Turn lossless FLAC audio into CRI ADX online for game-audio projects, compressed only once. Upload files up to 20GB and download the converted result in a few clicks.
Drag & Drop your FLAC file here
FLAC files, up to 20GB
Files stay private.
Automatically deleted after 24 hours.
Link
20GB upload limit.
4.8/5
Trusted for 1,827,796+ conversions
HOW IT WORKS
Three steps, no account, nothing to install.
01
Upload your FLAC files
Drag in the FLAC tracks or sound effects you want to use in an ADX-based game or tool.
02
Convert to ADX
Start the conversion. The FLAC is decoded and encoded as standard ADX (header type 3) with the sample rate kept.
03
Download the ADX
Download each ADX file, or the whole set as one ZIP.
FLAC
FLAC is the open lossless audio format, about half the size of WAV with every sample preserved.
ADX
ADX is CRI Middleware's game audio format, a 4-bit ADPCM codec used in Sega and many later console and PC games.
FILE FORMATS
SOURCE
The Free Lossless Audio Codec was released by Xiph.Org in 2001 and is the standard for lossless music downloads and CD archives. It typically shrinks audio to 50 to 60% of WAV size, decodes back to the exact original samples, supports up to 32-bit and high sample rates, and carries full tags and cover art.
TARGET
CRI Middleware's audio format, built for games. ADX uses 4-bit ADPCM, about a quarter the size of 16-bit WAV, so it decodes cheaply during gameplay and supports gapless loops. It shipped on the Sega Dreamcast and in many later console and PC games, and its newer successor is HCA.
| Feature | FLAC | ADX |
|---|---|---|
| Developed by | Xiph.Org | CRI Middleware |
| File extension | .flac | .adx |
| Compression | Lossless | Lossy (ADPCM) |
| Size vs uncompressed WAV | About 1/2 | About 1/4 |
| Tags and cover art | Full tags and cover art | None (loop data only) |
| Best for | Lossless music and archives | Game music, voice and effects |
| Plays on phones and browsers | Most phones and browsers | No, needs a game engine or vgmstream |
USE CASES
When ADX fits the next step better than the original FLAC.
Replace music in a mod you are allowed to edit
Build ADX replacement tracks from lossless FLAC so the audio is compressed only once.
Prepare fan-made audio for an ADX game engine
Convert your own compositions to ADX for a project that loads ADX streams.
Test ADX playback in vgmstream
Make a quick ADX from a known FLAC to check how a game or player handles it.
Match a legacy CRI pipeline
Older CRI-based toolchains expect ADX input instead of FLAC.
Prototype a sound bank
Create ADX test assets before building a full CRI Atom project.
Compare ADPCM against the lossless original
Keep the FLAC and the ADX side by side to judge the quality difference.
Convert voice lines for a fan translation
Prepare recorded dialogue for a project you have permission to modify.
Build homebrew audio
Create ADX files for homebrew projects that read CRI audio.
Standardize a project's sound assets
Convert approved FLAC masters to the ADX format the rest of the project uses.
Give testers a matching file
Share an ADX made from the same FLAC master so QA compares like with like.
SUPPORTED FILES
Start from the best FLAC you have. Lossless input gives the cleanest ADX.
Any common bit depth is accepted and encoded to ADX's 4-bit ADPCM.
The ADX keeps the FLAC's sample rate, so match the rate the game expects before converting.
Both are kept as they are. ADX holds only mono or stereo, so surround FLAC is mixed down to stereo.
Upload many FLAC files and download the ADX files together as a ZIP.
If you only have MP3 or OGG, our MP3 to ADX and OGG to ADX converters handle those.
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 and resample the FLAC to match before converting.
02
Many commercial games use encrypted ADX with a game-specific key. A standard ADX may not play in those titles.
03
The ADX has no loop points. Add them in your ADX tool or game engine.
04
Compare the track's loudness with the game's other audio and adjust the FLAC before converting.
05
The ADX keeps the FLAC's channel count. Match the original game file's channels first.
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 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.
1.8M+
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WHY DRAGDROPDO
Convert FLAC to ADX in your browser, with nothing to install and nothing kept after 24 hours.
Private by default
Files are encrypted in transit and deleted from our servers automatically after 24 hours.
No install required
Convert in any modern browser on Windows, Mac, Linux, Android, iPhone or iPad. No app and no sign-up wall.
Big files and batches
Upload files up to 20GB each, add several at once, and download the results one by one or as a ZIP.
Share & download
Save finished files to your device or pass them on with a share link from the result page.
MORE FLAC TOOLS
FLAC (Free Lossless Audio Codec) is a popular audio format that compresses music without losing quality. Ideal for audiophiles, FLAC preserves the original sound integrity while reducing file size, making it perfect for digital music libraries and high-resolution audio. With widespread support across devices and software, FLAC is the go-to choice for lossless audio compression.
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FAQ
Answers to common questions about dragdropdo's FLAC to ADX converter.
