your email server administrator can unblock certain file types.\u201d<\/li><li><a href=\"https:\/\/support.google.com\/mail\/answer\/6584\">Send attachments with your Gmail message \u2014 Google Gmail Help<\/a> \u2014 the separate <em>size<\/em> limit: \u201cFor personal Gmail accounts, the limit is 25 MB. For work and school accounts, your Google Workspace administrator sets the attachment sending limits and attachment receiving limits.\u201d<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Gmail blocks certain file types outright \u2014 and zipping or password-protecting them doesn&#8217;t help. Here&#8217;s the list, and what actually works.<\/p>\n","protected":false},"author":4,"featured_media":1937,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,14],"tags":[],"class_list":["post-1940","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to-guides","category-tools"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gmail Blocked Your Attachment: The File Types Google Won&#039;t Pass<\/title>\n<meta name=\"description\" content=\"Gmail blocks certain file types outright \u2014 and zipping or password-protecting them doesn&#039;t help. 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