Free AI Mix and Master
Try free AI Mix and Master online with the mix you already have. AI mixing and mastering helps you hear clearer balance and release-ready audio in seconds—no sign up required.
Upload your mix, or drop it here
WAV · MP3 · FLAC · AIFF · M4A
Up to 200 MB · processed privately in your browser
Key features
A stereo master cannot always fix a vocal that is buried or a rhythm section that overwhelms the song. Mix + Master uses local AI stem separation to create vocals, drums, bass, and music groups, makes a measured rebalance, and then sends that revised stereo mix through the same release-oriented mastering chain.
The browser separation model estimates vocals, drums, bass, and remaining music from your stereo file. These groups create practical control when the original session is unavailable. They are intended for broad corrective moves, not for reconstructing every microphone, synth layer, backing vocal, or effect return from the production.
Useful separation without pretending to recover the original session.
AI Mastering analyzes the energy and spectral role of each separated group before building a revised mix. The goal is to improve hierarchy—such as a clearer vocal or tighter bass relationship—through restrained moves that feed a healthier mastering chain rather than dramatic fader changes that expose separation artifacts.
Small, contextual moves protect the character of the source.
The rebalanced stems are recombined and passed directly into tonal shaping, dynamics control, stereo processing, loudness, limiting, and quality checks. Keeping both stages in one workflow helps the final master respond to the revised balance instead of applying a disconnected preset designed for the uncorrected source.
Rebalance and mastering decisions are evaluated as one signal path.
The separation model downloads when Mix + Master needs it and is cached by the browser when supported. The first run takes longer because the model must be prepared and verified; later sessions on the same browser can reuse that local copy. The audio processing itself remains on your device.
First-run setup is heavier; repeat sessions can start faster.
Review the final result against the untouched source at the same timestamp. Listen for vocal intelligibility, kick and bass separation, drum impact, musical ambience, and any watery or phase-like separation artifacts. The A/B player keeps the decision grounded in the complete song rather than isolated stems.
Judge the finished record, not soloed separation novelty.
After rebalancing, AI Mastering applies your chosen genre, platform, tonal, and loudness direction with true-peak protection. The completed project creates a 48 kHz, 24-bit WAV for high-quality delivery and can create a 320 kbps MP3 for sharing when the browser supports the encoder.
Stem correction ends in a deliberate, protected delivery file.
How to use it
Mix + Master is designed for a stereo file that is close but has one or two balance problems. You keep one source and one release goal while the browser handles the model, adaptive remix, and mastering chain in sequence.
Choose the cleanest export available, ideally WAV, AIFF, or FLAC, with no clipping and enough headroom for processing. MP3 and M4A are supported, but lossy artifacts can become more audible after separation. If you still have the original multitrack session, fix major balance problems there before using a stereo recovery workflow.
The browser downloads and verifies the AI model when needed, estimates the four stem groups, analyzes them, and creates a restrained adaptive remix. Keep the page open during the first run. Separation quality depends on the arrangement, effects, overlap, and encoding already present in the uploaded stereo file.
The revised mix moves through the mastering chain using your release settings. Compare the final result with the untouched source on multiple playback systems. If artifacts outweigh the balance improvement, choose standard Mastering or return to the mix. Rerenders for the same authorized source remain part of one project.
Stereo mix → Four stems → master
Separate → Finish
Vocals
Focused
Rhythm
Balanced
Export
24-bit WAV
Why AI Mastering
Mix + Master occupies the useful middle ground between a normal stereo master and reopening the full production. It provides enough source separation for careful balance repair, while keeping limitations visible and the final listening decision in your hands.
Decoding, model inference, stem analysis, adaptive remixing, and mastering run in the browser. Your machine does the demanding audio work rather than sending the song to a remote separation queue. Authorized account projects keep the source and latest master private for history and protected download.
A new exact filename and SHA-256 source costs 10 credits. That one project unlocks Mix + Master, standard Mastering, and Reference Mastering, plus unlimited settings rerenders during retention. If separation is not the best answer, compare another mode without buying the same source again.
The adaptive remix aims for controlled improvements that survive recombination and mastering. It avoids presenting isolated stems as perfect studio tracks or encouraging extreme changes that reveal model artifacts. The feature is built to finish a release, not to turn one stereo bounce into a new production session.
Where it fits
Use this path when a specific balance issue is holding back an otherwise viable mix and the original session is unavailable, inconvenient to reopen, or needs a fast release preview.
