You can mix two songs right now, in your browser. No software to install. No account to create. Open djmixer.online/mixer, load two tracks, and blend them together. This guide walks you through the process from start to finish.
Step-by-Step: Your First Mix
- Open the mixer. Go to djmixer.online/mixer. You will see two decks — Deck A on the left, Deck B on the right — with a crossfader in between. That is your workspace.
-
Load a track on Deck A.
Click the
Loadbutton on Deck A, or drag an audio file directly onto the deck. The mixer accepts MP3, WAV, FLAC, OGG, and most other common audio formats. Once loaded, you will see the waveform appear and the BPM will be detected automatically. - Load a track on Deck B. Same process on the right side. Pick a second track. For your first mix, choose two tracks with similar BPMs — within 5 BPM of each other makes things easier. The BPM display on each deck shows you the detected tempo.
-
Match the BPMs.
If the BPMs are different, click the
Syncbutton on either deck. This adjusts that deck's playback speed to match the other deck. Both tracks will now play at the same tempo. If you want to learn manual beatmatching later, you can skip sync — but for your first mix, use it. -
Play Deck A.
Hit the
Playbutton on Deck A. Make sure the crossfader is all the way to the left (the A side). You should hear Track A playing through your speakers. -
Start Deck B at the right moment.
Listen to Track A. Wait for a natural transition point — the start of a new phrase, a breakdown, or the beginning of an 8-bar section. Then hit
Playon Deck B. The timing of when you start Track B matters. Starting on beat one of a phrase gives you the cleanest entry point. - Use the crossfader to blend. Slowly move the crossfader from the left (A) toward the center. Both tracks are now audible. Keep moving toward the right (B) over 8 to 16 bars. As the crossfader reaches the B side, Track A fades out and Track B takes over. Your first transition is done.
- Use the filter to make it clean. For a smoother blend, use the filter knob on Deck A. Turn it to cut the bass frequencies from Track A as Track B comes in. This prevents the bass lines from clashing. The filter knob sweeps from low-pass (left) through neutral (center) to high-pass (right) — turn it right to remove the low end from the outgoing track.
Tips for Better Mixes
Pick songs in the same key
When two tracks share the same musical key (or a compatible key), their melodies and harmonies work together during the blend. When the keys clash, the overlap sounds dissonant — even if the beats are perfectly aligned. You do not need to know music theory to solve this. Use the TuneLab Camelot Wheel to find which of your tracks are compatible, and the TuneLab BPM Finder to pre-analyze tempo before loading tracks into the mixer.
Match energy levels
A high-energy peak-time track blended into a downtempo intro will feel jarring, no matter how clean your transition is. Think about the energy arc. If Track A is building, Track B should continue that build or sustain the energy. If Track A is in a calm section, Track B can be a calm intro that builds up — creating a natural progression.
Use the Auto Transition
If both decks are loaded and playing, the Auto Transition button will execute a smooth crossfade for you. This is useful for learning what a good transition sounds like before you can execute one manually. Listen to how the auto transition handles timing and volume, then try to replicate it yourself.
Listen to the waveforms
The waveform display shows you the structure of each track visually. Dense, tall sections are loud (drops, choruses). Sparse, short sections are quiet (breakdowns, intros). Aim to start your transition during a sparse section of Track A, bringing in Track B during its sparse intro. By the time both tracks reach their dense sections, you should have completed the crossfade so only Track B is audible.
What Comes Next
Your first mix will not be perfect. That is expected. The important thing is that you did it. You loaded two tracks, matched their tempos, and blended them. That is the fundamental act of DJing.
From here, practice these refinements:
- Try mixing without sync — adjust tempo by ear.
- Experiment with the EQ crossfade technique for cleaner transitions.
- Record your mixes and listen back to identify what works and what does not.
- Build a collection of tracks you know well — their BPMs, keys, energy levels, and structure.
Every professional DJ started by blending two tracks together for the first time. The only difference between then and now is that you can do it in a browser tab. Once you are comfortable with the basics, read our full guide on how to DJ to develop beatmatching, EQ technique, and reading a crowd.
Start mixing now.
Launch Mixer →