--- title: Data source description: Connect a website, R2 bucket, or upload files directly to your AI Search instance for indexing. image: https://developers.cloudflare.com/dev-products-preview.png --- > Documentation Index > Fetch the complete documentation index at: https://developers.cloudflare.com/ai-search/llms.txt > Use this file to discover all available pages before exploring further. [Skip to content](#%5Ftop) # Data source You can upload files directly to an instance or connect an external data source. | Data Source | Description | | ----------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------- | | [Built-in storage](https://developers.cloudflare.com/ai-search/configuration/data-source/built-in-storage/) | Upload files directly to an instance. Available by default on every new instance. | | [Website](https://developers.cloudflare.com/ai-search/configuration/data-source/website/) | Connect a domain you own to index website pages. | | [R2 Bucket](https://developers.cloudflare.com/ai-search/configuration/data-source/r2/) | Connect a Cloudflare R2 bucket to index stored documents. | ## Supported file types AI Search can ingest a variety of file types. The following plain text files and rich format files are supported. ### Plain text file types | Format | File extensions | Mime Type | | ---------- | ---------------------------------------------------------------- | -------------------------------------------------------------- | | Text | .txt, .rst | text/plain | | Log | .log | text/plain | | Config | .ini, .conf, .env, .properties, .gitignore, .editorconfig, .toml | text/plain, text/toml | | Markdown | .markdown, .md, .mdx | text/markdown | | LaTeX | .tex, .latex | application/x-tex, application/x-latex | | Script | .sh, .bat, .ps1 | application/x-sh, application/x-msdos-batch, text/x-powershell | | SGML | .sgml | text/sgml | | JSON | .json | application/json | | YAML | .yaml, .yml | application/x-yaml | | CSS | .css | text/css | | JavaScript | .js | application/javascript | | PHP | .php | application/x-httpd-php | | Python | .py | text/x-python | | Ruby | .rb | text/x-ruby | | Java | .java | text/x-java-source | | C | .c | text/x-c | | C++ | .cpp, .cxx | text/x-c++ | | C Header | .h, .hpp | text/x-c-header | | Go | .go | text/x-go | | Rust | .rs | text/rust | | Swift | .swift | text/swift | | Dart | .dart | text/dart | | EMACS Lisp | .el | application/x-elisp, text/x-elisp, text/x-emacs-lisp | ### Rich format file types AI Search uses [Markdown Conversion](https://developers.cloudflare.com/workers-ai/features/markdown-conversion/) to convert rich format files to markdown. The following table lists the supported formats that will be converted to Markdown: | Format | File extensions | Mime Types | | PDF Documents | .pdf | application/pdf | | -------------------------- | ------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------- | ---- | --------------- | | Images 1 | .jpeg, .jpg, .png, .webp, .svg | image/jpeg, image/png, image/webp, image/svg+xml | | | | | HTML Documents | .html, .htm | text/html | | | | | XML Documents | .xml | application/xml | | | | | Microsoft Office Documents | .xlsx, .xlsm, .xlsb, .xls, .et, .docx | application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application/vnd.ms-excel.sheet.macroenabled.12,application/vnd.ms-excel.sheet.binary.macroenabled.12,application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.wordprocessingml.document | | | | | Open Document Format | .ods, .odt | application/vnd.oasis.opendocument.spreadsheet,application/vnd.oasis.opendocument.text | | | | | CSV | .csv | text/csv | | | | | Apple Documents | .numbers | application/vnd.apple.numbers | | | | 1 Image conversion uses two Workers AI models for object detection and summarization. See [Workers AI pricing](https://developers.cloudflare.com/workers-ai/features/markdown-conversion/#pricing) for more details. ## File limits AI Search has a file size limit of **up to 4 MB**. Files that exceed this limit will not be indexed and will show up in the error logs. ```json {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/ai-search/","name":"AI Search"}},{"@type":"ListItem","position":3,"item":{"@id":"/ai-search/configuration/","name":"Configuration"}},{"@type":"ListItem","position":4,"item":{"@id":"/ai-search/configuration/data-source/","name":"Data source"}}]} ```