Convert Shockwave Flash (.swf) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .swf file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .amr file when it's ready.
SWF (Shockwave Flash) is Adobe's discontinued multimedia format. AMR (Adaptive Multi-Rate) is a voice-optimized audio codec originally developed for GSM cellular networks, encoding speech at very low bitrates (4.75-12.2 kbps). Converting SWF to AMR extracts audio from Flash files and encodes it as a compact voice file suitable for mobile telephony, MMS messages, and devices optimized for speech rather than music playback.
AMR was designed specifically for human speech, using a codec tuned to the frequency range and patterns of spoken language. For Flash e-learning narrations, voice messages, and spoken-word content, AMR produces extremely small files while maintaining intelligible speech quality.
AMR files are ideal when Flash audio content consists of speech and the target is mobile distribution with minimal file size. Voice-over narrations from Flash training modules, recorded lectures, and instructional content convert to AMR at a fraction of the size of MP3 or AAC, making them suitable for transmission over slow mobile networks and storage on devices with limited capacity.
Feature phones and basic smartphones in many regions support AMR as a native audio format. For organizations distributing audio content to audiences using basic mobile devices, AMR is the most widely supported low-bitrate voice format.
The conversion engine uses FFmpeg to extract audio from the SWF container, decode it from the Flash audio format, resample to 8 kHz mono (the AMR standard), and encode using the AMR-NB (Narrow Band) codec at the default 12.2 kbps bitrate. The output is an AMR file with the standard #!AMR header. Audio bandwidth is limited to 300-3400 Hz, matching the telephony speech band.
AMR is optimized for speech intelligibility, not music fidelity. Voice content converts with good clarity at extremely small file sizes. Music, sound effects, and complex audio will sound noticeably degraded due to the narrow frequency band and low bitrate. A one-minute AMR file is approximately 95 KB — roughly 1/15th the size of an equivalent MP3 file. Use AMR only for voice content where compact size is the priority.
| Device | SWF | AMR |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
SWF to AMR conversion extracts voice content from Flash files into the most compact speech audio format, ideal for mobile telephony and low-bandwidth distribution.
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| No |
ทุกเบราว์เซอร์ ทุกอุปกรณ์
| ฟีเจอร์ | SWF | AMR |
|---|---|---|
| ชื่อเต็ม | Shockwave Flash | Adaptive Multi-Rate Audio |
| นามสกุล | .swf | .amr |
| เหมาะที่สุดสำหรับ | Flash format | Speech optimized |