Convert WEBM to APNG Online

Convert WebM to APNG Online — Free, No Watermark

Turn a WebM video into an animated PNG (APNG) that loops automatically and keeps full 24-bit color with smooth per-pixel alpha transparency — the thing a GIF can't do. This is the right conversion when your WebM has a transparent background or fine gradients and you need a lossless animation that still falls back to a clean static image in any viewer. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours — no sign-up, no watermark.

How to Convert WebM to APNG

1. Upload Your WebM File: Drag and drop or click "Add Files" to select a WebM video. Browser screen recordings, OBS clips, and WebM files exported from design tools all work. Batch conversion is supported.
2. Set the Frame Rate: Open the FRAMERATE dropdown and pick a rate from 1-50 FPS. 10 FPS is the recommended default for shareable loops; raise it to 15-20 FPS for smoother motion, knowing each extra frame adds to the file because APNG stores frames losslessly.
3. Adjust Resolution, Colors, and Quality: Use Image resolution to keep the original size, scale by percentage, or set a custom width/height. Leave Colors on "Original" to preserve full RGBA; choose "By Color Reduction + Dither" only when you need a smaller file. The Image quality (%) slider trades detail for size.
4. Convert and Download: Click Convert and download the APNG. No sign-up, no watermark.

APNG vs GIF vs Animated WebP — What You're Choosing

APNG is the only one of the three that keeps full color and soft alpha edges and degrades gracefully to a static PNG in old software. The trade-off is size: because APNG is lossless, the output can be larger than the source WebM and often larger than a tuned GIF. If file size is the priority and you don't need lossless quality, convert WebM to animated WebP instead.

Frequently Asked Questions

Why is my APNG larger than the WebM I started with?

WebM (VP8/VP9) uses inter-frame compression — each frame is stored as the difference from the previous one — and can be lossy. APNG is a sequence of losslessly compressed PNG frames, so it preserves every pixel exactly but cannot match WebM's compression ratio. A few seconds of full-resolution video can easily produce a larger APNG. To shrink it, lower the frame rate to 10 FPS, reduce the resolution, or run the result through compress APNG. Our pipeline already optimizes the output with Zopfli compression, which trims size further without touching quality.

Does the APNG keep the transparent background from my WebM?

Yes. WebM encoded with VP9 can carry a full alpha channel, and APNG preserves it as true 8-bit per-pixel transparency — the same soft, antialiased edges, not the hard on/off cutout you get with GIF. Leave Colors set to "Original" to avoid quantizing the alpha. This is the main reason to pick APNG over GIF for logos, stickers, and overlays.

What frame rate should I use for a WebM to APNG conversion?

10 FPS is the recommended starting point and keeps the file manageable. Go to 15-20 FPS for visibly smoother motion in fast clips, but remember APNG adds the full weight of each extra frame because there's no lossy inter-frame compression. For slow UI demos or subtle loops, 8-10 FPS reads fine and produces a noticeably smaller file. In our testing, a 3-second 480px clip dropped from roughly 2.1 MB at 24 FPS to about 0.9 MB at 10 FPS with no meaningful loss in readability.

Which browsers and apps can display an APNG?

APNG animates in Chrome 59+, Firefox 3+, Safari 8+, Edge 79+, and Opera 46+ — about 94% of global browser traffic per caniuse. Its standout feature is the fallback: anything that doesn't understand APNG, including older software and many image thumbnails, simply shows the first frame as a normal static PNG instead of a broken image. APNG was elevated to a formal W3C Recommendation as part of the PNG Third Edition on 24 June 2025.

Should I convert to APNG, GIF, or WebP?

Choose APNG for a lossless loop that needs smooth transparency and a clean static fallback. Choose GIF for the broadest possible compatibility in legacy chat apps and email clients — convert WebM to GIF for that, accepting a 256-color limit. Choose animated WebP when the smallest file wins and you're targeting modern browsers. APNG sits in the middle: better quality than GIF, larger than WebP.

Can I trim my WebM before converting to keep the APNG small?

Yes, and it's the most effective way to control size. Because APNG weight scales directly with duration and frame count, a shorter clip is a smaller file. Trim the WebM down to just the seconds you need with the WebM cutter first, then convert the trimmed clip to APNG.

Can I batch convert multiple WebM files to APNG at once?

Yes — drop in as many WebM files as you want and they convert in parallel on our servers. Download each APNG individually or grab them all as a ZIP. Your frame rate, resolution, and color settings can apply to every file or be adjusted per file.