SFZ Sampler Builder Online
Turn loose samples into a playable instrument. Detect roots, edit key and velocity zones, hear the mapping on a keyboard and export a real SFZ package with WAV files.
MUSICAL GRID MAP
Sampler Keymap View
Connect detected or generated events to a musical grid. Pitch, rhythm and harmony become useful only when event timing, confidence and editable musical labels stay visible together.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
- Local sample set
Start with the right material
Building a lightweight sampler instrument from chromatic multisamples, one-shots, field recordings or a few pitched sources without installing a desktop editor.
- Map keys and velocities
Understand the transformation
Filename note labels seed root-key suggestions, editable key and velocity boundaries resolve every region, and local keyboard audition transposes decoded PCM from the chosen root while coverage feedback exposes gaps and overlaps.
- Portable SFZ pack
Verify the usable result
A valid text SFZ definition plus source WAV files and a JSON mapping manifest in one local ZIP package.
Where this workflow stops
Pitch estimation and filename parsing are starting points, not musical ground truth. The browser preview does not emulate every SFZ opcode or guarantee identical playback in every sampler, so the exported instrument still needs testing in its target engine.
Make the final decision by ear
- Confirm tempo, downbeat and key before trusting labels.
- Review low-confidence events by ear and correct them manually.
- Import the result into its target instrument or DAW before committing.
- Smart roots
- Filename note tokens take priority, followed by bounded pitch estimation and editable fallback notes.
- Playable mapping
- Inspect coverage and collisions, set audition velocity and play mapped samples over a responsive keyboard.
- Complete delivery
- Export one valid SFZ or a ZIP with finite PCM WAV files and a machine-readable region manifest.
How to build an SFZ sampler instrument
- Choose several local samples or generate the authored C3, E3 and G3 demo.
- Run Auto-map to detect roots and create neighboring key regions.
- Edit root, low/high keys, velocity bounds, tuning, gain and loop mode; inspect collisions and audition the keyboard.
- Download the SFZ text or a complete ZIP containing the definition, conditioned WAV copies and JSON manifest.
A playable instrument, not only a sample folder
Sample Pack Builder cleans and names independent files. SFZ Sampler Builder adds the musical mapping layer: every WAV receives a root pitch and bounded key/velocity region that a compatible sampler can play chromatically. The visible coverage lane exposes empty keys and overlaps before export.
Detection and compatibility limits
- Filename tokens such as C3, Eb4 or F#2 are more reliable than pitch estimation. Percussion, chords and noisy attacks may need a manual root.
- Pitch fallback uses a short bounded autocorrelation window and does not claim studio-grade polyphonic pitch detection.
- The export uses common SFZ 1 region opcodes. Samplers can interpret loop behavior or unsupported extensions differently.
- WAV files in the ZIP are finite decoded PCM16 copies; compressed source metadata and proprietary loop chunks are not preserved.
SFZ Sampler Builder: quick answer and technical limits
Quick answer: A browser-based instrument authoring desk that maps several local samples across MIDI key and velocity zones and packages those mappings as a playable SFZ definition.
- Best for
- Building a lightweight sampler instrument from chromatic multisamples, one-shots, field recordings or a few pitched sources without installing a desktop editor.
- How it works
- Filename note labels seed root-key suggestions, editable key and velocity boundaries resolve every region, and local keyboard audition transposes decoded PCM from the chosen root while coverage feedback exposes gaps and overlaps.
- What you get
- A valid text SFZ definition plus source WAV files and a JSON mapping manifest in one local ZIP package.
Know before you use it: Pitch estimation and filename parsing are starting points, not musical ground truth. The browser preview does not emulate every SFZ opcode or guarantee identical playback in every sampler, so the exported instrument still needs testing in its target engine.
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