AUTHORIZED MEASUREMENT INSTRUMENTSCREEN NOT CALIBRATED

Choose a measurement path.

Both paths create the same editable bitting record. No photograph, measurement, or profile leaves this device.

CURRENT PROFILEDemonstration 5-pin Shoulder

ACTIVE RESULT— — — — —

METHODNot measured

!

Responsible use. Use KEYGAUGE only for keys you own or are authorized to service. Verify every estimate with professional locksmith tools before cutting a key or servicing a lock.

SCREEN CALIBRATION

Establish physical scale

NOT CALIBRATED

1. Choose a reference

2. Match the object

Place the object against the screen, then adjust width and height until the outline matches exactly.

Horizontal size 324 px Vertical size 204 px

HORIZONTAL SCALE—mm / CSS px

VERTICAL SCALE—mm / CSS px

CONFIDENCENot set

DEVICE PIXEL RATIO—

PHYSICAL REFERENCE OUTLINE · PLACE OBJECT HERE

85.60 × 53.98 mm

010 mm

Use full screen and browser zoom at 100%. Calibration remains an estimate affected by the reference object and visual matching.

MEASURE ON SCREEN

Align the physical key

To measure your key

Place the key on top of the screen.
Use the contour to align your key.
Adjust each cut’s depth until the guides match. It is easier if you look with one eye closed.

!

Protect the display. Use only light contact. Consider a thin transparent screen protector.

Key-system profile Orientation Alignment

Screen geometry is uncalibrated. Results will be labeled uncalibrated.

MAGNIFIED CUT

Rotation 0.0° Horizontal offset 0 px Vertical offset 0 px Line thickness 3 px Overlay opacity 90% Overlay color

Cut-depth controls

Snap to valid depths

ANALYZE A PHOTO

Estimate from a visible contour

LOCAL IMAGE PROCESSING

CaptureScaleCorrectAlignDetectVerifyExport

To photograph your key

Place the key on a flat, contrasting surface.
Place a ruler, reference card, or calibration marker beside it.
Keep the key and reference object in the same flat plane.
Position the camera directly above the key.
Make sure the complete blade, shoulder, and tip are visible.
Avoid shadows, glare, blur, and angled photographs.

JPEG, PNG, or WebP · paste or drag and drop also supported

Photo measurements are estimates. Perspective, shadows, wear, image resolution, and an inaccurate scale reference can affect the result. Verify the bitting with professional locksmith tools before cutting or servicing a lock.

Drop a key image here

8× inspection

COORDINATE SPACESOURCE

ANALYSIS SIZE—

POINTER — ANALYSIS—

POINTER — SOURCE—

PHYSICALUNCALIBRATED

01

Scale reference

Reference Known distance mm

Drag the two round scale points over the known distance.

IMAGE SCALEUncalibratedSet both points

02

Perspective & rotation

Place the four square handles around the reference object.

Horizontal scale Vertical scale Keystone

Original geometry

Corrected geometry

MARKER DETECTIONNot runUse Detect marker for a local corner-target search.

CORRECTION RESIDUALNot appliedFour-corner projective transform

IMAGE QUALITY PREFLIGHTNot checkedLoad an image or run the preflight.

03

Align & detect

Key profile Reference Segmentation polarity Sensitivity Mask cleanup

BLADE SEGMENTATIONNot runChoose polarity or Auto, then segment the blade.

Bitted edge

Drag the diamond reference, baseline ends, or any cut point to correct the estimate. Alignment changes are recalculated without discarding prior cut values.

LOCAL RECORDS

Review and compare measurements

EDITABLE RECORD

Current measurement record

EDITOR SAVED

Record nameMeasurement methodManual bittingAsset or job referenceAnonymized identifierTagsNotes

RECORD WORKBENCH

Find, organize, compare, and restore

0 RECORDS

SearchMethodVerificationRequired tagsSort

Saved view

MULTI-RECORD COMPARISON

Compare two or more measurements

0 selected

Select records with the checkboxes in the workbench or with the list below. Comparisons require the same key-system profile.

