Video & Audio

Convert video and audio between formats

Different players, editors and platforms expect different containers and codecs. The video converter changes a clip between MP4, WebM, MOV and other formats so it plays where you need it, and the audio converter moves a track between MP3, WAV, AAC, OGG and FLAC for podcasts, samples and archives. Both run server-side with ffmpeg, which is why they can handle real codecs that a browser alone cannot transcode.

Cut, crop and rearrange clips

For editing without installing a desktop suite, the video trimmer cuts a clip down to a chosen start and end, the video cropper reframes the picture to a new aspect ratio, and the video concatenator joins several clips into one. Need a fixed-length sample of a song? The audio trimmer does the same for sound files.

Adjust speed, direction and sound

The video speed changer creates slow-motion or time-lapse output, the video reverser plays a clip backwards, and the mute video tool strips the audio track when you want a silent clip. To work with the sound separately, the extract audio from video tool pulls the soundtrack into a standalone audio file.

Make GIFs, shrink files and capture audio

The video to GIF tool turns a short clip into a looping animated GIF for chats, docs and issue trackers, while the video compressor reduces file size so a clip fits an upload limit or email attachment. For visualizing or recording sound, the audio waveform generator renders a waveform image from a track, and the voice recorder captures audio straight from your microphone.

What these tools are good for

• Compatibility - convert a video or audio file into a format your target player or platform accepts.
• Quick edits - trim, crop, join, reverse or change the speed of a clip without a full editor.
• Sharing - turn a moment into a GIF or compress a video to fit an upload or attachment limit.
• Audio work - extract a soundtrack, mute a clip, trim a track or convert between audio formats.
• Capture and visuals - record a voice memo or generate a waveform image from existing audio.

How processing and privacy work here

Video and audio encoding is too heavy to run reliably inside a browser tab, so these tools differ from the rest of ZeroUtil: your file is uploaded over an encrypted connection, processed on our server with ffmpeg, and made available as a download link. The uploaded source and the generated output are deleted automatically a short time after the job completes, and there is no signup or stored account history. If a file is highly sensitive, keep that auto-deletion window in mind and avoid uploading anything you are not comfortable processing off-device.