Naiara

From WEBM
to MP4.
Done.

Keeps the moving picture and the sound, if the original has it.

Convert my file

We don't keep your files after converting them.

Got several? Open your workspace

What do you want to convert?

Or drag it here · Up to 50 MB

Video

Keeps the moving picture and the sound, if the original has it.

The first video track and the first audio track are converted. Extra tracks and subtitles are left out.

Videos up to 10 minutes and 4K. The first video track and the first audio track are kept; subtitles and extra tracks are dropped.

Processed only for this conversion. The original and the result are deleted from the server when it's done.

Start with what you want to do.

Pick the result. We'll set up the conversion.

Browse all formats

What file do you have?

Pick its category and we'll show you what you can do with it.

My file is PDF. I need it as…

TXTText onlyJPGOne image per pagePNGOne image per pageWEBPOne image per pageDOCXEditable contentPPTXEditable contentXLSXDetectable tablesMDEditable content

One, ten,
or all at once.

Mix formats in the same queue, check the preview and download everything in a ZIP. Unlimited files per batch, free.

Open my workspace
Memories.jpgPDF
Presentation.docxPDF
Interview.mp4MP3

Example layout · your files are only processed when you press Convert.

All your tools.
Your way.

Every tool is free. Choose Plus to use AI, work without ads and restore your photos every month.

Naiara Free

€0

Free, with ads.

  • Every format and tool
  • Unlimited files per batch and ZIP download
  • Previews and private files
Start for free
Naiara PlusNo ads

€9.90 / month

One subscription for AI and your restorations.

  • AI features: summarise, translate and rewrite
  • No ads in any tool
  • 10 standard restorations every month
  • Everything in Free included

Renews automatically every month. Cancel from your account. Restoring and colorizing uses 2 credits. Monthly restorations don't roll over; credits bought in packs are kept. Technical limits per file still apply: 50 MB and up to 10 minutes of audio or video.

Changing formats should be this easy.

Your files are never published and don't appear in your restoration history.

  1. 1

    Choose your file

    Select one of the 54 supported formats, up to 50 MB.

  2. 2

    Tell us the format you need

    You'll only see options that work with your file. The conditions of each conversion appear before you start.

  3. 3

    Download and get on with your day

    Save the result from this tab. If you convert a multi-page PDF to images, you'll get them together in a ZIP.

How to convert WebM to MP4

WebM is the open video format designed for the web. Many screen recorders, browser extensions and video-call tools produce it, and it is common when saving clips from some sites. The problem is that the iPhone, some video editors and certain messaging apps will not accept it.

This converter turns your WebM into an MP4 with H.264 and AAC, the format almost every device and platform supports.

Step by step

  1. Click Select file and choose the .webm video (up to 50 MB and 10 minutes).
  2. Check that Convert to shows MP4.
  3. Click Convert video to MP4.
  4. Download the MP4 and share it or open it in your editor.

What changes in the video

A WebM usually carries VP8, VP9 or AV1 video with Opus or Vorbis sound. Everything is re-encoded: video to H.264 and audio to 160 kbps AAC. The first video and first audio tracks are kept; subtitles and metadata are not copied.

If the WebM had a transparent background, as some animations and stickers do, the MP4 will not keep it, because this format does not support transparency.

Screen recordings

WebM screen recordings sometimes cannot be scrubbed properly or show the wrong duration in some players. After conversion the MP4 has a normal index and is ready to start playing while it downloads.

Odd dimensions are rounded to the nearest even number, which H.264 requires. In recordings with small text, check that it is still legible before sharing. Videos up to 10 minutes, 4K and 50 MB are accepted.

Only need the sound?

If what matters is the audio of a call or a lecture recording, convert the WebM straight to MP3 instead: the file will be much smaller.

Frequently asked questions

Why won't my iPhone open WebM files?
Its WebM support is limited. An H.264 MP4 plays without problems.
Is the sound kept?
Yes, the first audio track is converted to AAC.
Is transparency kept?
No. H.264 MP4 does not support a transparent background.
Is there a length limit?
Yes, 10 minutes per video and 50 MB per file.