Free AI BPM Finder: Detect Song Tempo Online
Find the exact BPM (tempo) of any song in seconds. Upload your track, and the AI will isolate the instrumental and analyze the beat to give you a precise tempo reading for your DJ sets, production, or workouts. 100% private, no upload, no sign-up.
- No upload
- AI runs locally
- Instant BPM read
- Bonus WAV stems
BPM Finder – Detect Song Tempo Instantly
Upload a song and our AI will isolate the instrumental and detect the exact BPM for your DJ sets, remixes, or workouts.
Up to 30MB. Long songs can be processed in sections.
AI engine loads when needed
AI mode gives the best result. If a phone runs out of memory, tap ⚡ Quick and press Separate again.
Cleanest separation. Use on a desktop or laptop with a good processor and 8GB+ RAM. ★ Recommended for this device.
How do I find the BPM of a song for free?
Use the ToolDeck BPM Finder: drop an MP3, WAV, or M4A into the tool above, wait for the AI to process it locally in your browser, then check the BPM badge next to the Instrumental track in the player. It is free, needs no account, and your audio is never uploaded.
- Price
- Free: no account, no watermark, no daily limit
- Upload required?
- No. AI runs 100% locally in your browser
- Input formats
- MP3, WAV, M4A
- Output
- Detected BPM + Instrumental & Acapella WAV files
- Accuracy
- High on most 4/4 electronic, pop, and rock tracks
- AI model
- MDX-architecture model run with ONNX Runtime Web (WebGPU, WASM fallback)
- Privacy
- Audio files never leave your device
- First load
- ~67MB model download, cached in the browser afterwards
- Processing time
- Depends on device; desktop with WebGPU is fastest
- Works on
- Modern Chrome, Edge, Safari and Firefox; desktop recommended
- Offline
- Yes, after the model has been cached once
How to find a song's BPM in 3 steps
- 1
Upload your song
Drag and drop an MP3, WAV, or M4A file into the tool. The audio loads locally in your browser; nothing is sent to a server.
- 2
AI isolates & analyzes
The tool separates the vocals from the instrumental and runs a peak-detection algorithm on the instrumental to find the tempo.
- 3
Read your BPM
The detected BPM is displayed right next to the Instrumental track in the player. You can also download the stems for your DAW.
Have a video instead of an audio file? Extract the sound first with Video to MP3. Need to cut a long track into shorter parts? Use the MP3 Cutter first.
What can you do with a BPM finder?
From beatmatching your next DJ set to building the perfect running playlist, here is how people use BPM detection.
| Use case | What you can do | Output |
|---|---|---|
| DJ mixing | Match the tempo of two songs for seamless beatmatching and transitions | Find BPM for DJ set |
| Music production | Set your DAW project tempo to match a sample or reference track | Detect BPM for sampling |
| Running & workout playlists | Build a playlist where every song matches your target running cadence (e.g., 160 BPM) | Check BPM for fitness |
| Dance choreography | Find the exact tempo for dance routines, counting steps, or timing choreography | Extract BPM for dance |
| Remixing & mashups | Time-stretch an acapella to match the BPM of a different instrumental | Get BPM for remix |
| Music education | Analyze the tempo of different genres to study rhythm and pacing | Export BPM data |
Who this BPM finder is best for (and when it is not)
Best for
- Fast, private BPM detection with no account or upload
- DJs and producers who need a quick tempo readout for beatmatching
- Finding the BPM of electronic, pop, rock, and hip-hop tracks
- Getting the isolated instrumental stem alongside the BPM for further production
Not ideal for
- Classical music or highly complex, free-tempo jazz (BPM can fluctuate)
- Songs with no clear drum beat or percussion
- Very long tracks (over ~10 to 15 minutes) on phones or low-memory devices
- Stem separation of 4+ stems (drums, bass, other). This tool outputs 2 stems only
Ways to find a song's BPM, compared
There are several ways to find the tempo of a song. AI separation combined with peak detection is the most reliable for modern music because it isolates the drums first.
