About Us

We are a professional software team specialized in developing file converter software, apps and websites for over 20 years. We have run a large converter website for more than 7 years. During this period, we have many unrealistic ideas and experimental new technologies which are not suitable for the old website so we create a new one.

CDKM.com is our next-generation website built with many unrealistic ideas and experimental technologies. The most exciting thing is that we finally manage to put all kinds of file conversions and settings into one single webpage regardless of source/target file formats. Formerly users need to go to the corresponding category to set options and convert files.

Please note CDKM.com removed support for outdated browsers such as Internet Explorer 6-8, Opera 12.1x or Safari 5.1+, so we recommend to use our old website if you are not using a modern browser.


CDKM.com is a unique website with exclusive designs and features. We upgrade CDKM.com on a weekly basis. Some exciting new features are coming soon!

  • Minimalist website design without any redundant items.
  • Mobile-first design to create better experiences on small screen of mobile phone.
  • All file uploads, conversions and downloads can be completed in one single webpage regardless of file formats. No need to switch webpages.
  • CDKM.com takes a number of steps to secure your files. Upload, convert and delete, no files left behind.
  • The website is built with many cutting-edge open-source projects such as LibreOffice, ImageMagick and FFMpeg.
  • Converting files on CDKM.com is as simple as 1-2-3. Choose file, choose output format and click button to start conversion.
  • One-click to pack all output files or delete all output files to protect your privacy.
  • 100% free guaranteed for both personal and commercial uses.

What's New

Latest website upgrades include:

  • You can choose up to 20 (increased from 10) files in batch conversion.
  • One less tap on mobile phone! The main function buttons are shown by default now, formerly these buttons required one tap on the dropdown button to show.
  • Added start/end position option for video and audio conversions.
  • Added support for more file formats such as JXL, VCF or AC3.


We are working on building offline converter (the opposite of online converter) running in web browser. However, this new technology is not supported or not fully supported by many web browsers yet, so it's only an on-going experimental project and not released yet. Please check back later for more information.


We do not provide REST API, account signup and long-term file storage (includes connections to third-party file storage such as Google Drive, Dropbox or OneDrive) because of potential GDPR (General Data Protection Regulation) concern. For detailed information of our privacy policy, visit https://cdkm.com/privacy.html.


If you have any questions about our website, feel free to contact us at support@cdkm.com. You will usually get a response in one business day if it's question about file conversion, other questions may be ignored or responded to in 2 weeks.