How fast is in-browser video conversion?

Conversion speed depends on your computer's CPU. Convertiva uses FFmpeg compiled to WebAssembly with multithreading support, making short clips convert in near real-time.

Is there a watermark added to converted videos?

No. All Convertiva tools are completely free and clean. We never add watermarks, banners, or sponsor overlays to your videos.

Video Converter

Convert MP4 files to MP4 online, free and private. Files are processed in your browser and never uploaded.

Drop your files here

Drag & drop files here, or browse files

mp4 · mov · avi · mkv · webm · wmv · flv · mpeg · mpg · m4v · 3gpMaximum file size: 300 MB

Processed in your browser — never uploaded.

Technical Specifications

Input FormatMP4, WebM, MOV, MKV

Output FormatMP4, WebM, MOV, MKV

Processing EngineFFmpeg (WebAssembly)

Privacy Protection100% In-Browser · Zero cloud queue

Convert videos between MP4, WEBM, MOV and MKV using FFmpeg — the same engine professional tools use — compiled to WebAssembly and running in your browser. No upload, no queue, no watermark.

Make a video playable on an older device or TV
Convert screen recordings for editing software
Produce web-friendly MP4/WEBM from any source

Because processing is local, speed depends on your device — expect roughly real-time or slower for HD video. Very large files are better served by a desktop tool.

How it works

1
Choose or drop your file
2
Adjust options if needed and start processing
3
Download the result — everything stays on your device

Frequently asked questions

How fast is in-browser video conversion?: Conversion speed depends on your computer's CPU. Convertiva uses FFmpeg compiled to WebAssembly with multithreading support, making short clips convert in near real-time.
Is there a watermark added to converted videos?: No. All Convertiva tools are completely free and clean. We never add watermarks, banners, or sponsor overlays to your videos.