在线调整视频大小
调整视频大小 在线 直接在浏览器中以高质量处理. 立即试用此工具。 - 高速, 简单, HD画质, 精准 100% 在浏览器中本地处理，文件不会上传到服务器。立即免费试用。
将视频拖放到此处
支持 MP4、WebM、AVI、MOV
支持的格式
使用方法
步骤 1
加载视频
步骤 2
选择尺寸或比例（16:9、9:16、1:1.）
步骤 3
下载调整后的视频
常见错误
- Uploading a video file too large for the browser (keep it under 2 GB).
- Closing the tab before processing finishes: the conversion stops.
- Using an exotic input format (prefer MP4, WebM, MOV, AVI).
- Picking a bitrate so low that quality drops noticeably.
专业技巧
- Pick H.264 (MP4) for the widest compatibility.
- For the web, use WebM (VP9/AV1): smaller file at the same quality.
- Keep the original: processing is local but the download is final.
- On mobile, plug in the charger for long videos.
隐私保护
本地调整大小。您的视频永远不会离开您的设备。
为Instagram Reels调整大小 — 免费在线，无需注册
Instagram Reels需要垂直9:16格式（1080x1920）。将横向视频调整为理想格式。
也试试我们的工具: 免费在线裁剪视频.
技术细节
通过精确缩放将视频调整为4K, 1080p, 720p或480p：放大以提高清晰度，或缩小以减小文件大小。
Why choose our online video resizer
Our online video resizer stands out with 100% local processing via FFmpeg.wasm directly in your Chrome, Firefox, Safari or Edge browser — no server upload, no queue, no arbitrary size limit. You get a fast, free, no-signup, watermark-free tool compatible with all your MP4, MOV, AVI, MKV, WebM, FLV, WMV, M4V, 3GP files and more. Perfect for YouTubers, TikTokers, Instagram Reels creators, Premiere Pro editors, DaVinci Resolve, CapCut, Final Cut users, marketing pros, e-learning trainers and individuals who want to resize video online without installing heavy software like HandBrake, Adobe Media Encoder or VLC.
Cross-device compatibility — PC, Mac, iPhone, Android
Our video resizer works on Windows 10, Windows 11, macOS Ventura, Sonoma, Sequoia, Linux Ubuntu, Debian, Fedora, as well as iOS 16+ (iPhone, iPad), iPadOS, Android 10+ (Samsung Galaxy, Google Pixel, Xiaomi, OnePlus) and even Chrome OS on Chromebook. No native app, no APK, no .exe to download: just open the page in your favorite browser and start processing your videos. Compatible with videos from smartphones (4K HDR, slow-motion), GoPro cameras, DJI drones, OBS screen captures, After Effects exports, Loom screencasts and files downloaded from YouTube, Vimeo, TikTok, Twitch or Twitter/X.
Privacy, GDPR compliance and video security
Unlike competing services (Clideo, Kapwing, Veed.io, FlexClip, Online-Convert, Convertio, CloudConvert, FreeConvert, EZGif, Zamzar) that upload your files to remote servers in the US or Asia, our tool processes your entire video in your browser's RAM. Not a single byte is sent over the Internet, ensuring full GDPR, CCPA, LGPD and HIPAA compliance. Perfect for confidential business documents, medical, legal, educational videos, copyrighted content and any personal file you do not want to entrust to any third party.
探索所有视频工具
只需几次点击即可压缩、转换、剪辑、调整大小和编辑视频。
相关工具
常见问题
Instagram的尺寸是多少？
故事和Reels：1080x1920（9:16）。方形动态：1080x1080（1:1）。横向动态：1080x566（1.91:1）。