| Method | Quality | Works best for | Limitations |
|---|---|---|---|
| AI separation + peak detection (this tool) | High: isolates instrumental first, then detects peaks | Most modern songs with clear drums | May normalize half/double time |
| Manual tapping (Tap Tempo) | Medium: depends on user rhythm | Quick, rough estimates | Inaccurate for complex rhythms |
| Standard DAW BPM detection | High | Producers already in their DAW | Requires importing audio and using a heavy desktop app |
| Upload-based online BPM tools | High | Heavier multi-stem models | Requires uploading audio; often account, queue, or paid plan |
BPM glossary: tempo, peak detection, MDX, WebGPU
- BPM
- Beats Per Minute. The unit used to measure the tempo of a song. A higher BPM means a faster song.
- Tempo
- The speed or pace of a given piece of music. It is measured in BPM.
- Peak detection
- An algorithm that scans the audio waveform for sudden spikes in volume, which usually represent drum hits or beats.
- Half-time / Double-time
- Sometimes a song can be counted at half or double its actual BPM (e.g., 70 BPM vs 140 BPM). The AI normalizes to the most common range.
- MDX
- A neural-network architecture for music source separation. This tool uses it to isolate the instrumental, which makes BPM detection much more accurate.
- ONNX Runtime Web
- A library that runs machine-learning models directly in the browser, using WebGPU (GPU) or WebAssembly (CPU).
- WebGPU
- A modern browser API that gives web pages fast access to the graphics card, which makes AI audio separation several times faster than CPU-only processing.
BPM finder not working? Try these fixes
The BPM looks wrong (double or half)
AI tempo detection can sometimes detect a song at half or double its perceived speed. For example, a 140 BPM drum & bass track might be detected as 70 BPM. Tap along to the song and see which matches your feeling.
No BPM is shown
The BPM detector needs a clear drum beat. If the song has no percussion, or is classical/jazz with fluctuating tempo, the detector may return a fallback of 120 BPM or fail to display.
The tool is very slow or freezes
AI processing is heavy. Use a desktop or laptop with a modern GPU and a browser with WebGPU. On phones, long songs can take several minutes or run out of memory.
The first load takes a long time
The tool downloads a ~67MB AI model on first use. It is cached in your browser, so later visits start much faster.
I only want BPM, not the stems
You can ignore the download buttons. Just look at the BPM badge next to the Instrumental track in the player and close the tab.
My file will not load
Use MP3, WAV, or M4A. If your file is a video, extract the audio first with our Video to MP3 tool.
ToolDeck vs upload-based BPM tools
Many online BPM tools upload your music to a server and queue it for GPU processing. ToolDeck keeps your files local and runs the AI in your browser.
| Feature | TToolDeck | Upload-based tools |
|---|---|---|
| Free with no account | Yes | Free tier, account often required |
| No file upload to a server | Yes | No |
| Runs AI locally in browser | Yes | no (server-side GPU) |
| Works offline after first load | Yes | No |
| Detects BPM | Yes | Yes |
| Also separates stems (Vocals/Instrumental) | Yes | No |
| Mobile friendly UI | Yes | Varies |
Competitor features vary by provider and plan. Based on commonly available behaviour; verify each tool before relying on it for professional work.
What you get for free
AI running locally
Powered by ONNX Runtime Web and an MDX-architecture model. Audio is processed in your browser using WebGPU for speed or WASM as a fallback.
Accurate BPM detection
Isolates the instrumental first, then runs peak detection on the waveform for a clean, accurate tempo read.
Bonus stems included
You also get the isolated instrumental and acapella WAV files for free, perfect for DJs and producers.
100% private
Your unreleased tracks and personal recordings stay on your machine. No uploads, no temporary server storage.
