Click at the bottom. This combines the parts into a single 1080p file without re-encoding, meaning the process is fast and preserves the original quality. 2. Adding or Editing Text (Subtitles & Metadata)

You can use VEED.io or MKVToolNix to "mux" an SRT subtitle file into your MKV container.

For permanent text overlays (like titles or watermarks), online editors like Canva allow you to upload MKV files, add text layers, and export them. 3. Quick Video Editing

If you have a video that is split into multiple parts, the most recommended tool for joining them without losing quality is . Download & Setup: Get the free MKVToolNix GUI. How to Merge: Drag your first MKV file into the Source files window.

Right-click the file and select to add subsequent parts.

For basic editing (trimming or joining) of 1080p MKVs, you can use: Add Text To Video Online For Free - Canva

If you want to add a text-based chapter list, you can import .xml or .txt chapter files directly in the "Output" tab of MKVToolNix .

If your goal is to "put together" text with a video (such as subtitles or titles):

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