Merge videos online - join several clips into one file

The merged video always takes the frame size of the first clip in the list. Every other clip is scaled to fit inside that frame without stretching, so if the aspect ratios differ you get black bars. For example, if the first clip is landscape 1920×1080 and the second is a vertical phone video at 1080×1920, the second one is centred in the 16:9 frame with black bars on the left and right.

Want a vertical result for Reels, Shorts or TikTok? Move a 1080×1920 clip to the top of the list before merging. Not sure which proportions you need? The aspect ratio calculator helps you check.

• All clips have sound - the audio is joined into one stereo track at 48 kHz.
• Only some clips have sound - the silent clips get matching stretches of silence, so picture and sound stay in sync from the first second to the last.
• No clip has sound - the result is silent as well.

MP4 output uses AAC audio and WebM uses Opus. If your browser cannot encode audio for the chosen format, the tool warns you before you start and suggests WebM. Need to strip the sound completely afterwards? Use remove audio from video, and for audio-only files try merge audio.

Clips from a phone, a camera and a screen recorder usually differ in codec, frame size and audio settings. To fit them into one consistent file, every frame is decoded and encoded again with your browser's WebCodecs engine. MP4 output uses H.264 when the browser offers it (with HEVC, VP9 or AV1 as fallbacks), WebM uses VP9 or VP8. If no MP4 encoder is available, the result is saved as WebM and you are told why.

As a rough guide, three 2-minute 1080p clips take around 2-6 minutes on a recent laptop with hardware H.264 encoding. Output size is roughly 30-60 MB per minute at 1080p. If that is too much for email or a messenger, shrink it in the video compressor.

1. Trim first. Cut each clip down to the part you need with trim video. Merging whole files makes encoding longer and the output larger.
2. Put the target resolution first. The first clip decides the frame size of the whole video.
3. Keep one orientation. Mixing portrait and landscape footage always adds black bars.
4. Use a computer for long sets. The output is built in memory, so several gigabytes of footage are easier to handle on a desktop than on a phone.

Your files are processed locally and never uploaded, so this is safe for private recordings and client footage.