How do I convert a video or WAV to MP4?

Drop your file, pick the output format and options (resolution, codecs, subtitles), then convert. The file downloads locally.

What formats are supported?

Video: MP4, MOV, AVI, MKV, WebM, WMV, FLV, 3GP, MPG… Audio: WAV, MP3, M4A, FLAC, OGG, OPUS, AAC, etc.

How do automatic subtitles work?

Whisper transcribes audio in the browser; you edit the SRT shown, then convert with soft or burned-in subtitles.

Local video · Browser FFmpeg · No server upload

Convert video online.

Q: Is my video sent to your servers?

No: conversion and transcription run entirely in your browser (WebAssembly).

Convert MP4, MOV, MKV, AVI, WebM, WMV, FLV, 3GP, MPG, OGV, WAV or MP3 in your browser — with video, audio and subtitle settings.

Convert a video See settings

Local processing

Video + audio

SRT subtitles

Drag and drop a video or audio file

MP4, MOV, MKV, AVI, WebM, WMV, FLV, 3GP, MPG, OGV, WAV, MP3, M4A, FLAC, OGG, OPUS…

Choose a file

Conversion engine (FFmpeg)

One-time ~30 MB download in your browser. Required to convert or extract audio.

~30 MB

Status Starting…

Export settings

Control format, picture and sound.

Essential options up front; rotation, bitrate and subtitles below.

Output format

MP4 recommended

More formats (3GP, FLV, WMV…)

WMV and 3GP may fail in some browsers (codec limits in WebAssembly). Prefer MP4 or WebM if conversion errors occur.

Export preview

video.mp4

—

Select a file first. The button shows the output format.

Video resolution

Video codec

Audio codec

Frame rate & volume

Advanced settings

Subtitles and fine tuning.

Generate subtitles in the browser, import .srt/.ass, edit text, then convert with soft or burned-in subs.

Rotation & flip

Rotation

Flip

Audio bitrate

⚡

Powerful conversion

Video and audio formats in a clear interface.

✓

Private processing

Your video stays in the browser.

▣

Built-in subtitles

Generate, import, edit and export SRT.

Reassurance

How it works

Upload a video or audio file: WAV, MP3, MP4, MOV, MKV, WebM…

Set format, resolution, codecs, volume and optional subtitles.

Download the result — nothing is stored on our servers.

FAQ

Frequently asked questions

How do I convert WAV to MP4? +

Drop the WAV, choose MP4: a still image + audio track is created in the browser.

What video and audio formats are accepted? +

MP4, MOV, AVI, MKV, WebM, WMV, FLV, 3GP, 3G2, MPG, OGV, WAV, MP3, M4A, FLAC, OGG, OPUS, AAC, AIFF…

Can I edit generated subtitles? +

Yes: after generation, edit the SRT text, then convert with soft or burned-in subtitles.

Is my video sent to your servers? +

No: everything runs in your browser.

I only want the audio from a video +

Choose WAV or MP3 as output, or use our extract-audio tool.