Web File Types - File extensions used for web files.
| Extension | File Description | Popularity | |
| .adr | Opera Bookmarks File | Average | |
| .aex | Alpha Five Compiled Global Functions File | Average | |
| .alx | ActiveX Layout Control File | Common | |
| .ap | Active Page | Average | |
| .aro | SteelArrow Web Application File | Average | |
| .asa | ASP Configuration File | Average | |
| .ascx | Active Server Custom Control | Average | |
| .ashx | ASP.NET Web Handler File | Average | |
| .asmx | Active Server Method File | Common | |
| .asp | Active Server Page | Very Common | |
| .aspx | Active Server Page Extended File | Common | |
| .asr | ActionScript Remote Document | Average | |
| .atom | Atom Syndication Format | Average | |
| .att | Web Form Post Data File | Common | |
| .axd | ASP.NET Web Handler File | Common | |
| .bml | Bean Markup Language File | Average | |
| .bok | ProStores Dynamic Web Page | Average | |
| .cdf | Channel Definition Format | Rare | |
| .cer | Internet Security Certificate | Very Common | |
| .cfm | ColdFusion Markup File | Average | |
| .cha | Online Chat Configuration File | Average | |
| .chat | Online Chat Configuration File | Average | |
| .chm | Compiled HTML Help File | Average | |
| .cms | Content Management System | Average | |
| .con | Concept Application Source File | Average | |
| .crt | Security Certificate | Common | |
| .csp | Concept Server Page | Average | |
| .csr | Certificate Signing Request File | Very Common | |
| .css | Cascading Style Sheet | Very Common | |
| .dap | Access Data Access Page | Average | |
| .dbm | ColdFusion Server File | Average | |
| .dcr | Shockwave Media File | Average | |
| .dhtml | Dynamic HTML file | Average | |
| .disco | DISCO Discovery Document | Average | |
| .discomap | DISCO Discovery Output File | Average | |
| .dll | DLL Dynamic Web Page | Average | |
| .dml | DynaScript File | Uncommon | |
| .do | Java Servlet | Average | |
| .download | Partially Downloaded File | Average | |
| .dwt | Dreamweaver Web Page Template | Average | |
| .ece | Escenic Dynamic Web Page | Uncommon | |
| .epibrw | Web File Location | Average | |
| .esproj | Espresso Project File | Average | |
| .fmp | 123 Flash Menu Project | Average | |
| .gne | Flickr Web Page | Average | |
| .gsp | IMail Error Message File | Average | |
| .hdm | HDML File | Rare | |
| .hdml | Handheld Device Markup Language File | Uncommon | |
| .htaccess | Apache HTACCESS File | Average | |
| .htm | Hypertext Markup Language File | Very Common | |
| .html | Hypertext Markup Language File | Very Common | |
| .htx | HTML Extension File | Average | |
| .hxs | Help 2 Compiled Help File | Average | |
| .idc | Internet Database Connector File | Average | |
| .iqy | Internet Query | Uncommon | |
| .jcz | Liquid Motion Animation | Uncommon | |
| .jhtml | Java HTML Web Page | Average | |
| .jnlp | Java Web Start File | Average | |
| .js | JavaScript File | Very Common | |
| .jsp | Java Server Page | Very Common | |
| .jspa | Java Servlet Alias | Uncommon | |
| .jspx | XML Java Server Page | Common | |
| .jvs | JavaScript Proxy Autoconfig File | Average | |
| .jws | Java Web Services File | Average | |
| .lasso | Lasso Database-Driven Web Page | Average | |
| .lbc | Cloaked Affiliate Link Builder Saved Link | Average | |
| .map | Image Map | Uncommon | |
| .master | ASP.NET Master Page | Uncommon | |
| .mht | MHTML Web Archive | Average | |
| .mhtml | MIME HTML File | Average | |
| .moz | Mozilla Cache File | Average | |
| .mspx | Microsoft ASP.NET Web Page | Average | |
| .nxg | eSite Builder NXG Web Page | Uncommon | |
| .nzb | NewzBin Usenet Index File | Average | |
| .ognc | Dynamic Web Page | Average | |
| .oth | OpenDocument HTML Template | Average | |
| .p12 | Personal Information Exchange | Average | |
| .pac | Proxy Auto-Config File | Common | |
| .pem | Privacy Enhanced Mail Certificate | Average | |
| .php | Hypertext Preprocessor File | Very Common | |
| .php3 | PHP 3 Web Page | Uncommon | |
| .php4 | PHP 4 Web Page | Rare | |
| .php5 | PHP 5 Web Page | Rare | |
| .phtm | PHP-Based Web Page | Rare | |
| .phtml | PHP Web Page | Rare | |
| .psp | PL/SQL Server Page | Average | |
| .pub | Public Key File | Average | |
| .qbo | QuickBooks Online Banking Statement File | Common | |
| .qf | Qompose Web Page Template | Average | |
| .qrm | Qworum Message File | Average | |
| .rhtml | Ruby HTML Web Page | Average | |
| .rjs | Ruby Javascript File | Average | |
| .rss | Rich Site Summary | Very Common | |
| .rw3 | RapidWeaver 3 Site File | Uncommon | |
| .rwp | RapidWeaver Package | Average | |
| .rwsw | RapidWeaver Site File | Average | |
| .saveddeck | Nokia Saved Web Page | Average | |
| .sdb | SocialDecks Blog File | Uncommon | |
| .sht | HTML File with Server Side Includes | Uncommon | |
| .shtm | HTML Server Side Include File | Average | |
| .shtml | Server Side Include HTML File | Average | |
| .site | GoLive Website Project File | Average | |
| .srf | Server Response File | Average | |
| .stl | Certificate Trust List | Rare | |
| .stm | SSI Web Page | Uncommon | |
| .stml | SSI HTML File | Rare | |
| .stp | SharePoint Template | Uncommon | |
| .svc | IIS Special Content File | Uncommon | |
| .svr | Compressed Virtual World | Average | |
| .tvpi | TitanTV Television Listing File | Very Common | |
| .tvvi | TitanTV Television Listing File | Very Common | |
| .ucf | WebEx Media File | Common | |
| .url | Internet Shortcut | Average | |
| .vbd | Visual Basic ActiveX Document | Average | |
| .vlp | LiveSite Project | Rare | |
| .vrml | VRML File | Average | |
| .vsdisco | DISCO Dynamic Discovery Document | Average | |
| .wdgt | Opera Widget | Average | |
| .webarchive | Safari Web Archive | Common | |
| .webloc | Mac OS X Website Location | Average | |
| .wgt | Opera Widget File | Common | |
| .whtt | HTTrack Website Copier File | Average | |
| .wml | Wireless Markup Language File | Common | |
| .woa | WebObjects Application | Average | |
| .wpp | Serif WebPlus Project | Average | |
| .wrf | WebEx Recording | Average | |
| .wsdl | Web Services Description Language File | Average | |
| .xfdl | XFDL File | Common | |
| .xht | XHTML File | Average | |
| .xhtml | Extensible Hypertext Markup Language File | Very Common | |
| .xpd | XML Pipeline Document | Average | |
| .xul | XML User Interface Language File | Average | |
| .zfo | XSL-FO Online Form | Average | |
| .zhtml | Secure IE Zipped HTML File | Average | |
| .zul | ZK User Interface File | Average | |
| .zvz | Possible Virus File | Average |
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