--- title: "Video Resolution Changer - 1080p, 720p" description: "Change video resolution online to 1080p, 720p, 480p, or custom dimensions. Preserve aspect ratio and download a private H.264 MP4." url: https://candoya.com/tools/video-resolution-changer/ locale: en type: browser-tool --- # Video Resolution Changer Category: [Social & Creator](https://candoya.com/tools/social/) ## What does a video resolution changer do? A video resolution changer scales every frame to a new pixel width and height. Choose a standard setting such as 1080p or 720p, or enter custom dimensions with the source aspect ratio locked. The video is processed locally in your browser and exported as a watermark-free MP4. **Resolution describes the number of pixels in each video frame.** A 1920 x 1080 clip has more than twice as many pixels as a 1280 x 720 clip. Lowering resolution can make a video easier to play or share, although final file size also depends on duration, frame rate, codec, and bitrate. This changer loads a WebAssembly video engine only after you start. It uses Lanczos resampling, outputs H.264 video with YUV 4:2:0 pixels, and carries the first audio stream into AAC. Subtitles, chapters, extra tracks, attachments, and source metadata are not copied. The output is always MP4 for broad browser and device support. ## How to use it 1. **Choose a video** - Drop a common video file into the workspace or use the built-in sample to inspect the controls. 2. **Pick a resolution** - Choose 2160p, 1440p, 1080p, 720p, 480p, or 360p, or type a custom pixel width and height. 3. **Set the aspect ratio** - Keep the lock on to preserve the source shape, or turn it off only when you intentionally need independent dimensions. 4. **Process and download** - Start the local conversion, review the finished MP4 in the preview, and download it without a watermark. ## Who it's for - **Course creators** can turn a 4K screen recording into 1080p or 720p before placing it in a learning platform. - **Remote teams** can scale sensitive meeting clips locally before sharing them with colleagues. - **Web publishers** can produce a predictable playback resolution for a product page or help article. - **Device owners** can make a high-resolution clip easier to play on older hardware without installing an editor. ## Expert note A 1080p preset means an output height of 1080 pixels here, so a portrait source becomes about 608 x 1080 rather than being forced into 1920 x 1080. H.264 YUV 4:2:0 works most reliably with even dimensions, so odd custom values are rounded down by one pixel. ## Frequently asked questions ### Is my video uploaded when I change its resolution? No. The selected file is read in this browser tab, and a WebAssembly video engine creates the result on your device. The engine code downloads when first used, but the source and finished video are not uploaded to CanDoYa or saved in an account. ### Is this video resolution changer free? Yes. You can use the standard presets, enter custom dimensions, process the clip, preview the output, and download the MP4 without an account, subscription, watermark, or export credit. Your device supplies the processing power, so there is no server queue. ### How large a video can I process? The conservative limit is 100 MB on mobile or lower-memory devices, 250 MB on a typical desktop, and 500 MB on a high-memory desktop. Long and high-resolution clips can still exhaust browser memory because the source, engine data, and output may exist at the same time. ### Can I change a video to 1080p or 720p? Yes. Choose 1080p or 720p and the tool sets that output height while calculating an even width from the source aspect ratio. For a standard 16:9 source, those presets produce 1920 x 1080 and 1280 x 720. Portrait and square sources keep their own shape. ### Does increasing video resolution improve quality? No. Upscaling creates more output pixels by interpolating the pixels already present, so it can meet a dimension requirement but cannot recover missing detail. For the clearest result, start with the highest-quality source available and avoid repeated re-encoding. ### What happens if I turn off the aspect-ratio lock? The width and height become independent. If their ratio differs from the source, the picture stretches wider or taller to occupy the exact output frame. Keep the lock enabled for natural proportions; disable it only when a fixed system requirement matters more than preserving shape. ### Will the output keep audio and subtitles? The first readable audio stream is re-encoded as AAC and included in the MP4. Silent sources remain silent. Subtitles, extra audio tracks, chapters, attachments, and metadata are omitted so the browser export stays predictable and broadly compatible. ### Why does changing resolution take time? The browser must decode, scale, and encode every video frame on your device. Duration, source resolution, codec complexity, and available memory affect the time. Keep the tab open during processing, and use a desktop editor for very long or unusually large footage. ## Related tools - [Video Resizer](https://candoya.com/tools/video-resizer/) - [Video Compressor](https://candoya.com/tools/video-compressor/) - [Video Converter](https://candoya.com/tools/video-converter/) - [FPS Changer](https://candoya.com/tools/fps-changer/) - [Video Metadata Viewer](https://candoya.com/tools/video-metadata-viewer/) --- *Markdown edition of , published for AI agents and other automated readers. Index of key pages: .*