Video Converter
Convert common local video files to MP4 or WebM in the browser. Your files are never uploaded to our servers. ToolkitPoint processes them on your own computer, so confidential documents stay with you.
Processed in your browser. Your files are not uploaded.
How to use Video Converter
- Choose one or more videos; each file is analysed and shown with its codecs, size, length and the plan for the chosen output.
- Pick a Preset (Universal MP4, Apple, Web WebM, Keep everything MKV, Editing MOV) or set the container, mode and video codec yourself. "Smart" copies the streams the container can hold and re-encodes only what cannot fit. If the file is already in the chosen format, the tool clearly notes that streams are copied without conversion.
- Optionally limit the resolution (never enlarged), change the frame rate, set CRF quality or a video bitrate, and choose the audio codec and bitrate or remove the audio.
- Read the plan and the compatibility notes for each file, then press "Convert". Files run one after another with progress and a cancel button.
- Download each result, or all as one ZIP. Each result lists the codecs actually written and warns if its length differs from the source.
Worked example
Load movie.mkv (H.264 video, FLAC audio) and choose "Universal: MP4, H.264 + AAC". The panel says the video will be copied and the audio re-encoded to AAC because FLAC cannot be stored in MP4. After Convert, movie.mp4 lists "H264 + AAC, video copied, audio re-encoded" and the note that it plays on iPhone, Android, Windows and in every current browser.
When to use this tool
- Changing an MKV to MP4 for a phone or TV without re-encoding the picture.
- Making a WebM (VP8 + Opus) version of a clip for a web page.
- Converting a folder of clips to MP4 in one batch and downloading a ZIP.
- Checking whether a video will play on an iPhone before sending it.
Important limitations
Only the streams that must change are re-encoded, but re-encoding in the browser (WebAssembly) is slow, WebM especially, and files over 250 MB are rejected. Subtitle tracks are kept only for MKV output. Playback guidance is general knowledge about codecs and containers, not a test on your device.
Frequently asked questions
Will converting MKV to MP4 lose quality?
Not when the codecs fit. If the MKV holds H.264 or HEVC video and AAC, MP3 or AC-3 audio, they are copied into MP4 without re-encoding, which takes seconds and keeps every pixel. Anything MP4 cannot hold (VP9 video, FLAC or Opus audio) is re-encoded, and only that part.
How do I know what will be copied and what re-encoded?
Each file shows a plan such as "Video: copied without re-encoding. Audio: re-encoded to AAC", with the reason. Changing resolution or frame rate forces the video to be re-encoded.
Why is WebM slow, and why VP8?
Re-encoding to WebM is slower than H.264 because the browser engine has no hardware help. It uses VP8 with Opus audio, which plays in all current browsers; VP9 encoding is not offered because it is unreliable in this in-browser engine. Existing VP8/VP9/AV1 video is still copied untouched into WebM or MKV. After your first conversion the tool shows an estimate based on your own device.
Are subtitle tracks kept?
Only when the output is MKV. MP4, MOV and WebM outputs drop subtitle tracks and the tool says so per file.
Is the compatibility advice a test?
No. It is general guidance about which codecs and containers iPhones, Windows, Android and browsers usually play. H.264 with AAC in MP4 is the safest combination for sharing.