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How to DJ with YouTube: UTubeDJ guides

Practical guides for mixing two tracks in the browser, from your first crossfade to a full set.

UTubeDJ turns a browser tab into a working two-deck DJ setup: Deck A and Deck B each stream a YouTube video or an entire playlist, and a set of faders blends them into one continuous mix. Nothing needs to be installed, and the music never has to leave YouTube. That makes it a fast way to learn the parts of DJing that actually matter, which are choosing tracks, counting bars, and making one song arrive inside another without a seam.

The guides below follow the same order you would learn on hardware. Start by loading a track into each deck and matching their volume faders, then bring the second track in with the crossfader instead of dropping it on top of the first. From there, use each deck's tempo control to line the two tracks up, watching the twin waveforms to see where the beats and the breakdowns sit. When you can hold two tracks together, move on to queues and playlists: send a search result to the queue so the next track is a click away, or load a full playlist and mark the tracks you want to jump to. Saving a playlist to your account keeps that set ready for the next session, and the recorder captures what you play so you can listen back and hear which transitions worked.

Each guide is short enough to read between tracks. Read one, load two songs, and try the idea straight away on the decks.

Beatmatchingbeginner3 min read

How to match tempo and hold two tracks in sync

Use each deck's tempo control and the twin waveforms to keep a blend tight instead of drifting apart.

Two tracks only sound like one when their beats land together. Each deck in UTubeDJ has its own tempo control with preset steps from 0.25x to 2x. Load the faster track and slow it slightly, or load the slower one and speed it up, until both decks are running at roughly the same speed. A small change is usually enough: a couple of percent covers most dance tracks.

The waveform panels above the mixer show both decks side by side. Watch the peaks, which are the kicks, and compare how often they repeat. When the peaks arrive at the same moments, the tracks are in sync. When the peaks drift apart, the tempo is off and one deck is running ahead of the other.

Start with the crossfader fully on the track you are mixing into, listen for the beat, then open the other deck and count along. If the second track sounds like a double kick, it is slightly too fast or too slow, so nudge the tempo a step in either direction until the flam disappears. Practise with two songs you know well before adding a third. Live music and older recordings drift on their own, so pick steady, four-to-the-floor tracks while you learn.

Set buildingintermediate3 min read

Build a set with playlists, queues and Auto Mix

Turn a pile of search results into a flowing hour using deck playlists, priority tracks and the queue.

A set is less about individual songs than about what follows what. UTubeDJ lets you load a whole YouTube playlist into a deck, which gives that deck a running order to move through. Use one deck for the playlist you are working from and the other deck for tracks you pull out of search or from a second playlist, and you can jump between them whenever the energy needs to change.

The playlist side panel shows every track in the loaded playlist. Tap a track to play it immediately, or mark tracks you want to reach soon so they jump ahead of the normal order. The queue is for one-off additions: search for a song, send it to the queue, and it stays one click away until you either play it or remove it. Priority items in the queue play before anything else, which is how you rescue a floor when a request lands mid-set.

When you want to step away, Auto Mix takes over. It shuffles both playlists, blends the handovers and crossfades for you, keeping the levels balanced while you talk to the room. The play and pause controls on the active deck still work during Auto Mix, so you can hold the mix where it is and pick it back up when you are ready.

Recordingbeginner2 min read

Record your first mix and listen back

Capture a set, then use the recording to spot the transitions that worked and the ones that did not.

The fastest way to improve is to hear your own mixing from the outside. Hit record before you start and let the set run. Play it back the next day and listen for the moments where two tracks landed together, and the moments where one arrived too early, too loud or in the wrong key. Most DJs hear their own mistakes far more clearly in a recording than they did in the moment.

Keep the first recordings short. A fifteen minute set with four or five well-chosen transitions teaches more than an hour of drifting through tracks. Note which pair of songs worked, write down the tempo change you made, and use that combination again next time.

A recording also tells you about levels. If the room sounded full but the recording is quiet, the master knob was probably too low; if the recording clips, pull the master and the deck faders down together. Once you have a set you like, save the playlist to your account so the same tracks, in the same order, are waiting for you the next time you open the decks.

Basicsbeginner2 min read

Your first crossfade: mixing two YouTube tracks

Load a track into each deck and blend them with the crossfader instead of cutting between songs.

Every mix starts with two tracks. Paste a YouTube link or video ID into Deck A, then find a second song that shares a tempo or a mood and load it into Deck B. Press play on Deck A and let it run while you get the second track ready. The crossfader in the middle of the mixer decides which deck you hear: all the way left means only Deck A, all the way right means only Deck B.

Bring the crossfader to the left and start Deck B on its first beat with the volume fader on that deck set a little lower than Deck A. Now move the crossfader slowly toward the middle. You should hear the incoming track sit underneath the outgoing one rather than arriving on top of it. If it feels like a collision, pull the crossfader back, line the tracks up, and try again.

The trick most beginners miss is timing the move around the outgoing song's structure. Start the blend when the current track hits a breakdown or a repeating bar, and finish the crossfade as the next section arrives. Saved playlists make this easier: you can reload the same two tracks and practise the same handover until it feels automatic.