Fit Video to Any Canvas
Processing entirely on your device — large files may take a moment.
Pick the target canvas and the video is composited twice: the frame itself scales up and blurs into the background, while the untouched original sits centered in front at full sharpness. No black bars, no cropped faces — the whole picture survives.
This is the standard social-media adaptation: 16:9 footage into a 9:16 story, a vertical clip into a square feed post, or the reverse. Audio passes through untouched.
How to fit video to canvas
- 1
Select your files
Drag & drop your MP4 files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to MP4". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted MP4 file individually, or grab everything at once as a ZIP archive.
About the MP4 format
MP4 (MPEG-4 Part 14) is the universal delivery container of digital video. It wraps H.264, HEVC or AV1 video with AAC audio, and its structure — separate metadata (moov) and media atoms — is what makes streaming, seeking and fast-start playback possible. Phones, cameras, TVs, browsers and every social platform assume MP4 first.
Quality is entirely a function of the codec and bitrate chosen at encode time, so an MP4 can be a 10 Mbps HEVC master or a postage stamp. That flexibility plus total playback coverage is why nothing has displaced it in twenty years — conversion between formats almost always ends in MP4.
+Strengths
- ✓Plays on every device and platform in existence
- ✓Streaming-ready structure (fast start, seeking)
- ✓Choice of modern codecs: H.264, HEVC, AV1
!Limitations
- −Quality depends entirely on encode settings
- −HEVC variants hit licensing gaps on some platforms
Frequently asked questions
Will the video itself be distorted?
Never. The foreground keeps its exact aspect ratio and is centered; only the blurred backdrop stretches to fill the canvas.
Why a blurred background instead of black bars?
Black bars read as unfinished on social feeds. The blurred fill uses the video's own colors, so the post looks intentional and the eye stays on the sharp center.
Which canvas for which platform?
9:16 for Stories/Reels/Shorts, 1:1 for feed posts, 16:9 for YouTube-style players. The tool outputs exactly the pixel dimensions of each.