WebP to MKV Converter

How to Convert WebP to MKV Online

1. Upload Your WebP Files: Drag and drop or click "Add Files" to select one or more .webp images. Batch upload is supported, and both static WebP and animated WebP (multi-frame ANMF/ANIM chunks) are accepted.
2. Pick Merge Strategy and Quality Preset: Default is "Merge images" with the Very High (Recommended) quality preset. Switch to "Video per image" to output one MKV per file. Under File Compression you can choose Quality Preset (Highest through Lowest), Constant Quality (CRF), or Constraint Quality — bitrate and file-size targeting modes don't appear for image sources. The default video codec is H.264 with AAC audio; H.265, VP9, AV1, and lossless options are all available.
3. Set Duration, Background Color and Resolution (Optional): Under Duration choose how long each frame holds — from 1/60s (60 fps time-lapse) through 1/30s, 1/24s, 0.1s, half a second, up to 10 seconds per frame. Background Color (White by default, plus Black, Gray, Navy and 20+ named colors) is the color transparent WebP areas are composited onto, and it also fills letterbox bars when source images don't match the output aspect. Video Resolution offers Keep original, fixed presets (4K UHD 3840×2160, 1440p, 1080p, 720p, 480p, vertical 1080×1920 and square 1080×1080), or a custom Width × Height.
4. Convert and Download: Click Convert. Each WebP is decoded, scaled to the output canvas, and muxed into the Matroska container with the chosen codec. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

Why Convert WebP to MKV?

WebP is Google's image format (released 2010), capable of static and animated content using VP8/VP8L compression inside a RIFF container with VP8X, ANIM and ANMF chunks. Matroska (MKV) is an open container that wraps virtually any codec — H.264, H.265/HEVC, VP9, AV1, AAC, Opus, FLAC — plus multiple audio tracks, subtitle tracks, and chapter markers. Turning a folder of WebPs into an MKV gives you a single playable file that home-theater software treats as first-class media.

• Photo slideshows for Plex, Jellyfin and Kodi — these servers index MKV reliably and let you scrub, chapter-skip and cast to a TV. Static WebP isn't a library citizen in any of them; MKV is.
• Time-lapse from sequential captures — security cameras, dashcams, and trail cams that export WebP burst frames can be stitched into a smooth 24, 30 or 60 fps timeline. Set Duration to 1/24s, 1/30s or 1/60s for one image per frame.
• Animated WebP rescue — many media players (VLC older builds, MPC-HC, smart TVs, DLNA boxes) won't play animated WebP at all. Re-encoding to H.264 inside MKV gives you a universally playable file that preserves the motion.
• Archival masters — MKV's lossless mode (FFV1, HuffYUV) and per-track metadata make it the format of choice for libraries and archivists; the Library of Congress lists Matroska in its sustainability-of-digital-formats catalog.
• Bypassing image-only platforms — uploading a stack of stills to YouTube, Vimeo or a CMS that only accepts video? An MKV slideshow is recognized; a .zip of WebPs isn't.
• Multi-language or commentary builds — MKV holds multiple audio tracks side by side, so a single photo-slideshow file can carry English narration and a music-only track without re-encoding.

WebP vs MKV — Source and Container Compared

Codec and Quality Preset Quick Guide

Frequently Asked Questions

Why is the Trim option hidden for WebP to MKV?

There's no source timeline to trim — your input is a stack of images, not an existing clip. Control the slideshow length two ways instead: change the number of WebPs you upload, and adjust Duration (1/60s up to 10 seconds per frame). Total runtime = images × duration.

Should I pick MKV or MP4 for a WebP slideshow?

MKV if the file will live on a Plex, Jellyfin or Kodi server, or you need multiple audio/subtitle tracks. MP4 for phones, web embeds, social uploads, and AirPlay. The same H.264+AAC payload works in either container, so quality is identical — only the wrapper differs. For maximum device reach use WebP to MP4 instead.

Can I convert an animated WebP into MKV with motion preserved?

Yes. Animated WebP frames (ANMF chunks) are decoded in order and re-timed to the Duration you pick. If the source uses variable per-frame timing, this converter resamples to a fixed frame rate — for most cartoon and meme animations the result is indistinguishable from the original. For a smaller GIF-style output see WebP to GIF.

How do I make a time-lapse from sequential WebP captures?

Upload the frames in filename order, leave Merge images selected, and set Duration to 1/24 second (cinematic 24 fps), 1/30 second (broadcast 30 fps) or 1/60 second (smooth 60 fps). A 1000-frame capture at 1/30s yields a ~33-second 30 fps MKV.

What background color should I use, and when does it show?

The Background Color (default White) shows in two places: any transparent areas of your WebPs are composited onto it during encoding, and it fills the bars when your WebPs don't match the chosen output aspect ratio — for example, mixing portrait phone shots into a 16:9 1080p timeline produces vertical pillarbox bars. The White default suits printed-photo slideshows; pick Black for cinematic feel, or a brand color for corporate decks.

Will the MKV play on a smart TV or Chromecast?

Most modern smart TVs (LG webOS, Samsung Tizen, Android TV) play H.264-in-MKV directly from USB or DLNA. Chromecast supports H.264 and VP9 in MKV via apps like VLC Mobile and Plex; native Chromecast doesn't accept raw MKV from a browser tab — cast through Plex or a Jellyfin app for full compatibility.

How big will the output MKV be?

Roughly: minutes × bitrate ÷ 8 = megabytes. The Very High preset targets around 8 Mbps at 1080p, so a 60-second slideshow lands near 60 MB. To land under a strict upload cap, shorten each frame's Duration, pick a smaller resolution, or lower the preset — file-size targeting modes don't appear for image sources. For shrinking an existing MKV afterwards use Compress MKV.

Does MKV support transparency from my WebP alpha channel?

Standard H.264, H.265, VP9 in MKV do not carry alpha — the image is flattened, with transparent areas composited onto the Background Color option (white by default; pick any color from the dropdown), and semi-transparent edges blend smoothly into that color instead of fringing. If preserving transparency matters, keep the source as animated WebP.

Are my files private?

Yes. Conversion runs on our servers; WebPs are uploaded to convert, the resulting MKV is delivered to you, and temporary files are deleted automatically after a few hours. No account is needed and no watermark is added.