Turn MP3 audio into ADX online for supported game-audio and general playback workflows. Upload files up to 20GB and download the converted result in a few clicks.
Convert ADX to MP3Drag & Drop your MP3 file here
MP3, WAV, AAC, FLAC, M4A, and other supported audio formats, up to 20GB
Files stay private.
Automatically deleted after 24 hours.
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20GB upload limit.
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HOW IT WORKS
A straightforward three-step workflow for the format you need.
01
Add MP3 files
Drag and drop or upload the MP3 files you want to convert to ADX.
02
Start ADX conversion
Choose ADX as the output format and start the conversion.
03
Save the result
Download each ADX file as it finishes, or collect batch results together when a zip download is available.
MP3
MP3 is a lossy compressed audio format built for small files and broad playback compatibility. It works on almost every phone, browser, car stereo, media player, and editing application.
ADX
ADX is a compressed audio format from CRI Middleware used in many video games and interactive-media pipelines. It can support looping and other game-audio workflows, but compatibility depends on the target engine or toolchain.
FILE FORMATS
SOURCE
The format almost every recording ends up in. MP3 is lossy and compact, around a tenth the size of uncompressed WAV at 128 kbps, and it plays on every phone, browser and editor. That makes it a great source file, but most game engines built on CRI middleware can't load it directly.
TARGET
CRI Middleware's audio format, built for games. ADX uses ADPCM compression, about a quarter the size of WAV, so it decodes cheaply during gameplay and supports seamless loops. It shipped on the Sega Dreamcast and in many later console and PC games. Its newer successor is HCA.
| Feature | MP3 | ADX |
|---|---|---|
| Developed by | MPEG (Fraunhofer) | CRI Middleware |
| File extension | .mp3 | .adx |
| Compression | Lossy (perceptual) | Lossy (ADPCM) |
| Size vs uncompressed WAV | About 1/10 at 128 kbps | About 1/4 |
| Decoding cost | Moderate | Low, built for real-time playback in games |
| Seamless loops | Not supported | Supported |
| Main use | Music, podcasts, general playback | Video game music, voice and effects |
| Plays on phones and browsers | Yes | No, needs a game engine or specialist player |
USE CASES
When ADX fits the next step better than the original MP3.
Prepare audio for an ADX-based game pipeline
Convert a working MP3 asset to ADX when a supported engine, tool, or legacy project expects that game-audio format.
Prepare audio for device-specific playback
Use ADX when an embedded or legacy playback environment is built around that format.
Create a test asset for an interactive project
Use the conversion to make a small ADX file for validating playback, integration, looping, or pipeline behavior.
Create compatibility copies for QA
Keep the original MP3 and a converted ADX so testers can compare playback in the target environment.
Test loop-ready audio in a target format
Create an ADX version and verify loop points and playback behavior in the actual destination tool or engine.
Match an existing game's audio format
Convert legitimate project audio to ADX when maintaining or modding a project you are authorized to work with.
Prepare replacement audio for a legacy toolchain
Use ADX when an older content pipeline cannot ingest the original MP3 file.
Build a prototype sound bank input
Convert source audio to ADX as a preliminary asset for a game-audio workflow that supports it.
Package approved audio for a game build
Convert the source only when the destination build pipeline specifically requires ADX and the settings are compatible.
Standardize game-audio delivery
Convert approved source audio to the format used by the rest of a project's sound assets.
SUPPORTED FILES
Start with the audio you already have. You don't need a separate tool for each source format.
Upload it directly. This is the most common source for this converter.
Supported, and the best choice. Lossless sources give the cleanest ADX because the audio is only compressed once.
Supported. Like MP3, these are lossy, so start from a lossless original if you have one.
Add them together. They convert as one batch you can download as a ZIP or share with one D3 link.
Split or compress the audio first. Each file can be up to 20GB.
Only convert audio you own or have permission to use. Having a file doesn't automatically give you the right to put it into someone else's game.
TROUBLESHOOTING
Most problems come down to settings the game expects, not the conversion itself.
01
The game probably expects a different sample rate. Check the original ADX file and match its sample rate and channel count.
02
Many commercial games use encrypted ADX with a game-specific key. A standard ADX file may not play in those titles.
03
MP3 files don't store loop points, so there's nothing to carry over. Add them in your ADX tool or game engine.
04
MP3 and ADX are both lossy, so the audio is compressed twice. Convert from a WAV or FLAC original instead.
05
Game soundtracks are usually mixed to similar levels. Compare your track's volume with the game's other audio.
06
Make sure the new file uses the exact name and folder of the one it replaces, then test it in the actual game or build.
Desktop encoders and CRI's own tools are built for full game-audio pipelines. dragdropdo is built for getting an ADX file quickly, from any device.
| What matters | dragdropdo | Desktop ADX tools |
|---|---|---|
| Nothing to install | ✓Yes. Runs in any modern browser. | ~Usually a download, and often command-line setup. |
| Works on phones and tablets | ✓Yes. Desktop, Android, iPhone and iPad. | ~Most are built for Windows or the command line. |
| Batch conversion | ✓Yes. Add many files and download one ZIP. | ~Varies by tool. Often needs scripting. |
| Share finished files | ✓Yes. Send a unique D3 link from the result page. | ~You upload and share the files yourself. |
| Pricing | ✓Free with daily limits. $2.99 or $6.99 passes for unlimited use, no monthly plan. | ~Ranges from free community tools to licensed middleware. |
| Setting loop points | ✓Not in the converter. Add loops afterwards in your engine or ADX tool. | ~Dedicated ADX tools often let you set loop points directly. |
Other tools use different pricing, limits and workflows. This comparison describes dragdropdo's own features without assuming every other tool works the same way.
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WHY DRAGDROPDO
Convert MP3 files in the browser with a simple workflow designed for privacy, compatibility, and fast handoff.
Private by default
Files are encrypted in transit and automatically removed after 24 hours.
No install required
Run the conversion in your browser — no desktop app and no sign-up wall to get started.
Cloud import
Pull supported files from Google Drive and keep working without downloading them locally first.
Share & download
Download finished files, collect batch results as a zip, or use available share-link and QR options for handoff.
MORE MP3 TOOLS
MP3 is a popular audio file format known for its efficient data compression and relatively high quality, making it ideal for music and audio streaming. Widely used for music downloads and digital media, MP3 files maintain a balance between sound quality and file size, ensuring quick downloads and easy sharing across platforms and devices.
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FAQ
Answers to common questions about dragdropdo's MP3 to ADX converter.
