WebP to MJPEG Converter

How to Convert WebP to MJPEG Online

1. Upload Your WebP Files: Drag and drop or click "+ Add Files" to add one or more WebP images. Animated WebPs are accepted and unpacked frame-by-frame. Batch uploads run with shared settings.
2. Pick Merge Strategy and Image Duration: Choose "Merge images" to stitch every WebP into one MJPEG sequence, or "Video per image" to output one file per input. Default Image Duration is 5 seconds per frame — drop it to 1/24 second for true motion playback, or stay at 1-5 seconds for slideshows.
3. Set Quality Preset, Background Color and Video Resolution (Optional): Quality Preset is Constant Quality with a "Very High (Recommended)" preset; pick High or Medium for smaller files. Background Color (default Black) fills any letterboxing when input aspect ratios differ. Under Video resolution choose Keep original, a Fixed Resolution (1080P, 720P, 480P), a Preset Resolution (1920x1080, 1280x720, 3840x2160), or type a custom Width × Height.
4. Convert and Download: Click "Convert". 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 MJPEG?

WebP is Google's still and animated image format (announced September 2010, now supported by browsers covering ~96% of users). MJPEG (Motion JPEG) is a video codec where every frame is stored as a complete, independent JPEG — no inter-frame prediction, no GOP, no keyframe gaps. Wrapping WebP frames into an MJPEG stream gives you a video that any frame editor, dashcam analyzer, or surveillance NVR can scrub through with single-frame precision.

• Frame-accurate editing intermediates — Premiere Pro, DaVinci Resolve, Final Cut and Avid all decode MJPEG natively. Because every frame is a keyframe, cuts land exactly where you drop them with no GOP re-encoding penalty.
• Dashcam and IP-camera ingest — many low-end dashcams and machine-vision cameras still record MJPEG in AVI containers. Converting your WebP evidence stills into an MJPEG clip lets you splice them inline with native camera footage.
• Microscopy and IVD recordings — MJPEG is a long-standing default for fundus imaging, surgical capture and in-vitro diagnostic devices because per-frame quality is consistent and motion artifacts (ringing, ghosting from P/B-frame prediction) are absent.
• Game console and embedded playback — PlayStation, Nintendo Wii and older STBs ship MJPEG decoders; an MJPEG/AVI plays where H.264 or HEVC requires a license-fee codec the device may not ship.
• HTTP push streaming — multipart/x-mixed-replace MJPEG over HTTP is the simplest possible "live camera" feed, supported by Chrome, Firefox, Edge and Safari without extra players. Useful for prototypes, robots and lab dashboards.
• Archival of animated WebP — animated WebP support in old viewers is patchy. An MJPEG AVI plays in VLC, QuickTime, ffplay and Windows Media Player on any machine from 2005 onward.

WebP vs MJPEG — Format Comparison

MJPEG Quality Preset Guide

Sizes are typical for natural images; flat graphics and screenshots compress further. Even at Very High, MJPEG output is several times larger than H.264 in MP4 — that is the cost of frame-independence.

Frequently Asked Questions

Why is my MJPEG file so much bigger than the source WebP or an MP4 of the same clip?

MJPEG stores every frame as a full JPEG with no inter-frame compression, so a 30 fps clip is essentially 30 JPEGs per second. Modern codecs like H.264 only fully encode keyframes (typically every 1-10 seconds) and store the rest as deltas. Expect MJPEG files to be 5-20× the size of equivalent H.264 output, which is by design — the format trades size for frame independence and decode simplicity.

Will animated WebP frames map 1:1 into the MJPEG output?

Yes. Each ANIM chunk in the animated WebP becomes one JPEG frame in the MJPEG stream, in order. The per-frame display duration you set ("Image Duration") replaces the WebP's own ANIM delay — set it to 1/24, 1/30 or 1/60 second to get true motion playback at 24, 30 or 60 fps respectively.

What container does the output use, and can I rename it to.avi?

xconvert writes MJPEG into an .mjpeg raw stream by default. Most players (VLC, ffplay, MPV) auto-detect the codec. For Windows Media Player and many NLEs you'll want it in an AVI container — use MJPEG to AVI for a clean container swap with no re-encoding.

Does MJPEG support transparency since WebP does?

No. JPEG (and therefore MJPEG) has no alpha channel. Any transparent pixels in your WebP will be flattened against the "Background Color" you choose (default black). Pick white or a chroma-key green if you need to composite the result later, or keep the alpha by exporting to a format that supports it like WebP to MOV with a codec that carries alpha.

Which players and editors play MJPEG natively?

VLC, QuickTime Player, ffplay/MPV, Windows Media Player and most browsers (via multipart/x-mixed-replace). On the editor side: Adobe Premiere Pro, DaVinci Resolve, Final Cut Pro, Avid Media Composer and Vegas Pro all decode and timeline-scrub MJPEG without transcoding. That native support is the main reason editors still hand each other MJPEG dailies.

Can I trim or recut the result without re-encoding?

Yes — that's MJPEG's headline advantage. Because every frame is a keyframe, you can cut between any two frames losslessly. xconvert's MJPEG trimmer does this without re-quantizing the JPEG data, so your trimmed clip is bit-identical to the source on the surviving frames.

Is MJPEG a good choice for uploading to YouTube, Instagram or TikTok?

No. Those platforms re-encode everything to H.264/H.265 anyway, and they impose size and length caps (Instagram Reels accepts up to 4 GB; TikTok's mobile uploader caps around 287 MB on iOS while the web uploader allows several GB). An MJPEG file balloons quickly — even at modest resolutions, a one-minute clip easily exceeds 500 MB. For social uploads, convert your WebP frames straight to MP4 via WebP to MP4 and skip the MJPEG round-trip.

Will my dashcam or IP camera DVR accept an MJPEG file I made here?

Usually yes if the device records MJPEG/AVI itself — feed the file through MJPEG to AVI first and match the camera's frame rate (often 15, 25 or 30 fps). Some NVRs reject files whose internal stream metadata doesn't match the camera's recorded headers exactly; in that case import via the NVR's "external clip" workflow rather than placing the file directly in its storage folder.

What's the maximum upload size?

XConvert processes files on its servers and deletes them automatically after a few hours. For very large batches, split your input or use the "Video per image" merge strategy to avoid building one giant in-memory frame buffer.