Interlace Video Merger review
A free local merger for short batches of compatible clips, with strict size and time limits.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Interlace Video Merger is a free browser-based utility for combining two to five video clips into one file. It suits people who want to join a small, private batch without uploading source files: processing happens locally in the browser. Inputs can be MP4, MOV, WebM or MKV, and users can reorder clips before merging and downloading the result. Its narrow job makes it appropriate for straightforward joins rather than broader video editing or long-form assembly.
The main distinction is how it handles the join. When the clips are compatible, Interlace copies streams instead of re-encoding them. The first clip determines the output dimensions; other clips are scaled to match and padded with black as needed. Clips without audio receive silent audio tracks. These rules make the first clip an important choice, and mixed-dimension or mixed-audio batches may not behave like a simple concatenation. Pick Interlace when its automatic matching and silent-audio handling fit the intended output; choose another tool if you need control over each clip’s treatment.
The limits define the audience more than the free price does: files can be up to 500 MB each, and processing is capped at 10 minutes. That confines it to short, modest batches and rules it out for longer footage or larger files. For a quick local merge of compatible clips within those boundaries, the focused feature set is clear. For extended projects, detailed editing, or finer output control, a more capable video editor is a better fit. The merger itself is free; Interlace also offers separate paid plans for its broader video-generation platform.
Interlace Video Merger pros and cons
- Where it wins
- Processes clips in the browser without uploading them
- Reorders and joins two to five MP4, MOV, WebM or MKV clips
- Copies streams when compatible; scales and pads mismatched clips
- Where it doesn't
- Each file is limited to 500 MB
- Processing is limited to 10 minutes
- Output follows the first clip’s dimensions, with mismatches scaled and padded black
Interlace Video Merger fact sheet, pricing and score →
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