Video & audio toolkit
16 tools, runs entirely in your browser

Edit video and audio online without uploading a single file

SealedConvert is a free browser-based toolkit for converting, compressing, cropping, trimming and otherwise editing video and audio. Everything runs locally using ffmpeg.wasm — your file is processed on your own device and never touches a server. No accounts, no waiting on uploads, no privacy trade-off.

Your file never leaves your device — no upload, no server.

01 — File

Drag a file here, or click to browse

MP4, MOV, WEBM, AVI, MKV, MP3, WAV …

02 — Tool

Format

Visual

Time

Audio

Look

Extras

Target format

Video codec

Mode

Strength: Medium (CRF 28)

Preset

Aspect ratio is preserved automatically with presets.

Target aspect ratio

Crops centered to the chosen ratio.

Action

Frame rate

Start (sec)

End (sec)

Speed: 1.0×

Audio is stretched to match (pitch stays natural, within 0.5×–2×).

Runs entirely in memory — best for short clips (under ~30 sec).

Format

Quality

Change: +0 dB

Removes the entire audio track; the video is untouched.

Brightness: 0

Contrast: 1.0

Saturation: 1.0

Drag a logo/image here, or click to browse (PNG recommended)

Position

Size: 15%

Opacity: 85%

Start (sec)

Duration (sec)

Frame rate

For smooth results, keep duration under 10 seconds.

Timestamp (sec)

Format

Waiting for a file …

Before

After

Done.

↓ Download file

Edit video and audio online without uploading a single file

Before

After

Dedicated single-tool pages