Microdeck.tools 100% In-Browser

Video Frame Extractor & 4K Thumbnail Grabber

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Open multi-GB local MP4, MOV, or WebM videos instantly with zero upload, scrub or step -1/+1 frames at 24/30/60fps, grab native 4K/1080p thumbnails as PNG/JPG/WebP, and download individually or bundled as a ZIP.

100% In-Browser No Server Storage Instant Results

Extract Native 4K / HD Frames from Multi-GB Video Files Instantly

Reads MP4, MOV, WebM directly from local disk via Object URL — handles 4GB+ videos without uploading a single byte.

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How It Works Under the Hood

The browser streams local video bytes via Blob URL directly into an HTML5 <video> element at native resolution, letting Canvas snapshot exact decoded frames at videoWidth × videoHeight pixels without server transfer.

Step-by-Step Instructions

1

Select any local MP4, MOV, or WebM video (or click Load Sample Motion Clip to test).

2

Scrub the timeline or click -1 Frame / +1 Frame to pinpoint the exact moment.

3

Click Grab Current Frame to save full-resolution stills or export your gallery as a ZIP.

Key Features & Performance

  • Handles Multi-GB Video Files Instantly: Reads straight from local storage without copying files into memory
  • Native Original Resolution: Captures 4K/3840×2160 stills pixel-for-pixel without viewport scaling loss
  • Precision Frame Stepping: Supports 24fps, 30fps, and 60fps micro-stepping
  • Batch ZIP Download: Grab multiple candidate YouTube/TikTok thumbnails and export all at once

Local Browser Processing & Privacy

Traditional web converters upload your documents, snippets, or media files to remote servers. Video Frame Extractor & 4K Thumbnail Grabber runs inside your browser tab:

Processed in This Tab

Your input text and files are processed locally without uploading payloads to a processing server.

No Tool Payload Logging

Microdeck does not log or store the files or inputs you paste into tool workspaces (normal static hosting/CDN requests still load page assets).

Tab Memory Lifecycle

Working outputs stay in your browser tab and are released when you reset the tool or close the tab.

Frequently Asked Questions

Is there a file size limit for MP4/MOV videos?

No. Because videos are read via local Object URL rather than uploaded or buffered completely into JS arrays, even 4GB+ 4K recordings open immediately.

Why did my MOV video fail to show video frames in Chrome?

Some iPhone HEVC/ProRes MOV codecs require Safari/macOS hardware decoding or standard H.264/MP4/WebM containers supported by your browser.

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