Measurements

PROFESSIONAL REPORT

Measurement evidence and verification history

PHOTO EXCLUDED

Record

Reports distinguish drafts from finalized verification, preserve decision reasons and notes, and include calibration, perspective, confidence, ambiguity, unreadable-position, and profile-rule evidence. Source photographs are excluded.

Save a measurement record to generate a report.

PRINTABLE WORKSHEETS

Field forms and scale checks

PRINT AT 100%

Screen calibration worksheet Photo checklist Blank bitting form Verification rulers

Print at 100 percent with page fitting disabled. Verify every printed dimension before relying on a worksheet or ruler.

RECOVERY CHECKPOINTS

Compact local project restore points

KEYGAUGE keeps up to five deduplicated checkpoints within a storage budget. Each checkpoint retains the current record state and the three most recent record revisions.

KEY-SYSTEM PROFILES

Profile dimensions and rules

i

Bundled profiles are explicitly demonstration data and are not manufacturer specifications. Enter verified dimensions from an authorized source before professional use.

RELEASE VALIDATION

Validate this browser and installation

NOT RUN

i

Local synthetic checks. This workbench validates deterministic scale, perspective, coordinate, depth-code, privacy, and browser-capability behavior without reading saved records or photographs. It does not certify real-world bitting accuracy.

GOLDEN CHECKS—

BROWSER CAPABILITIES—

PERFORMANCE—

PRIVACY SCRUB—

DETERMINISTIC CORPUS

Measurement checks

Run local validation to check the bundled golden fixture.

CURRENT BROWSER

Capability checks

Capabilities are evaluated without requesting camera permission.

SYNTHETIC RASTER

Performance check

No performance check has run.

DATA BOUNDARY

Privacy check

No record or photo content is inspected by this workbench.

Release evidence and known limits

Use the print sheet at 100 percent with page fitting disabled, then verify its dimensions with a physical ruler. Camera behavior, offline installation, printing, touch input, and real photographs still require manual testing on the target device.

Validation protocol Security boundary Browser matrix

FIELD VALIDATION LAB

Compare a saved measurement with professional-tool ground truth

NO STUDY

!

Characterization, not certification. Reference values are user supplied. A passing study describes only its recorded key, equipment, profile, operator, and conditions; it does not certify future measurements or fitness for cutting a key.

RECORDGROUND TRUTHCRITERIAANALYZEREVIEWREPORT

SAVED STUDIES0

MEETS CRITERIA—

MEAN ABS. ERROR—

WORST ERROR—

Choose a saved record, enter professional-tool reference values, then analyze.

PORTABLE EVIDENCE

Saved field studies

No field validation studies have been saved.

GUIDE, LIMITATIONS & PRIVACY

Use KEYGAUGE responsibly

Batch 9 changelog Download README

Screen method

Calibrate in full screen at 100% browser zoom, select a verified profile, align the shoulder or tip, and adjust each cut. A browser cannot infer true physical size from resolution alone.

Photo method

Keep the scale reference in the same plane as the key. Correct perspective, then verify the baseline, reference, and every cut. Unscaled photos remain explicitly uncalibrated.

Private by design

Processing, autosave, profiles, and records remain in this browser. There is no telemetry, analytics, advertising, remote image analysis, or account.

Professional verification

KEYGAUGE is a visual measurement and documentation aid. Wear, parallax, display calibration, image blur, and unverified profile data can all affect estimates.

LOCAL STORAGE HEALTH

Data durability and offline readiness

PROJECT PAYLOADCalculating…

BROWSER STORAGECalculating…

RETENTION POLICYChecking…

All records remain device-local. Export project backups regularly; clearing browser site data can permanently remove local records.

Local data controls

No photograph is currently stored locally.

Fresh Start permanently removes the project, previous-session copy, recovery checkpoints, calibration, profiles, settings, and authorization acknowledgment. It does not retain a hidden recovery copy.