What is SeekFast for Mac SeekFast is a tool that allows you to quickly and easily search text in files on your computer. It supports all common document file types: Microsoft Word Documents (DOCX) Microsoft Word Documents (DOCX) PDF files (PDF) PDF files (PDF) Microsoft Excel Spreadsheets (XLSX) Microsoft Excel Spreadsheets (XLSX, XLS) Microsoft PowerPoint files (PPTX) Microsoft PowerPoint files (PPTX, PPT) OpenOffice Document Text (ODT) OpenOffice Document Text (ODT) LibreOffice Writer documents (ODT) LibreOffice Writer documents (ODT) LaTeX documents (TEX) LaTeX documents (TEX) Rich Text Format (RTF) Rich Text Format (RTF) Many types of text files (TXT, HTML, XML, PHP, CPP, CS, JAVA, PL, PY, JS) Text files (TXT, HTML, XML, PHP, CPP, CS, JAVA, PL, PY, JS and others)