HEIF to MTS Converter

Convert HEIF to MTS: What This Tutorial Covers

This walk-through is for anyone who has to drop a photograph into an AVCHD project — a Sony or Panasonic camcorder timeline, a disc-authoring job, or an editor whose import filter only lists .MTS — and has discovered it will not take a still image directly. A HEIF is one photo, so what comes out is a silent, motionless clip that holds that photo for a duration you set, written as an H.264 transport stream. By the end you will know how to size the clip so it matches your footage, what a .MTS file really is, and why some editors still refuse to import a loose one.

How to Convert HEIF to MTS

1. Upload Your HEIF File: Drag and drop your .heif photo onto the page or click "+ Add Files". Queue as many as you like — Merge strategy joins them into one clip on "Merge images" or writes one file each on "Video per image".
2. Set Image Duration: The Image Duration dropdown starts on "5 seconds per frame" and runs from a single frame at 1/60s up to 10 seconds per frame. That value is the clip length.
3. Set Video Resolution and Background Color: Move Video resolution off "Keep original" to 1920 x 1080 or 1280 x 720 so the clip matches the rest of your AVCHD footage. Background Color (White by default, with Black and 23 other named colours available) fills the bars left when the photo's shape does not fit that frame.
4. Convert and Download: Click "Convert" and save the .MTS. No sign-up, no watermark.

Walk-through: Matching the Clip to an AVCHD Timeline

Set the frame size deliberately. AVCHD is an HD format — 1080i, 720p, and progressive 1080p added by the 2011 revision of the specification. Left on "Keep original", the converter builds the video frame from your photo's own pixel dimensions, so a 4032 x 3024 iPhone photo becomes a 4032 x 3024 transport stream. That is far outside anything an AVCHD device or editor expects. Pick the frame size your camcorder footage already uses and the clip drops onto the timeline without a conversion warning.

Leave the codec on H.264. The Video Codec control in the advanced options also offers H.265, MPEG-1, MPEG-2, MPEG-4, Xvid and DivX, but AVCHD is specified around H.264/MPEG-4 AVC. Anything else produces a transport stream that AVCHD-aware software may refuse outright, and gains you nothing.

Expect the clip to be silent. A photograph carries no audio, so no audio stream is written — not even a silent one. A genuine camcorder .MTS carries Dolby AC-3 or linear PCM, and a few authoring tools assume every asset has an audio track, so add one on the timeline if yours complains.

Match the duration to the gap you are filling. Five seconds is the default and reads well for a title card or an establishing still. The sub-second options exist for producing one frame at a chosen frame rate, which is rarely what you want for a held photo.

MTS / AVCHD at a Glance

Camcorder MTS vs What This Converter Writes

Common Errors and How to Fix Them

• "My editor will not import the .MTS." Many AVCHD-aware editors expect the clip inside an AVCHD/BDMV/STREAM/ folder hierarchy rather than as a loose file. Some import a bare stream happily; others need the surrounding structure, which tools such as multiAVCHD or tsMuxeR can build around your clip.
• "There is no sound." By design. A still image has no audio track to encode, so nothing is written. Add music or narration on the timeline.
• "The clip is a strange size and the timeline wants to conform it." You left Video resolution on "Keep original", so the frame matched the photo instead of your footage. Re-convert with a fixed 1920 x 1080 or 1280 x 720.
• "The photo looks soft next to the original." A 1080p frame is about 2 megapixels and a modern phone photo is 12 or more, so the downscale discards most of the detail. That is a limit of HD video, not of the conversion — keep the picture as an image with HEIF to JPG if you need it sharp.
• "There are white bars around the picture." The photo's aspect ratio does not match the frame you chose, and the leftover space is filled with the Background Color. Black usually blends better with camcorder footage and is in the same dropdown.

When This Doesn't Work

MTS is worth targeting only when something specifically demands it. If the clip is going to a phone, a modern editor, a TV or the web, HEIF to MP4 carries the same H.264 video in a smaller, far more widely playable file. If you only ever wanted a viewable copy of the photo, keep it an image with HEIF to JPG. And if you already have camcorder footage that needs modernising rather than a photo that needs converting, MTS to MP4 is the tool for that direction.

Frequently Asked Questions

Is .MTS the same thing as .m2ts?

No — same video, different packaging. Camcorder media use the .MTS spelling and computers and Blu-ray discs use .m2ts, and the extension a converter writes decides the framing: the .MTS here is a plain MPEG-2 transport stream of 188-byte packets starting with the 0x47 sync byte, while HEIF to M2TS writes BDAV 192-byte packets that each add a 4-byte timestamp header, producing a slightly larger file. If a piece of software wants one spelling, convert to it — renaming the file changes the label but not the packets inside.

Is what I download here a complete AVCHD card?

No, it is a single bare stream. A real AVCHD volume stores clips inside AVCHD/BDMV/STREAM/ alongside clip-information and playlist files that tell the camera and player how the recordings fit together. Copying this .MTS onto an SD card will not produce a browsable AVCHD volume — a tool like multiAVCHD or tsMuxeR builds that structure around the clip.

Why does the output use H.264 when HEIF stores HEVC?

Because AVCHD is specified around H.264/MPEG-4 AVC, so that is what AVCHD editors and hardware expect. HEIF stores HEVC (H.265) picture data; both come from the MPEG family, but they are not interchangeable inside this container. The converter decodes the still from HEVC and re-encodes it as H.264 — there is no shortcut that reuses the original stream, just a clean single-frame encode.

Will this animate my photo or just freeze it?

It freezes it. Each photo becomes one motionless frame held for the duration you set, so the clip plays as a static image with no movement and no sound — which is exactly what you want for a slate, a title card or an inserted still. Uploading several photos with "Merge images" joins them back to back as hard cuts; there are no transitions or cross-fades.

Can I set a specific frame rate for the clip?

Not directly, and for a held still it rarely matters — every frame is identical, so the only thing frame rate changes is how many duplicate frames get encoded. What matters is that the frame size matches your project. If your editor is strict about frame rate on import, conform the clip on the timeline, which costs nothing visually for a static image.

Why is my file bigger or smaller than a camcorder clip of the same length?

Because a camcorder records real motion at a constant bitrate — typically in the 17 to 24 Mbps range for AVCHD 1080 material — while this clip is one unchanging image. There is almost nothing for the encoder to describe after the first frame, so a five-second still costs a small fraction of five seconds of live footage.

Does this page accept the .heic photos an iPhone saves?

This page is wired to the .heif extension. HEIC is the same HEIF container (ISO/IEC 23008-12) with HEVC-coded picture data inside, so the underlying format is effectively identical and only the extension differs. If your files are .heic, use HEIC to MTS instead — the encode that comes out is the same.

What happens to my photo after the conversion?

It is uploaded over an encrypted connection, converted on our servers, and both the upload and the finished .MTS are deleted automatically a few hours later. There is no sign-up and no watermark, and files are never shared or made public. On a big batch the practical constraint is upload time rather than anything in the encode.