WebP to AV1 Converter

How to Convert WebP to AV1 Online

1. Upload Your WebP Files: Drag and drop or click "+ Add Files" to select one or more .webp images — animated or static. Batch upload is supported.
2. Pick Merge Strategy and Quality Preset: Choose "Merge images" to splice all frames into one AV1 video, or "Video per image" to render each WebP as its own clip. Set Quality Preset (default "Very High"; options Lowest → Highest), or switch to Constant Quality / Constraint Quality for fine bitrate control.
3. Set Duration, Resolution, and Background (Optional): Duration controls seconds-per-image (default 5 s). Pick Original, a Fixed Resolution (720p, 1080p, 1440p, 2160p, 4320p), or a Preset Resolution (1920×1080, 1280×720, 3840×2160, vertical 1080×1920, etc.) — or type custom width/height. Change Background Color from Black if your WebP has transparency you want filled.
4. Convert and Download: Click "Convert". Each file processes in your browser session and downloads as a .mp4 container with the AV1 video stream — no watermark, no sign-up, no email gate.

Why Convert WebP to AV1?

WebP, announced by Google on 30 September 2010, supports both static and animated frames and uses the VP8 codec underneath. AV1 — finalized by the Alliance for Open Media on 28 March 2018 — is the modern royalty-free successor to VP9 and HEVC, delivering about 30% better compression than VP9 and HEVC at equivalent quality for 4K UHD. Converting WebP frames into an AV1 video unlocks longer playback, audio tracks, scrubbing, and far better delivery for streaming-style platforms.

• Repackage animated WebP marketing assets — animated WebPs from Shopify, Etsy, or product-tour exports often top 5–10 MB; re-encoding the frames as an AV1 video at the same resolution typically lands in the 1–3 MB range for short loops, which is friendlier for Reels, Shorts, and TikTok upload pipelines.
• Build slideshows from product photo sets — drop a folder of WebP product shots, set 3–5 seconds per image, choose 1080×1920 for vertical Reels or 1920×1080 for YouTube, and the output is a single playable AV1 video instead of a folder of stills.
• Archive sprite sheets and frame sequences — animation frames exported as numbered WebPs can be merged into one AV1 stream, which is roughly half the size of an equivalent H.264 MP4 at the same perceptual quality.
• Prep clips for YouTube and Netflix-style platforms — both serve AV1 natively today; YouTube has shipped AV1 since 2018 and uses it for 8K, and Netflix began streaming AV1 in February 2020 and reports AV1 made up roughly 30% of its streams by late 2025.
• Create web-embeddable hero loops — AV1 inside an MP4 container plays in Chrome 70+, Firefox 67+, and Edge 121+, covering well over 90% of global users on caniuse; pair with an MP4/H.264 fallback for Safari, which still has only partial AV1 decode.
• Cut Cloudflare R2 / S3 egress bills — smaller files mean fewer GB served. A 4 MB animated WebP that becomes a 1.2 MB AV1 video pays for itself the first thousand views.

WebP vs AV1 — Format Comparison

AV1 Quality Preset Cheat Sheet

Constant Quality holds CRF steady; Constraint Quality caps the bitrate ceiling so a single complex frame can't blow your file-size budget. For most users the default Very High preset is the right call.

Frequently Asked Questions

Will my animated WebP keep its motion after conversion?

Yes. Each frame in the animated WebP is decoded and re-encoded as a frame of the AV1 video, preserving the animation. The default 5-seconds-per-image setting only applies when you upload static WebPs as a slideshow — animated WebPs use their embedded frame timing.

Why does the output file have an .mp4 extension if the codec is AV1?

AV1 is a video codec, not a container. The default container here is MP4 (ISO Base Media File Format), which YouTube, browsers, and most editors expect. The video stream inside is AV1. If you need WebM or MKV containers, look at our sibling WebP to MP4 or WebP to Video tools.

Will the AV1 file play on iPhone and Safari?

Partially. Safari 17 on macOS and iOS added partial AV1 support, but full hardware decode landed only on iPhone 15 Pro / 15 Pro Max and later (A17 Pro chip) and Apple silicon Macs with M3 or newer. On older Apple hardware, expect software fallback at best or a "cannot play" error at worst. For broad compatibility, also produce an H.264 MP4 fallback.

Should I pick "Merge images" or "Video per image"?

Choose "Merge images" when your WebPs are sequential frames or a slideshow you want as a single playable video. Choose "Video per image" when each WebP is unrelated and you want one AV1 file per input — useful for batch-converting a folder of animated WebP product GIFs into individual MP4s.

How small will my AV1 video be compared to the source WebP?

For animated WebPs in the 5–10 MB range, AV1 output is typically 30–60% smaller at the default Very High preset because video codecs exploit inter-frame redundancy that the per-frame WebP encoder can't. For static WebP slideshows the comparison is less direct — a single 200 KB photo at 5 seconds will be perhaps 100–300 KB as AV1.

Why is AV1 encoding slower than H.264?

AV1 ships an order of magnitude more compression tools (more partition shapes, more reference frames, advanced loop filtering), so the encoder runs many more decisions per block. Quality Preset effectively trades encoder effort for output size — Lowest finishes fastest, Highest can take 5–10× longer than H.264 for the same clip. This is the same reason YouTube and Netflix pre-encode AV1 once and serve it forever.

Do my files leave the browser during conversion?

Files upload to the conversion endpoint for processing — AV1 encoding is too CPU-heavy to run reliably in a browser tab — and are deleted shortly after the download finishes. No sign-up, no account, no email is required, and there is no watermark on the output.

Can I add an audio track to the AV1 video?

Not in this tool — input is WebP, which carries no audio. To mux an AAC, MP3, or Opus track into the resulting MP4, run the output through a video editor or a separate merge step. If you start with a video that already has audio, use the dedicated AV1 to MP4 or WebP to Video endpoints which expose audio codec selection.

What resolution should I pick for social platforms?

For Instagram Reels, TikTok, and YouTube Shorts pick the 1080×1920 (vertical 9:16) Fixed Resolution. For YouTube main feed pick 1920×1080 (16:9 1080p) or 3840×2160 (4K) if your source frames are sharp enough. For Twitter/X embeds 1280×720 keeps file size in check while looking crisp on most timelines. Don't upscale beyond the source WebP resolution — AV1 will compress the upscale artifacts faithfully but they'll still look soft.