Give a catalog track or archived demo a more useful vocal, rhythm, and musical balance when you no longer have reliable stems. Keep expectations restorative rather than reconstructive.
Test whether a modest vocal or low-end correction solves the approval issue before asking for a session recall. The preview can clarify whether the mix or only the master needs more work.
Create an alternate balance for small speakers, social previews, or a denser delivery target, then compare it with a normal master and select the version that preserves the song.
Final quality check
AI separation is an estimate built from a finished stereo mix. A useful review checks whether the hierarchy improved and whether the model introduced audible costs that standard mastering would avoid.
Listen for watery tails, gated reverbs, missing backing details, or phase-like edges around the vocal. These signs may mean the source is too intertwined for a cleaner stem-based move.
Confirm that low-end definition improved without hollowing the kick, thinning sustained bass, or moving important percussion into the wrong group. Check headphones and small speakers.
Play quiet and loud sections end to end. A balance that fixes the chorus may expose the separation during an intimate verse, so keep the pass only when it works across the arrangement.
Simple project pricing
Configure the source and release direction before signing in. One new source project unlocks every mastering mode and revisions during retention, so the heavier Mix + Master path remains part of the same transparent credit model.
Studio setup
Free to configure
Choose your local audio, switch between all three mastering modes, and set the release direction. Sign in when you create a master to authorize processing, history, and download.
Start configuringFull source project
10 credits
Unlock Mastering, Reference Mastering, Mix + Master, protected download, and unlimited parameter rerenders for the same source during retention.
Compare AI mastering plansFAQ
Answers about local AI stems, model downloads, supported inputs, separation quality, privacy, credits, exports, ownership, performance, and when the original session is still the right tool.
Mix + Master is a browser workflow that estimates vocals, drums, bass, and remaining music from one stereo file, builds a restrained adaptive rebalance, and then masters the revised mix. It is designed for broad corrective control when a normal master cannot reach one problem, not as a replacement for a full multitrack mixing session.
No. AI separation estimates musical groups from audio that has already been combined, processed, and often limited. Effects and overlapping instruments may appear across groups, and some detail can be imperfect. The stems are temporary working material for the local rebalance; they should not be treated as identical to the original tracks or session exports.
The browser must download and verify the HTDemucs separation model before inference can begin. The model is large enough that the first run depends on your connection, device, and browser storage. Supported browsers cache it locally, so later Mix + Master sessions on the same browser can often skip most of that setup.
A current desktop browser with adequate memory and a reasonably modern CPU is the best fit. Separation is much heavier than standard mastering, so older laptops and mobile devices can be slow or run out of resources. Keep the page open, close other demanding tabs, and use standard Mastering if the device cannot complete local model processing reliably.
Use the highest-quality stereo bounce available, ideally WAV, AIFF, or FLAC without clipping. MP3 and M4A files are supported up to 200 MB, but existing codec artifacts may become more noticeable during separation. If you have the real production session or clean exported stems, make major balance changes there and upload the improved stereo mix for mastering.
No. It can help with broad balance, but it cannot restore detail that was clipped, masked, distorted, or removed before export. Dense arrangements, heavy reverb, doubled parts, and instruments sharing the same range can reduce separation quality. If the artifacts are more distracting than the original issue, use standard Mastering or return to the mix session.
The model inference and heavy audio processing run locally in your browser. When you authorize an account project, AI Mastering stores the original source and latest completed master privately so project history and protected downloads work. The temporary stem processing is part of the local workflow. Review the privacy and retention terms for stored project files.
A new source identified by its exact filename and SHA-256 costs 10 credits. That project includes Mix + Master, Reference Mastering, standard Mastering, and unlimited parameter revisions during retention. Running another mode for the same authorized source does not charge again. Renaming the source produces a different project identity.
The completed project provides a 48 kHz, 24-bit WAV master for high-quality delivery. When the browser supports the encoder, you can also create a 320 kbps MP3 for review and sharing. The current workflow does not export the temporary separated vocals, drums, bass, and music groups as a stem package.
Return to the session when you need detailed automation, effect changes, timing edits, instrument replacement, clean stem delivery, or reliable control over one element. Mix + Master is valuable for stereo-only archives, previews, and modest balance repair. A real mix session or experienced engineer remains the better choice for high-stakes releases with substantial source problems.
Upload the best stereo bounce you have, let the browser build a careful stem-aware balance, and compare the finished master with the untouched source.
Create Master