Tempo is driven by targetBpm: the plugin derives the rate as bpm / originalBpm and the export clamps it to 0.25–4.0 (Math.max(0.25, Math.min(4.0, rate))).
Library
Reading your local library…
Smart DJ File Renamer.
Deterministic batch renamer for DJ library tracks based on metadata tags and audio analysis.
Load audio files, folders or playlists
Inspect metadata tags, detect messy names, and batch rename automatically or with manual inline edits.
Drop your audio tracks here or click to browse
Lossless (WAV, FLAC, AIFF) and Lossy (MP3, AAC, M4A) · Local Processing Only
Duplicate Detector & Safe Archiving.
Identify identical and alternate quality duplicate tracks in your collection.
Drag & drop files or folders
or click to browse
Detect exact duplicates (SHA-256) and acoustic matches with quality recommendations
←Home
DJ Database & Playlist Converter.
Convert Rekordbox, Traktor, VirtualDJ and Serato collections 100% locally.
Need to convert a USB flash drive in-place without duplicating audio?
Use DJ USB Converter In-Place →Source Library
or click to browse
Supports Rekordbox .xml, Traktor .nml, and VirtualDJ .xml
←Home
DJ USB Converter.
Transmute DJ USB drives between Pioneer, Denon Engine OS and Serato in-place without copying or duplicating audio files.
Looking to convert desktop collection files (.xml, .nml, .crate, .sql)?
DJ Library ConverterIntegrity Guarantee & Safe Backups
- Zero audio bytes duplicated: MP3, WAV, AIFF and FLAC files remain untouched in their original locations on the drive.
- Automatic pre-write backup: Before any database file is updated, an exact copy is verified and saved to Deckmatics Backups.
- Explicit access: The browser requests read/write permissions only when you explicitly click the button below.
DJ USB Storage Media
Transmutes existing DJ USB drives in-place without copying or duplicating audio files.
Connect or select your USB drive to inspect its DJ topology.
Pioneer, Engine Library and _Serato_ folders will be checked to provide cross-compatibility without touching your audio tracks.
Multitrack Editor.
BAR1.1.1
TIME00:00.000
BPM
SIG4/4
Snap
Grid
TRACKS (2)
1(0:00)
2
3
4
5
6
7
8
9(0:16)
10
11
12
13
14
15
16
17(0:32)
18
19
20
21
22
23
24
25(0:48)
26
27
28
29
30
31
32
33(1:04)
34
35
36
37
38
39
40
41(1:20)
42
43
44
45
46
47
48
49(1:36)
50
51
52
53
54
55
56
57(1:52)
58
59
60
61
62
63
64
65(2:08)
66
67
68
69
70
71
72
73(2:24)
74
75
76
77
78
79
80
81(2:40)
82
83
84
85
86
87
88
89(2:56)
90
Track 1
PanC
Volume-3.0 dB
Track 2
PanC
Volume-3.0 dB
MMASTER
BUSPanC
Volume0.0 dB
MASTER OUTPUT BUS|0.0 dB
Empty Project Session
Drag and drop audio files here or use the buttons below to import tracks.
Time Stretch & Pitch.
Drag & drop files or folders
or click to browse
Studio Audio Recorder.
High-fidelity audio recording for microphones, DJ USB sound cards or system audio with peak and RMS metering
IDLE
00:00.000
PEAK VUMETER
L
-inf
0 dB-3-6-12-18-24-36-48-60 dB
R
-inf
48.0 kHz · 24-bit PCM
Time Stretch & Pitch Online
Time Stretch & Pitch Online
Change timing and pitch using only the independent controls and algorithms that are implemented in the current tool.
Supported formats: WAV MP3 AIFF
What this tool actually does
Change timing and pitch using only the independent controls and algorithms that are implemented in the current tool.
Key lock keeps pitch independent of tempo: with key lock on and 0 semitones, the export runs the in-tree WSOLA timeStretch(pcmChannels, stretchRate, opts) instead of a playback-rate change.
Pitch shifts with pitchSemitones plus fineTuneCents, and speedToSemitones converts a rate into semitones; with key lock off the tempo change modulates pitch directly, like a turntable.
Three algorithms are implemented — polyphonic, transient and tonal — and getStretchOptionsForAlgorithm picks the WSOLA frame and overlap for each one.
The offline branch for this view re-renders the stretched or rate-shifted audio and exports it as WAV, MP3 or AIFF.
Real-world use cases
What people actually solve with this converter before they play live.
Prepare tracks before a DJ set.
Fix or process files without opening a full DAW.
Keep the workflow focused on the specific task instead of a general-purpose editor.
Recommended Academy guides
Sample rate, bit depth, codecs and booth errors explained with rigour.
Harmonic Mixing & Camelot · ES
Harmonic Mixing with Camelot: Relative Keys, Energy and Misdetected Keys
How to use Camelot in the booth, what the relative major/minor implies, how to make energetic changes that do not clash and when to distrust the detected key (Academy guide in Spanish).
Read guide (ES)
Set Structure & Energy Flow · ES
Programming a Set: Typical BPM, Phrasing, Structure and Energy Flow
How to programme a set by genre: typical BPM, phrasing, structure, usual transitions, common risks and energy flow so you do not lose the floor (Academy guide in Spanish).
Read guide (ES)
Related tools
Complementary utilities to finish preparing your tracks.
Online Multitrack Audio Editor
Build quick DJ edits and layered arrangements in a browser-based multitrack workspace using only implemented editor features.
Open tool
Audio Trim & Split Online
Trim or split supported audio files with the exact editing and export behavior implemented by the current tool.
Open tool