Video & Audio Converter

Convert formats entirely in your browser. Nothing leaves your device.

🔒 No upload Max ~2 GB Files stay on device

Drop video or audio, or click to browse

MP4 · MOV · MKV · WebM · MP3 · WAV · and more

How it works

Add files

Drop or select video/audio from your computer. The drop zone is replaced by a preview of your files. Nothing is uploaded.

Choose format

Pick MP4, MOV, MP3 or GIF. Click Convert — processing runs only on your device with a live progress bar.

Download

When conversion finishes, the green Download button appears. Save the file instantly to your device.

Image Converter & Editor

Resize, crop, compress and convert — all privately on your device.

Resize & crop Social presets PNG · JPG · WebP · AVIF

Drop an image, or click to browse

PNG · JPG · WebP · AVIF · GIF

Convert to

Resize

Keep aspect ratio

Image fit (when aspect unlocked)

Fill color #000000

Social presets

Crop & transform

Quality & enhance

Quality 90%

Bright

How it works

Upload

Drop an image. The drop zone is replaced by a live canvas preview. Your file never leaves the browser.

Edit

Resize with aspect lock, use social presets (Instagram, YouTube Thumbnail/Shorts, Reels), crop, rotate, or change fill color (default black).

Download

Export as PNG, JPG, WebP or AVIF with the green Download button. Quality slider applies to JPG and WebP.

Learn & stay private

Short guides on formats, privacy, and best practices.

Privacy

Why private conversion matters

Most online converters upload your files to a server. That risks leaks, logs, and third-party access. ConvertFlow runs FFmpeg and canvas processing only in your browser — your media never leaves the device.

Video

MP4 vs MOV vs GIF: which to choose

MP4 is the universal web and phone format. MOV is common from Apple devices. GIF is for short, silent loops. Learn when each makes sense and what quality settings to use.

Image

Instagram, YouTube & TikTok sizes explained

1080×1080 posts, 1080×1920 Stories/Reels/Shorts, 1280×720 thumbnails. Use the right preset so platforms don’t crop or stretch your image.

Tips

Faster conversions and smaller files

Keep resolution reasonable, use WebP or AVIF for photos, and prefer MP4 with H.264 for video. Browser conversion works best under a few hundred MB; very large files may need patience or a desktop tool.