Auto-cached model
The ~67MB AI model downloads once and is cached by your browser, so later sessions start fast and can work offline.
High-quality output
Stems export as uncompressed WAV, the best format for importing into a DAW, sampler, or DJ software.
Tips for accurate BPM detection
Tap along to verify
If the BPM seems off, tap the beat on your desk along with the song and use an online tap-tempo tool to compare. This helps catch half-time or double-time detection.
Use a high-quality source
The AI works best with a clean 320kbps MP3 or a WAV file. Low-quality or distorted files give poorer separation and less accurate BPM detection.
Desktop for speed
AI separation benefits from a powerful GPU. A laptop or desktop gives the fastest results, especially for long songs.
Check the instrumental
Listen to the instrumental preview. If the separation is clean, the BPM is likely to be very accurate because the drum beat is isolated.
Respect copyright
Finding the BPM of a song is fine. However, do not distribute or monetize stems or remixes of songs you do not own or have licensed.
How this tool works under the hood
The BPM Finder decodes your audio with the Web Audio API, converts it into a spectrogram, and runs an MDX-architecture neural network through ONNX Runtime Web to isolate the instrumental. With WebGPU it uses your graphics card; otherwise it falls back to WebAssembly on the CPU. A peak-detection algorithm then scans the isolated instrumental for sudden spikes in volume (drum hits), calculates the average interval between peaks, and converts it to BPM. No audio is sent over the network at any point; only the model file is downloaded, once.
BPM Finder FAQ
Quick answers about privacy, accuracy, speed, and formats.
How do I find the BPM of a song for free?
Open the ToolDeck BPM Finder, upload your MP3, WAV, or M4A file, and wait for the AI to separate the instrumental. The detected BPM will appear next to the Instrumental track in the audio player. It is free, needs no account, and your audio is never uploaded.
Is my audio uploaded to a server?
No. The AI model runs inside your browser using ONNX Runtime Web with WebGPU or WebAssembly. Your audio file is never sent to ToolDeck or any third party, so it stays 100% private.
How accurate is the BPM detection?
It is highly accurate for electronic, pop, rock, and hip-hop tracks with a clear drum beat. However, it may sometimes detect half or double the perceived BPM (e.g., 70 vs 140). Always tap along to verify.
Why does it need to separate the vocals first?
BPM detection works best on drums and bass. By isolating the instrumental first, the AI removes the singer's voice and melody, which can confuse the peak-detection algorithm.
Can I find the BPM of a song without drums?
Not reliably. If the song has no clear percussion (like a classical piano piece or a cappella vocal track), the BPM detector may not work correctly.
What output format do I get?
You get the BPM displayed on screen, plus two uncompressed WAV files (Instrumental and Acapella) that you can download for free.
Does it work on iPhone or Android?
Yes, the interface is mobile-friendly, but AI processing can be slow and may run out of memory on older phones. For the best experience use a laptop or desktop.
How large is the first download?
About 67MB for the AI model on first use. Your browser caches it, so later sessions start almost immediately.
Does it work offline?
Yes, once the AI model and page have been cached by your browser. The first load needs an internet connection to download them.
Can I find the BPM of a song from a video?
Yes, in two steps. Extract the audio from your video file with our Video to MP3 tool, then upload that audio to the BPM Finder.
What is the maximum file length?
There is no fixed limit, but files over roughly 10 to 15 minutes can hit browser memory limits. If the tool crashes, split the audio into shorter parts with the MP3 Cutter and process each one.
Which browsers are supported?
Recent versions of Chrome, Edge, Safari, and Firefox. Browsers with WebGPU are fastest; others fall back to WebAssembly and still work.
More free audio and video tools
Extract, compress, or edit media. Nothing uploaded, ever.
Your audio stays on your device
There is no upload step and no account. The AI model is downloaded to your browser and runs locally using WebGPU or WebAssembly. Your music never leaves your device. Read how we keep it private.