5 free browser-based tools to resize, inspect and extract thumbnails from short video files - no software required.
Resize short video clips for social media platforms.
View codec, resolution, duration and other video metadata.
Extract a frame from a video to use as a thumbnail.
Resize videos to TikTok's 9:16 vertical format.
Resize videos for Instagram Reels, Stories and feed posts.
Understand which aspect ratio to use for each platform and use case.
Extract the best frame from your video for a sharp, usable thumbnail.
Understand resolution, bitrate and why bigger is not always better.
Common questions about browser-based video tools, formats and resizing.
Support depends on your browser and device. Most modern browsers support MP4 (H.264), WebM (VP8/VP9) and some support HEVC. MOV files may work in Safari. If a video does not load, try converting it to MP4 first.
There is no hard server-side limit because processing happens locally in your browser. Practical limits depend on your device memory. Large video files (over 500 MB) may be slow or cause memory issues on mobile devices.
TikTok and Instagram Reels use 9:16 (vertical). Instagram feed posts work best at 1:1 (square) or 4:5 (portrait). Instagram Stories use 9:16. The dedicated resizer tools apply the correct dimensions automatically.
Yes. The Video Thumbnail Maker lets you scrub through the video and capture any frame as a JPG or PNG image. You can use this for thumbnails, previews or any other purpose.
The Video Metadata Inspector displays information the browser can read from the video file, including resolution, duration, frame rate and codec information where available. Some metadata fields depend on browser support.
Resizing changes the pixel dimensions and may apply padding or cropping to fit the target aspect ratio. The output quality also depends on the browser's video encoding capabilities. For professional video editing, dedicated software will give more control.
Tool reference
Video tools cover short browser workflows for resizing clips, inspecting information and capturing thumbnails. Codec support, CPU use and available memory vary by browser and device.
Resize short video clips for social media platforms. Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. Play the full result with sound, inspect the beginning and end, and check aspect ratio, crop, orientation and synchronization. Do not assume a video is valid because the first frame looks correct.
View codec, resolution, duration and other video metadata. Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. Compare the reported dimensions, duration and available codec information with the requirements of the destination platform. Some metadata fields are unavailable in some browsers.
Extract a frame from a video to use as a thumbnail. Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. Preview the thumbnail at the small size where it will actually appear. Check faces, text, contrast, crop and whether the selected frame communicates the subject immediately.
Resize videos to TikTok's 9:16 vertical format. Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. Play the full result with sound, inspect the beginning and end, and check aspect ratio, crop, orientation and synchronization. Do not assume a video is valid because the first frame looks correct.
Resize videos for Instagram Reels, Stories and feed posts. Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. Play the full result with sound, inspect the beginning and end, and check aspect ratio, crop, orientation and synchronization. Do not assume a video is valid because the first frame looks correct.
Complete category reference
Video workflows depend on aspect ratio, resolution, codec, duration, bitrate and device capability. Short browser operations can be convenient, but large or unusual media files can exceed practical browser memory or codec support.
Resize short video clips for social media platforms.
Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. Resizing changes the output frame dimensions and can require scaling, cropping or padding to fit a target aspect ratio. Re-encoding can also affect file size and visual quality.
Before you finish, Play the full result with sound, inspect the beginning and end, and check aspect ratio, crop, orientation and synchronization. Do not assume a video is valid because the first frame looks correct.
View codec, resolution, duration and other video metadata.
Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. The browser reads information it can expose about the video, such as dimensions and duration, without intentionally changing the source file.
Before you finish, Compare the reported dimensions, duration and available codec information with the requirements of the destination platform. Some metadata fields are unavailable in some browsers.
Extract a frame from a video to use as a thumbnail.
Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. A single decoded frame is exported as a still image. The thumbnail does not change the source video and should be chosen from a frame that is sharp, representative and free from motion blur.
Before you finish, Preview the thumbnail at the small size where it will actually appear. Check faces, text, contrast, crop and whether the selected frame communicates the subject immediately.
Resize videos to TikTok's 9:16 vertical format.
Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. Resizing changes the output frame dimensions and can require scaling, cropping or padding to fit a target aspect ratio. Re-encoding can also affect file size and visual quality.
Before you finish, Play the full result with sound, inspect the beginning and end, and check aspect ratio, crop, orientation and synchronization. Do not assume a video is valid because the first frame looks correct.
Resize videos for Instagram Reels, Stories and feed posts.
Use it when you need preparing short video files for social sharing, inspection or thumbnail creation. Resizing changes the output frame dimensions and can require scaling, cropping or padding to fit a target aspect ratio. Re-encoding can also affect file size and visual quality.
Before you finish, Play the full result with sound, inspect the beginning and end, and check aspect ratio, crop, orientation and synchronization. Do not assume a video is valid because the first frame looks correct.