Video Poster / Thumbnail Maker
Pick a timestamp and export a high-quality poster or thumbnail image from a video in your browser. No uploads - ffmpeg.wasm runs locally.
🔒 Runs entirely in your browser — nothing is uploadedCreate a clean poster image for any video
A poster or thumbnail is the still image that represents a video before it plays. Streaming pages, blog embeds, social previews and video players all show one to set expectations and attract clicks. This tool lets you choose the exact moment of a local video and export it as a sharp poster image without opening a separate editor. Enter a number of seconds, a decimal value for fine control or a mm:ss timestamp copied straight from a player, then download a single high-quality frame.
Everything is processed in your browser. Rather than uploading the whole clip to an online service, the page loads ffmpeg.wasm, writes the selected file into the in-memory media engine and seeks to the moment you requested. The poster is encoded with quality-focused settings and downloaded directly, while the temporary files are cleared from the engine afterwards. That makes it safe for unreleased footage, client work, internal demos and personal recordings.
Pick the format and size that fit
PNG is the right choice when the frame includes text, charts, interface elements or fine edges that should stay crisp, because it does not add compression artifacts. JPG is exported with a high-quality setting and produces a much smaller file, which suits camera footage, scenery and thumbnails that need to load quickly on the web. You can also set a target width in pixels: leave it blank to keep the original resolution, or enter a value and the height scales automatically to preserve the aspect ratio, which is handy for fixed-size cover images.
Tips for the perfect frame
Posters work best when they show a clear, well-lit moment rather than a blurry transition. Scrub to a point where the subject is sharp and avoid fast motion frames that may look smeared. If the export lands slightly before or after the moment you wanted, nudge the timestamp by a fraction of a second and run it again. Large or high-resolution videos take a little longer because all of the work runs on your device. The first export may pause while the WebAssembly engine downloads, but later exports in the same tab start without that wait.
How to use
- Choose a videoDrop or browse for the local video you want a poster from.
- Pick a momentType the timestamp in seconds or mm:ss and choose a format and width.
- ExportGenerate a high-quality poster image locally and download it.