Do you upload my video?
No. Processing runs locally in your browser.
Add Image to MKV Video
Add image overlays to MKV videos locally and export — no uploads.
Frequently asked questions
Does PNG transparency work?
Yes. PNG alpha is preserved in the overlay.
Is the overlay burned into the video?
Yes. The image is rendered into the output video frames.
Does this affect quality?
Overlays require re-encoding. Quality depends on encoder support and settings.
Which formats are supported?
Common inputs include MP4/WebM/MOV/MKV. Output supports MP4/WebM/MOV/MKV.
Which browsers are supported?
For best results, use the latest Chrome / Edge with WebCodecs support.