MP4 to WEBM Converter Online Free

Convert MP4 videos to WebM online for websites, browser playback, and lighter video delivery. Free, fast, and no signup required.

Перетащите файлы сюда. Максимальный размер файла - 1 ГБ.

Выберите файл перед конвертацией.

Формат ввода

MP4 video

MP4 is the most common video container for phones, cameras, downloads, social apps, and editing exports. It is the safest source format when you need to create a web video version for browsers or websites.

Выходной формат

WEBM video

WebM is a web-focused video container commonly used for HTML5 video, browser playback, screen recordings, and lightweight online delivery. Convert MP4 to WebM when your website, app, or publishing workflow expects a WebM file.

How to convert MP4 to WEBM online

Use this MP4 to WEBM converter when you need a browser-friendly video file for a website, web app, CMS upload, or HTML5 video workflow. Upload your MP4, keep WEBM selected as the output, and download the converted WebM video when processing is complete.

Convertr works in your browser with no account and no software install. Files up to 1 GB are supported, and you can adjust codec, quality, bitrate, resolution, and audio settings before starting the conversion.

  1. 1 Upload your MP4 video file.
  2. 2 Choose WEBM as the output format.
  3. 3 Откройте настройки, если вам нужно настроить кодек, качество, битрейт, разрешение или параметры аудио.
  4. 4 Click Convert to start the MP4 to WEBM conversion.
  5. 5 Download your WEBM video when processing is complete.

WebM is useful for modern browser playback and web publishing. If you need the broadest device compatibility for iPhone, Android, TVs, or social uploads, MP4 is usually the safer target.

Why use WebM for online video?

MP4 is usually best for universal playback. WebM is useful when your workflow is built around modern browsers and web delivery.

HTML5 video publishing

Create WebM files for websites, landing pages, product demos, web apps, and browser-first video experiences.

Modern browser support

WebM is designed for the web and is commonly used with VP8, VP9, AV1, Vorbis, or Opus streams in browser playback workflows.

Без регистрации и установки

Convert directly in your browser without installing desktop software or creating an account.

Advanced output controls

Use settings when you need to tune quality, resolution, codec, bitrate, or audio options before exporting WebM.

MP4 to WEBM FAQ

Is this MP4 to WEBM converter free?

Yes. Convertr lets you convert MP4 to WEBM online for free with no registration, no watermark, and no software install.

Why convert MP4 to WEBM?

WebM is useful for websites, HTML5 video, browser playback, lightweight web delivery, and workflows that specifically ask for a .webm file.

Can I convert large MP4 files to WEBM?

Yes. You can upload MP4 videos up to 1 GB per file. This supports longer recordings, exports, demos, and downloaded videos that need a WebM version.

Will converting MP4 to WEBM reduce quality?

Quality depends on the source file and conversion settings. Use higher quality or bitrate settings when preserving detail matters more than creating a smaller WebM file.

Should I use WEBM or MP4 for video?

Use WebM for modern web publishing and browser-first workflows. Use MP4 when you need the safest compatibility across phones, TVs, messaging apps, social platforms, and older software.

Are my MP4 files private?

Files are processed securely for conversion and automatically deleted after the conversion flow. You do not need to create an account.

Related video conversion tools

Use these focused video converters when you need another common container, web video workflow, or compatibility export.

WEBM в MP4 MP4 в MKV MP4 в MOV MP4 to AVI MKV в MP4 MOV в MP4 VP9 в MP4 Видео конвертер

What happens when MP4 becomes WEBM

Исходный формат

MP4 is a widely supported media container, commonly carrying H.264 or H.265 video and AAC audio.

Формат целевого

WEBM is a web-focused container commonly carrying VP8, VP9, or AV1 video with Opus or Vorbis audio.

Какие изменения

The MP4 container is read and the selected video and audio streams are written into a WEBM container.

Codecs may be transcoded even when the visible resolution and duration stay the same.

Что сохраняется
Duration, frame order, and visible dimensions are preserved unless you select trimming, frame-rate, or resolution changes.
What may be lost
Extra subtitle, attachment, chapter, or alternate audio tracks may be omitted when the target container or selected settings do not support them.
Codec and quality implications
Container names do not guarantee a codec. Quality and compatibility depend on the selected video codec, audio codec, bitrate, frame rate, and resolution.
Realistic limitations
A valid MP4 extension does not guarantee that every codec inside the container is decodable. Corrupt, encrypted, or unusual streams can fail.

Шаги конверсии

  1. Upload a MP4 file no larger than 1 GB.
  2. Confirm that WEBM is selected as the target.
  3. Open settings only if you need to change codec, quality, bitrate, frame rate, resolution, or audio behavior.
  4. Start the conversion. A healthy compatible worker begins processing immediately.
  5. Download the WEBM file and check the result before deleting your source.

Проблемное решение

The MP4 file is rejected or will not open.
Confirm that the file is not empty, password-protected, or corrupt and that its real format matches the extension.
The WEBM file is larger than expected.
Choose a more efficient codec or lower quality setting when available. Lossless and uncompressed targets are often larger by design.
The result has no sound or will not play.
Try a broadly supported target codec and verify that the source contains a decodable audio stream.

Приватность и сохранение файлов

Uploads and converted files are processed automatically and irreversibly deleted within 24 hours. You can delete them sooner with the delete control. Convertr does not read, mine, sell, or manually review file contents.

Read the privacy policy

Полезные альтернативы

MP4 to AAC Use this when AAC better matches the app, codec, or editing workflow you need. MP4 to AIFF Use this when AIFF better matches the app, codec, or editing workflow you need. WEBM to MP4 Use the reverse conversion when you need to return to the original format family.