Timestamp
Use a precise time when you already know the frame you need. Seek accuracy depends on the decoder, keyframes and implementation.
1. Select video
Add a video
Drop a video here
or click to browse
Supported formats: MP4, WebM, MOV, MKV, MPEG-TSMax file size: 500 MB
Sample video:
2. Choose frame range
Use an interval for regular contact sheets or a count for evenly spaced previews.
seconds
Ignored when thumbnail count is set.
Leave empty to extract all interval-based thumbnails.
Use seconds, mm:ss, or hh:mm:ss.
Leave empty to use the full video.
Higher quality creates larger files.
3. Set thumbnail output
3. Set thumbnail output
Select a video source, then generate thumbnails.
4. Review thumbnails
Generated thumbnails
Generated thumbnails
How do I create multiple thumbnails from a video?
Choose a video, define a start and end range, set an interval or thumbnail count, select image size and format, then generate and review the frames before downloading them.
Thumbnail generation extracts still images; it does not edit video
The tool decodes selected video frames and saves them as image files. The source duration, audio and video stream remain unchanged. Use it for poster frames, galleries and review assets, not for changing the video itself.
Who needs video thumbnails?
Publishers, CMS teams, developers, editors, QA engineers, teachers and social-content teams use extracted frames as poster images, gallery cards, storyboards, test fixtures and review references.
Common thumbnail workflows
- Create a poster frame for an HTML5 video player.
- Build a gallery or chapter overview from regular intervals.
- Choose a strong preview image for a CMS or social post.
- Create a contact sheet for review and QA.
- Inspect visual changes without scrubbing the entire video.
- Prepare reference frames for scene, overlay or subtitle work.
How to generate video thumbnails
Choose a local video or a direct URL the browser can read.
Select the full video or set a start and end range.
Choose a single timestamp, regular interval or target count according to the available mode.
Set image format, width, quality and file naming.
Generate the frames, inspect sharpness and composition, then download individual images or the supported batch format.
How to choose thumbnail settings
Interval
Best for systematic sampling. A shorter interval produces more images and uses more time and memory.
Thumbnail count
Useful when you want a fixed number of frames spread across a range. The actual timestamps should be shown with each result.
JPG, PNG and WebP
JPG is broadly compatible and compact for photographic frames. PNG is lossless but often larger. WebP can be efficient when the destination supports it.
Image width and quality
Choose enough pixels for the display context. Upscaling beyond the decoded frame does not add real detail; high JPG/WebP quality increases file size.
How thumbnail extraction is handled
When confirmed by source code, local video frames are decoded and encoded as images in the browser. URL mode still downloads media from the source host and depends on CORS, authorization and byte-range behavior.
Thumbnail generator limitations
- A frame near a cut can differ by a few frames depending on seeking and keyframe behavior.
- HDR or wide-gamut video may be tone-mapped or color-converted by the browser pipeline.
- Large batches and high-resolution images can exhaust memory.
- An extracted frame cannot contain detail that is absent from the source video.
Common thumbnail problems
The frame is not at the exact moment
Move the timestamp slightly or use a decoder path that supports more precise seeking. Keyframe-based seeking can land nearby.
The image is black
The selected time may be before decodable content, inside a transition, or unsupported by the current codec. Try a nearby timestamp.
Colors look different
The browser may convert color space or HDR to standard image output. Check the destination color requirements.
Batch download fails
Reduce the number or dimensions of images, or download selected frames individually if ZIP generation exceeds memory.
Video thumbnail FAQ
What is a video thumbnail?
It is a still image extracted from a video frame and used as a preview, poster, gallery card or reference.
Can I generate several thumbnails at once?
Yes when interval or count mode is supported. Set a range and limit the batch to a practical number for browser memory.
Which image format should I choose?
Use JPG for compact photographic previews, PNG when lossless output matters, and WebP when the destination supports it and smaller files are useful.
Does generating thumbnails change the video?
No. The tool reads frames and creates separate image files.
Can I choose an exact timestamp?
Yes in timestamp mode, although actual frame accuracy depends on the decoder, keyframes and the source timestamps.
Why is a thumbnail blurry?
The source frame may contain motion blur or low resolution, or the output may be enlarged too far. Choose another moment or a larger source.
Can I create a YouTube thumbnail with this tool?
You can extract a candidate frame, but platform specifications and design requirements may change. Add final text or branding in an image editor and check current destination rules.
Can I use a video URL?
Only when it is a direct media URL that the browser may access. Web pages, expiring links, authentication and CORS can prevent loading.
Are local videos uploaded?
Only claim browser-local processing when verified in the implementation. URL sources are still fetched from their remote host.
Why is there a maximum number of thumbnails?
Each decoded frame and encoded image consumes memory. A limit protects the tab from freezing or crashing.
Related video tools
AI Scene DetectionFind visual cut points and use representative scenes as thumbnail candidates.Video TrimmerNarrow the source range before extracting preview frames.Video OverlayAdd labels or callouts before generating final branded previews.Metadata ExtractionInspect source resolution, duration and codecs before batch extraction.