HEIF to AV1 Converter

Convert HEIF to AV1: What This Tool Actually Produces

A HEIF file is a single still image — one HEVC-encoded picture inside an ISO container — and AV1 is a video codec, so this conversion turns your photo into a short, motionless, silent AV1 video clip. The image is rendered and held on screen as one frame for a duration you choose, then encoded with AV1 (the royalty-free AOMedia codec) inside an MP4-style container. This walk-through is for anyone who specifically needs an AV1 video out of a still photo — and it also clears up the very common mix-up between AV1 video and AVIF, the AV1-based image format most people are actually looking for.

How to Convert HEIF to AV1

1. Upload Your HEIF File: Drag and drop your .heif file onto the page, or click "+ Add Files". Add several at once if you want either one clip per image or a single combined clip.
2. Set the Duration: Open Advanced Options and use the Duration control to choose how long the still is shown — the default is 5 seconds per frame, adjustable from a single frame up to 10 seconds.
3. Pick Background Color and Quality (Optional): Background Color (default Black) fills any letterbox area when the photo's aspect ratio doesn't match the output frame, and the File Compression preset (default "Very High (Recommended)") controls how finely AV1 encodes the picture.
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.

Walk-through: Duration, Resolution, and the AVIF Question

A HEIF still has no inherent runtime, so the Duration setting decides the entire clip length — it is the single most important control on this page. The same control doubles as the effective frame rate when you pick a fractional value:

• For a normal "photo on a timeline" clip: leave it on a whole number of seconds. 5 seconds is the default; pick 2-10 seconds depending on how long you want the image to linger.
• For a single freeze-frame: choose a fractional option such as 1/24s, 1/30s, or 1/60s. These produce one frame at that frame rate — useful when an editor expects a one-frame clip rather than a multi-second hold.
• If you uploaded several images: the Merge strategy control takes over. "Merge images" strings every photo into one AV1 clip, each held for the duration you set (a basic slideshow); "Video per image" outputs a separate clip for each file.
• Watch the resolution. Leave Video resolution on "Keep original" to preserve the photo's native size; only choose a Fixed Resolution if your project needs a specific frame, since upscaling a smaller photo adds no real detail.

The single most important thing to know before you start: AV1 is a video codec, not an image format. If you wanted a smaller, sharper picture — not a clip — you almost certainly want AVIF, the AV1 Image File Format, which is essentially one AV1-encoded frame saved as a still. AVIF even uses the same ISO container family as HEIF, supports alpha transparency and HDR, and is roughly 50% smaller than JPEG. For that, use HEIF to AVIF instead. HEIF to AV1 video only makes sense when you genuinely need a video file.

Common Errors and How to Fix Them

• "My clip has no sound." That is expected. A HEIF still carries no audio track, so the AV1 output is silent by design. To add a soundtrack, import the clip into a video editor such as Shotcut or DaVinci Resolve and add audio there.
• "The encode took a while." AV1 is a computationally heavy codec — its encoder does far more work per frame than H.264 to reach its higher compression, so even a single-image clip is slower to produce. The trade-off is a smaller file at the same quality.
• "The image looks letterboxed or has black bars." The photo's aspect ratio doesn't match the output frame, so the gap is filled with the Background Color. Match the Video resolution to your project (or keep the original dimensions), or change the Background Color from Black to White.
• "My older device or app won't play the file." AV1 decoding needs a recent browser or chip. Chrome 70+, Firefox 67+, and Edge 121+ decode it; Safari supports AV1 only from version 17 and leans on hardware decoding. Older hardware falls back to slow software playback.
• "The colors look slightly off versus the original." HEIF can store 10-bit color; if your output path or player handles only 8-bit, a wide-gamut photo is mapped down during encoding.

When This Doesn't Work

If you actually wanted a still image — to view, share, store, or place on a web page — AV1 video is the wrong target. Use HEIF to AVIF for the AV1-based image format (smaller than JPEG, with transparency and HDR), or HEIF to JPG for a universally compatible photo that opens anywhere. HEIF to AV1 video only makes sense when you specifically need a video file: a placeholder or logo clip on an editing timeline, a stand-in frame in a modern codec-conscious pipeline, or a tiny silent loop to replace a heavy GIF. If you need the broadest device compatibility for a video instead, HEIF to MP4 uses H.264 and plays almost everywhere; AV1 is the right pick only when small file size at high quality matters more than reaching every old player.

Frequently Asked Questions

Did I want AVIF instead of AV1 video?

Quite possibly. AVIF (AV1 Image File Format) is a still image built on the AV1 codec — essentially one AV1 frame saved as a picture — and it uses the same ISO container family as HEIF, with alpha transparency, HDR support, and files around 50% smaller than JPEG. AV1, by contrast, is a video codec, so converting HEIF to AV1 produces a short silent video clip, not an image. If you wanted a smaller, sharper version of the photo, use HEIF to AVIF. If you genuinely need a video file, HEIF to AV1 is correct.

Why is my HEIF to AV1 clip silent?

Because a photo has no sound. HEIF to AV1 is a still-image-to-video conversion: it renders one picture as video frames with no audio source to draw from, so the output is silent by design. If you need audio, open the resulting clip in a video editor such as Shotcut or DaVinci Resolve and add a music or voiceover track there.

What exactly is a HEIF file, and why convert it to AV1 video?

HEIF (High Efficiency Image File Format, ISO/IEC 23008-12) is a still-image container built on the ISO Base Media File Format, holding an HEVC-encoded picture at roughly half the size of an equivalent JPEG — the format iPhones save photos in. People convert it to AV1 video for a niche reason: dropping a still onto a video timeline as a placeholder or logo clip, or producing a tiny silent loop to replace a heavy animated GIF, where AV1's efficiency keeps the file very small.

Will every device play an AV1 file?

Not every device. AV1 decoding is supported in Chrome 70+, Firefox 67+, and Edge 121+, while Safari added it from version 17 and depends on hardware support. On older hardware playback falls back to slower software decoding. If broad compatibility matters more than file size, use HEIF to MP4, which uses H.264 and plays almost everywhere.

How long can the clip be, and what if I upload several photos?

The Duration control runs from a single frame (fractions like 1/60s) up to 10 seconds per image. If you upload multiple HEIF files and choose "Merge images," they play in upload-list order, each held for the duration you set — so ten photos at 5 seconds each yields a roughly 50-second slideshow. Choose "Video per image" instead to get a separate AV1 clip for every file.

Will the AV1 clip look as sharp as the original HEIF?

Close, at sensible settings. AV1 is a very efficient modern codec, so a still encoded at the "Very High" preset stays visually clean. In our testing, a single sharp photo held for 5 seconds on the default preset produced an AV1 clip well under a megabyte — far smaller than the equivalent MPEG output, though slower to encode. Keep the resolution at the photo's native size rather than upscaling, since stretching a smaller image past its real detail is what causes softness, not the codec.