This is a lightweight wrapper for the CloudConvert API.
http://github.com/cloudconvert/cloudconvert-php
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http://www.office-converter.com/
http://github.com/cloudconvert/cloudconvert-php
similar -
Online Document Converter
PDF Word Excel PowerPoint Flash OpenOffice HTML ODF RTF TXT XML
Online Video Converter
3G2 3GP AVI FLV MKV MOV MP4 RM SWF WMV WebM M1V M2V VCD SVCD DVD Android Blackberry iPad iPhone iPod Nintendo3DS KindleFire PS3 PSP Wii Xbox360 YouTube DV ASF AppleUniversal AppleTV Zune Samsung HTC Motorola Sanyo
Online Audio Converter
AAC AC3 AIFF FLAC M4A MP2 MP3 OGG WAV WMA
Online Image Converter
BMP EMF EPS JPG MET PGM PNG GIF ODD OTG PBM PCT PDF PPM RAS STD SVM PSD TIF SXD ICO TGA TIFF VOR WBMP WEBP XPM
Online Ebook Converter
AZW3 ePub FB2 LRF MOBI PDB TCR
Online Archives Converter
7Z TARBZ2 TARGZ TARZ ZIP
http://www.office-converter.com/