Step 1: Upload your MKV files using the button above or by drag and drop.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Download your converted WebP files.
MKV to WebP Conversion FAQ
How do I extract images from a MKV video as WebP?
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Upload your MKV video. PDF.to pulls frames out at the rate you pick and gives you a ZIP of WebP stills.
How many frames will I get from the MKV?
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By default, one frame per second of MKV runtime. The options panel lets you pick every frame, one per 5 seconds, only key-frames, or a custom interval.
What resolution will the extracted WebP images have?
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Source resolution. A 1080p MKV produces 1920×1080 WebP stills; a 4K source produces 3840×2160 stills. Downscale in the options panel if needed.
Can I extract a single frame at a specific timestamp?
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Yes. Use the timestamp picker on the upload preview to scrub to the exact moment, then click 'extract this frame as WebP'.
Is the frame extraction lossy?
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Each frame is decoded from the MKV (lossless) and re-encoded as WebP. If WebP is lossless (PNG), no quality is lost. If WebP is JPG, we use high quality (90) by default.
Will the WebP stills be timestamped or numbered?
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Yes — file names are zero-padded sequence numbers (WebP_00001.WebP, WebP_00002.WebP, ...) so they sort correctly. The options panel can also embed the source timecode in EXIF.
Can I make a contact-sheet or thumbnail grid from the MKV?
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Yes — pick the 'contact sheet' option to get a single WebP containing a grid of thumbnails, useful for storyboarding or video previews.
How large can my MKV video be?
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100 MB on the free plan, 5 GB on PRO. Frame extraction is fast even for long videos.
Is the MKV to WebP extraction free?
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Yes for files under 100 MB. PRO unlocks larger files, higher extraction rates, and parallel processing.
Does PDF.to keep my MKV or extracted WebP files?
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No. Both the source MKV and the WebP output ZIP are deleted within an hour. Conversion runs in an isolated worker.
Can I extract images only from a section of the MKV?
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Yes. Use the trim controls to set start and end times, and only the selected range produces WebP frames.
What if my MKV has variable frame rate?
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We normalize to a constant frame rate internally before extraction, so the WebP stills are spaced evenly in time regardless of how the source was encoded.