Step 1: Supply your AVI files using the button above or by haul and lay.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Get your converted WebM files.
AVI to WebM Conversion FAQ
What does the AVI to WEBM converter do?
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AVI is a legacy container, often poorly supported on modern devices. Converting to WEBM rewraps the video with a current codec (H.264 / H.265 / VP9) for broad browser, phone, and TV compatibility.
Will resolution and frame rate be preserved in the WEBM?
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Yes. AVI → WEBM keeps resolution, frame rate, and aspect ratio unchanged by default. To change them, use the Resize or Speed tool on the result.
Will the AVI play smoothly on modern devices after converting to WEBM?
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Yes. Legacy AVI files often fail to play in modern browsers and on iOS / Android. WEBM uses widely supported codecs that play natively on phones, tablets, smart TVs, and every modern browser.
Will the converted WEBM be a different size than the AVI?
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Modern codecs compress better, so WEBM from a legacy AVI is typically 30-60% smaller at equivalent quality. Conversions in the opposite direction can grow the file.
My AVI footage shows comb lines on movement — will that carry into the WEBM?
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It will unless you deinterlace, and AVI content very often is interlaced because the format comes from the broadcast and DVD era. Interlaced frames store two half-height fields captured a fiftieth of a second apart; on a progressive-scan phone or monitor that reads as horizontal combing on anything that moves. Turn on the deinterlace option and the encoder weaves the fields into whole progressive frames before writing the WEBM. AVI is Microsoft’s Audio Video Interleave, introduced in 1992 on top of the RIFF chunk format — one of the oldest containers still in circulation.
My AVI recordings are split into numbered parts — does WEBM have the same limit?
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No, and that is one of the better reasons to move. The AVI container has a practical single-file ceiling that long or high-bitrate recordings run straight into, which is exactly why old captures arrive as part1, part2, part3. WEBM has no equivalent limit, so the pieces can be rejoined into one continuous file. AVI has no native support for modern codecs, variable frame rate, soft subtitles or files over 4 GB without hacks, and its per-chunk overhead bloats the file.
Can I add selectable subtitles once the file is WEBM?
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Yes. AVI has no usable soft-subtitle track, so subtitles for AVI content had to be burned into the picture or shipped as a separate sidecar file. WEBM carries subtitles as their own selectable stream, so after conversion you can attach an SRT track the viewer can switch on, switch off or restyle. WebM is deliberately narrow: VP8 or VP9 video (AV1 more recently) with Vorbis or Opus audio, and nothing else.
Is WEBM worth targeting for a video on a web page?
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For a page you control, yes. WEBM was built for exactly that job — it plays inline in every current browser with no plugin, no licence fee and no patent exposure, which is why it became the default for embedded and background video. Away from the browser it is the weaker choice: editing software, phone galleries and televisions largely ignore it, so it is a delivery format rather than a storage one. Keep the master in something else and publish this. WebM plays natively in every modern browser with no plugin, no licence fee and no patent exposure, which makes it the default for web-embedded video.
My AVI has several audio tracks — do they all survive into the WEBM?
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Not dependably. AVI stores multiple audio streams as first-class tracks, but WEBM playback support past the first track is inconsistent, so most players will only ever expose one. Choose the track you actually want before converting; the others are better extracted to their own files than left in a container that hides them. AVI is trivially simple, which is exactly why ancient camcorders, capture cards, DVD ripping tools and Windows-era software all still emit it. WebM is a poor fit anywhere outside a browser — video editors, phones’ native galleries and Smart TVs largely ignore it.
These AVI files came off an old camcorder — is anything special needed?
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Two things, both worth setting before you start. Tape-era cameras recorded interlaced fields and at a frame rate tied to the mains frequency where the camera was sold, so leaving deinterlacing off bakes comb lines into the WEBM permanently, and letting the converter guess the rate can introduce a subtle judder on panning shots. Set both explicitly and the transfer is otherwise clean — the picture is what the tape held, which is the ceiling regardless of what it is converted into.
Is there a file-size limit when converting AVI to WEBM?
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Anonymous uploads are capped at a generous default; signed-in free accounts get a higher cap, and Pro accounts have no per-file limit. Browser memory is usually the practical constraint long before our server-side limits kick in.
Can I batch-convert several AVI files to WEBM at once?
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Yes. Drop or pick multiple AVI files in one upload — the converter processes them in parallel and returns a ZIP of the WEBM results. There is no need to repeat the upload step per file.
