Free Online Video Aspect Ratio Converter

Our converter supports all major video formats including MP4, MOV, AVI, WebM, and MKV. The output format is WebM, which is widely supported and offers excellent quality with smaller file sizes. You can easily convert WebM to other formats if needed.

Yes, the maximum file size is 500MB. This ensures smooth processing in your browser. If you have larger files, consider compressing them first or splitting them into shorter segments. Most social media videos are under this limit anyway.

Conversion time depends on your video length and device performance, but typically takes 1-3 minutes for a 1-minute video. Shorter videos process faster. All processing happens locally in your browser, so your device's CPU speed affects the conversion time.

We preserve your original video quality as much as possible. The video is fitted to your chosen aspect ratio with black bars (letterboxing or pillarboxing) to maintain the original content without stretching or distorting. The bitrate is set to 5 Mbps for high-quality output.

Absolutely! While we provide popular presets like 1:1, 9:16, 4:5, and 16:9, you can enter any custom dimensions up to 3840x3840 (4K resolution). Just type your desired resolution in the format '1080x1920' and click convert.

Yes! All video processing happens entirely in your browser using client-side technology. Your videos are never uploaded to our servers or stored anywhere. This ensures complete privacy and security for your content. Once you close the page, all data is cleared from your browser.