Video Merger
Join multiple videos into one file
What is Video Merger?
Video Merger is a free browser-based video tool from Farvixo that lets you join multiple videos into one file. It uses an in-browser FFmpeg build compiled to WebAssembly, so even large clips are processed on your own machine and never uploaded. No account, no watermark and no per-file size limit imposed by a server.
How to use Video Merger
Select a video file in Video Merger. Conversion happens in your browser using WebAssembly, so even large files never get uploaded anywhere.
Choose the output format, resolution and bitrate — or start from a ready-made preset if you are not sure what to pick.
Start the conversion and watch the progress bar; longer clips take a little time because the work runs on your own machine. Download when it finishes.
Frequently Asked Questions
Do the clips need the same resolution?
They do not have to be, but mixing them means everything is re-encoded to a common size, which takes longer and costs a little quality. Clips that already match in resolution, frame rate and codec join almost instantly.
Why is the audio out of sync after merging?
Usually a frame-rate mismatch between clips, or a source with variable frame rate — phone recordings often are. Normalising to a constant frame rate during the merge fixes it.
Can I set the order?
Yes. Drag the clips into the order you want before merging; they are joined exactly as listed.
Is there a limit on how many videos?
No. Since processing is local there is no server-imposed cap — only what your device can hold in memory while working.
Is there a quality loss when merging?
None if the clips share codec, resolution and frame rate — the streams are copied. Mismatched clips must be re-encoded to a common format, which costs a little.
What you can use Video Merger for
- Getting a clip under the size limit for WhatsApp, Gmail, Discord or a course upload
- Converting a recording to a format a specific player, editor or platform accepts
- Editors who want a quick change without opening a full desktop suite
- Handling confidential footage that must not be uploaded to an online converter
Video Merger at a glance
- Tool
- Video Merger — Video Tools
- Purpose
- Join multiple videos into one file
- Input
- One or more files (MP4, WebM, MOV, AVI, MKV)
- Output
- Video file in the selected container and codec
- Processing
- In your browser — files are never uploaded to a server
- Price
- Free, unlimited, no account required
- Limitations
- Bounded by your device's memory and CPU rather than a server quota; very large files may be slow on older hardware
Tips for better results
- Processing speed depends on your own CPU, since the work is local. A laptop on battery-saver will be noticeably slower.
- H.264 (MP4) is the safest choice for compatibility; VP9 or AV1 give smaller files but decode slowly on older devices.
- Leave the tab open and visible — a backgrounded tab gets throttled by the browser and the encode will crawl.
Common problems and how to fix them
The encode is very slow
Everything runs on your device rather than a server farm. Pick a lower resolution or a faster preset, keep the tab in the foreground, and close other heavy tabs.
The output has no sound
The chosen container cannot carry the source audio codec — WebM cannot hold AAC, for example. Re-encode the audio instead of copying the stream.
The browser ran out of memory
The clip is too large to hold in memory. Trim it into shorter segments and process them one at a time.
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