Online file conversion tool

I am looking for a online file creation tool with a very basic but responsive design inclusive installation on my webhoster of choice. Coding language of choice (but later I want to maintain it or we do it together), no backend needed, complete website inclusive file conversion is a must. The website must be responsive. The site should be build for multi-language support (adding the translations my own), technically they should be activated by myself when the translation is finish. I just need a little space for my own html code. Supported file types: IMAGE - to JPG - to PNG - to GIF - to BMP - to TIFF DOCUMENT - to PDF - to DOC - to DOCX - to HTML - to CSV AUDIO - to MP3 - to WAV - to AAC - to M4A - to FLAC VIDEO - to MP4 - to MOV - to MKV - to AVI - to FLV EBOOK - to EPUB - to MOBI - to FB2 - to AZW - to CBR ARCHIVE - to ZIP - to CBZ - to RAR - to 7Z - to TAR FONT - to OTF - to TTF - to WOFF - to DFONT - to EOT CAD - to DWG - to DXF - to DWF - to SCAD MESH - to OBJ - to STL - to FBX - to DAE - to GLTF Usability: - the user open the website and see a box where he can drag and drop a file or he can click a button "Choose file" - user uploads a file from local computer to the online formular - the online formular identifies the file type and suggests all possible converting file types in a drop down list - the user chooses the converting file type and clicks "convert" - the user have now two buttons "download" and "restart" for a new file conversion Technical "musts": - the site should be build for multi-language support but the main language should be english (I will care of the translation to other languages but I plan to implement around 25 langauges) - I need some space above and beyond the online formular for my own html If you have any questions please feel free to ask. I got some sample sites, just ask.