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Merge WebM Files into One Video

Have a stack of WebM clips from a browser screen recorder or a video call? Join them into one MP4, or a MOV, AVI, VOB or MP3, without uploading a thing.

Convert a video
Works with
  • MP4
  • MOV
  • AVI
  • VOB
  • MKV
  • WEBM
  • MPG
  • MPEG
  • M4V
  • 3GP
  • TS
  • MTS
  • M2TS
  • Runs in your browser
  • 100% free
  • Private
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How to merge WebM files

  1. Collect your WebM clips

    Drop the .webm files from your screen recorder, video calls or downloads onto the page.

  2. Line them up

    Files appear in filename order. Drag them or use the arrows until the clip you want to play first is at the top.

  3. Convert and save

    Keep MP4 or choose MOV, AVI, VOB or MP3, then click Merge & convert. WebM is always fully converted, so allow some time for long recordings.

Why people use Adapterry

  • Nothing is uploaded

    Your videos are processed in your browser and never leave your device.

  • No account needed

    Open the page and start. No email, no password.

  • No watermark

    Your video comes out clean, with no logo stamped on it.

  • Works offline

    Once the page and video engine have loaded, you can keep working without an internet connection.

Supported formats

Add MP4, MOV, AVI, VOB, MKV, WebM, MPG, M4V, 3GP, TS or MTS files, or a mix, and get back one MP4, MOV, AVI or VOB, or an MP3 of the sound. MP4 plays almost everywhere.

InMP4MOVAVIVOBMKVWEBMMPGMPEGM4V3GPTSMTSM2TSOutMP4MOVAVIVOBMP3
See all formats

Why WebM clips are always converted

WebM holds VP9 or VP8 video with Opus audio. Browsers play it well, but many phones, TVs and video editors don't. Adapterry re-encodes WebM to H.264 and AAC for MP4 and MOV, or to the codecs of the format you pick.

Screen recordings often have no sound, and clips from different windows can have different sizes. Clips without sound get silent audio so they join with the rest, and clips with a different shape get black bars. The first clip sets the frame size, up to 1920x1080.

Questions and answers

Why does merging WebM take longer than MP4?

WebM uses VP9 or VP8 video and Opus audio, so every clip is fully converted. MP4 clips with matching H.264 settings can skip that step.

Can I merge browser screen recordings that have no sound?

Yes. Adapterry adds silent audio to clips without sound, so they join with the clips that have it.

Will I see a preview of the merged WebM video?

Yes, if you save as MP4 or MOV, it plays on the page. An MP3 plays on the page too. AVI and VOB go straight to download, since browsers can't play them.

Can I turn several WebM recordings into one MP3?

Yes. Choose MP3 as the output and their soundtracks are joined back to back, in list order.

Will my WebM merge work on a phone?

Short clips usually do. Long screen recordings need more memory, so Chrome or Edge on a desktop computer is the safer choice.