PDF Expert 6 supports a number of formats. Below you will find a detailed list of them:
File Viewer
.pages, .keynote, .numbers; .doc/.docx, .xls/.xlsx, .ppt/.pptx, .pps; .odp, .ods, .odt, .rtf, rtfd, .txt; .html, .htm, .webarchive, .log
PDF Viewer
Image Viewer
.bmp, .gif, .ico, .jpg, .jpeg, .png, .tif, .tiff, .xbm, .xbm, .tga, .heif, .heic, .dng
Video Player
.3gp, .l16, .m3u, .m4v, .mm, .mov, .mp4, .scm, .mpv
Audio Player
.aac, .aif, .aifc, .aiff, .amr, .au, .I16, .m3u, .m4a, .m4b, .m4p, .m4r, .mp3, .pcm, .wav
Archiver
.zip, .rar
Note: PDF Expert is intended for annotating PDF files, therefore you need to convert other files to PDF before sending them to PDF Expert. You can use PDF Converter or similar app for iPad to convert your files. All the rest of the presented formats will be available for preview.