SWF to WEBA Converter

How to Convert SWF to WEBA Online

1. Upload Your SWF File: Drag and drop the .swf file or click "+ Add Files" to browse. Multiple SWFs can be queued and batch-processed with the same settings.
2. Pick Audio Codec and Quality Preset: WEBA defaults to Opus (the only sensible choice — Vorbis is the legacy WebM alternative). Leave Quality Preset at "Very High (Recommended)" for music or step down to Medium/Low for speech and tutorial narration. For exact targets, switch to Constant Bitrate (8-384 kbps) or enter a Custom Bitrate.
3. Trim or Set Channels and Sample Rate (Optional): Use Trim to clip the start offset and duration in seconds — useful when the SWF intro contains a Flash logo sting you don't want. Audio Channel and Audio Sample Rate default to "Original"; override to mono / 48 kHz for voice-only material.
4. Convert and Download: Click "Convert". Files are processed on the server and downloaded directly — no sign-up, no watermark, no install.

Why Convert SWF to WEBA?

SWF (Small Web Format) was Adobe Flash's container for vector animation, ActionScript, and embedded audio. Adobe ended Flash support on December 31, 2020, and all major browsers pulled the plugin shortly after. The audio inside legacy SWFs — game music, e-learning narration, animation soundtracks — is usually encoded as MP3 or ADPCM (Flash's proprietary block-ADPCM variant) and is locked behind a runtime almost nothing plays anymore. WEBA (a WebM file holding only an audio track, almost always Opus) is the modern open-source replacement: royalty-free, smaller than MP3 at equal quality, and natively decodable by every current browser.

• Salvage e-learning narration from dead courseware — Articulate, Captivate, and Lectora SCORM packages from 2008-2019 baked audio into SWF shells. Extracting to WEBA/Opus lets you re-host the audio in HTML5 LMS players without a Flash runtime.
• Preserve Flash game soundtracks — Newgrounds and Kongregate archives still contain thousands of SWFs whose MP3 music tracks are worth keeping. Opus at 96 kbps matches or beats the original MP3 at 128 kbps while files shrink ~25%.
• Re-edit animation audio in a modern NLE — DaVinci Resolve, Premiere Pro 2024+, and Audacity 3.x do not import .swf. Converting the audio out to .weba (or routing it through SWF to WAV for lossless editing) makes the track usable again.
• Replace MP3 with Opus for web embeds — If you're rebuilding a Flash-era site in HTML5, Opus-in-WebM is supported by Chrome, Firefox, Edge, and Safari 14.1+ and gives you smaller payloads with no licensing concerns.
• Voice memo and podcast snippets — Speech encodes very efficiently in Opus; a 10-minute narration that was 9 MB MP3 inside the SWF can land near 4 MB as Opus VBR at 48-64 kbps.
• Discord, Telegram, and Mastodon attachments — All three accept WebM/Opus inline. SWF is rejected by every modern platform.

SWF vs WEBA (WebM Audio) — Format Comparison

Opus Bitrate Quick Guide

Opus is the default audio codec inside WEBA and adapts gracefully across a huge bitrate range. Pick by content type:

Frequently Asked Questions

Why is my converted WEBA file smaller than the audio inside the SWF?

That's expected. Flash typically embedded MP3 at 128 kbps or ADPCM at high overhead; Opus at the default 128 kbps preset (or the VERY_HIGH quality preset) is roughly 20-30% more efficient than MP3, so the same perceptual quality lands in a smaller file. If you need a byte-for-byte match, use "Specific file size" under File Compression and enter the SWF's original audio size in MB.

My SWF used the Nellymoser or Speex codec — will the conversion still work?

Yes. The converter decodes every audio codec Flash ever shipped (MP3, ADPCM, Nellymoser Asao, Speex, raw uncompressed PCM) and re-encodes to Opus. Nellymoser was Flash's low-bitrate speech codec from FlashCom era (2002-2006); it sounds rough at the source, so don't expect Opus to magically restore fidelity — but the resulting WEBA will play in every modern browser whereas Nellymoser-in-SWF won't.

Can I extract only a portion of the SWF audio?

Yes. Open the Trim group in Advanced Options, set Start (in seconds) to the offset you want to begin at, and Duration to how many seconds to keep. Defaults are 0 / 10 — change them to your actual timestamps. For multi-clip extraction, run the conversion once per range; xconvert doesn't currently support multiple trim ranges per file.

Should I pick Opus or Vorbis for WebM audio?

Opus, for almost every case. Opus (IETF RFC 6716, standardized September 2012) is newer, beats Vorbis at every bitrate per published listening tests, and is supported everywhere WebM is. Vorbis only makes sense if you're targeting a very old player that pre-dates 2013 — extremely unlikely in 2026. The converter defaults to Opus for WEBA; you'd have to explicitly select Vorbis under Audio Codec.

Why does my SWF audio extract come out silent?

Three likely causes: (1) the SWF uses streaming sound triggered by ActionScript that the decoder can't replay deterministically — try SWF to MP3 instead, which uses a different extraction path; (2) the audio is event sound with very short symbols that get muted on linear decode; (3) the SWF has no embedded audio and only synthesized tones via ActionScript Sound objects, which cannot be extracted because they don't exist as a stored asset. Inspect the SWF with JPEXS Free Flash Decompiler to confirm whether audio assets are present.

What's the difference between WEBA and OGG for Opus audio?

Both are containers that carry Opus. WEBA (.weba) is a WebM-profile container intended for web playback alongside WebM video. .ogg with Opus inside (sometimes called .opus) is the original Xiph container. They hold identical encoded audio — only the wrapper differs. WEBA tends to be preferred when you'll also use WebM video on the same site; .opus is the standalone audio default. Use SWF to OGG if you want the Xiph wrapper instead.

Does this work if the SWF was protected or obfuscated?

Most SWF "protection" tools obfuscate ActionScript, not the embedded audio streams — the audio is still extractable. Truly DRM-protected SWFs (rare; mostly some Adobe Connect recordings) cannot be decoded by any open tool. If extraction silently fails on a specific file, that's usually the cause.

Will the WEBA file play in QuickTime, Windows Media Player, or iTunes?

QuickTime (macOS native) does not play .weba; Windows Media Player on Windows 11 does not play .weba either. For those targets, convert to SWF to MP3 or SWF to WAV instead. WEBA plays natively in Chrome, Firefox, Edge, Safari 14.1+, VLC, mpv, and Audacity 3.4+. Android 10+ and Windows 10 1903+ register .opus/.weba extensions at the OS level.

Is there a file size limit?

Free conversions support files up to the standard xconvert upload cap; signed-in accounts get higher limits. SWFs are usually small (most are <20 MB even when they bundle long audio tracks because of Flash's strict ceiling on vector asset size), so the cap is rarely a constraint here.