ICO to MJPEG Converter

ICO to MJPEG — and Whether MJPEG Is What You Need

Motion JPEG stores every frame as a complete, independent JPEG. Nothing is predicted from the frame before it, which makes MJPEG trivially seekable and trivially large. Converting a Windows icon to MJPEG produces a short silent clip of one held frame, and it is worth knowing before you start that a .mjpeg file is a raw stream rather than a packaged video: it has no container, no duration metadata, and no place to put audio. If your target is a timeline, a capture pipeline, or a device that ingests JPEG frames, that is exactly right. If it is anything else, MP4 is the better answer.

MJPEG vs H.264 — Side by Side

When to Pick MJPEG

• A capture card, machine-vision rig, or IP-camera toolchain expects a stream of JPEG frames and will not accept a predicted codec.
• You need every frame independently decodable — frame-accurate scrubbing, per-frame analysis, or lossy-but-simple archival where a corrupt byte costs you one frame instead of a whole group of pictures.
• The decoding hardware is old or minimal. A JPEG decoder is far simpler than an H.264 one, which is why MJPEG persisted in embedded devices long after better codecs existed.
• A downstream tool explicitly names Motion JPEG in its input list.

When to Pick MP4 Instead

• You want to share, upload, or embed the clip. Browsers, phones and social platforms take H.264 in MP4; almost none of them take a raw MJPEG stream.
• File size matters. On the same content MJPEG is typically two to three times larger, and the gap widens with longer clips and real motion.
• You need audio, chapters, or reliable duration reporting — a raw elementary stream carries none of these.
• Try ICO to MP4 for that route; it runs the same still-image pipeline with H.264.

What a .mjpeg File Actually Is Here

How to Convert ICO to MJPEG

1. Upload Your ICO File: Drag and drop the .ico onto the page or click "+ Add Files". Several icons can be queued and converted with one set of options.
2. Set the Duration: Under Advanced Options the Image Duration control is preselected at "5 seconds per frame" and ranges from a single frame up to 10 seconds per frame.
3. Set quality with Constant Quality, not the preset: MJPEG has no constant-rate-factor mode, so switch File Compression to "Constant Quality" and use the slider — lower values mean a finer JPEG quantiser and a bigger file, and it starts at 5. Video resolution and Background Color (White by default) sit in the same panel.
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.

Frequently Asked Questions

Why does my player show no duration or seek bar for the .mjpeg file?

Because there is no container to record one. The file is a raw elementary stream — literally one JPEG after another — and timing lives in containers, not in the stream. VLC and mpv will still play it, but scrubbing and the length readout depend on the player guessing. Wrapping the same codec in AVI or MOV restores proper timing.

Why is the MJPEG larger than the MP4 of the same icon?

Because nothing is shared between frames. H.264 encodes five identical frames as one picture plus four near-empty updates; MJPEG encodes five complete JPEGs. Motion JPEG generally reaches around 1:20 compression where inter-frame codecs reach 1:50 or better, and with a static source the gap is at its widest.

Does changing the Quality Preset do anything on this page?

Not for MJPEG. The preset system is built around constant-rate-factor encoding, which MJPEG does not implement — its quality knob is the JPEG quantiser scale instead. Select the "Constant Quality" compression mode to control it directly; leaving the page on the default preset gives a mid-range quantiser.

Is there an official Motion JPEG standard I can point a vendor at?

Not a single one. There is no document defining one universally recognised Motion JPEG file format. What does exist is format-specific: Microsoft documents M-JPEG inside AVI, Apple specifies it for QuickTime, and RFC 2435 defines the payload for RTP streaming. When a vendor says "MJPEG", ask which of those they mean.

Can I put audio in the MJPEG file?

No, on two counts. The raw stream we write has nowhere to carry an audio track, and an ICO file contains no audio to carry in the first place. Convert to AVI or MOV with MJPEG selected as the codec if you need a soundtrack alongside Motion JPEG video.

Why does the icon look blocky in the clip?

Because ICO artwork is small. A standard icon directory entry stores each dimension in one byte, where 0 means 256, so 256 x 256 is the largest image a normal entry can describe, and 16 to 64 pixels is far more usual. Any upscaling stretches the pixels that exist. Leave Video resolution on "Keep original" for a faithful frame.

Which image from a multi-size ICO ends up in the video?

The first entry in the directory. The decoder takes entry zero rather than searching for the largest, and different icon editors order their entries differently. If the clip comes out at 16 x 16 despite the icon containing a 256 px version, re-save the .ico with only the size you need.

What actually plays a raw MJPEG stream?

VLC, mpv, ffplay and most non-linear editors handle it. Web browsers, phones and TVs generally do not, and neither do most upload forms. That asymmetry is the main practical reason to prefer AVI, MOV or MP4 unless a specific tool has asked for the raw stream.

What happens to my uploaded icon?

It is sent over an encrypted connection, converted on our servers, and both the upload and the finished stream are deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public.