diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 230d4fd..642c77d 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -25,6 +25,7 @@
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         "svelte": "^5.39.5",
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@@ -33,12 +34,219 @@
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+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.7.tgz",
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+      "funding": [
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+      "license": "MIT",
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@@ -481,6 +689,24 @@
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@@ -1178,9 +1404,9 @@
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@@ -1612,6 +1838,17 @@
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@@ -1619,6 +1856,13 @@
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@@ -1784,6 +2161,16 @@
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@@ -2095,6 +2492,13 @@
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+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/tabbable": {
       "version": "6.2.0",
       "resolved": "https://registry.npmjs.org/tabbable/-/tabbable-6.2.0.tgz",
@@ -4905,6 +5623,23 @@
         "node": ">=6"
       }
     },
+    "node_modules/tinybench": {
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
+      "integrity": "sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tinyexec": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.3.0.tgz",
+      "integrity": "sha512-QKAl9m8gWWGHV8jZcPeym6j+XULi6tOf1mT83WYJ4Lk2ytW/uwAWkrP0uFsdoYMdueVJ0qs26wZ+23xeB4ibNQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.15",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",
@@ -4922,6 +5657,16 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
+    "node_modules/tinyrainbow": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.1.tgz",
+      "integrity": "sha512-yau8yJdTt989Mm0Bd/236QnzEiPf2xLLTqUZRUJOo/3CB078LSwzei343DgtJVmfJKJE3TMINY1u42SQsP6mXw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/tippy.js": {
       "version": "6.3.7",
       "resolved": "https://registry.npmjs.org/tippy.js/-/tippy.js-6.3.7.tgz",
@@ -4931,6 +5676,26 @@
         "@popperjs/core": "^2.9.0"
       }
     },
+    "node_modules/tldts": {
+      "version": "7.4.10",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.4.10.tgz",
+      "integrity": "sha512-GgouD1B+sWwvkaEq8vXC15DjQitxbvs12oIXELpconwm+Tg3zfcEv4jgzq3vtKverDXsg3VI8aRgNL2Nra0Iog==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^7.4.10"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "7.4.10",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.4.10.tgz",
+      "integrity": "sha512-KnQjp53ZekKgm/r3l+u8kJGGzYgrWdP8+Mql7a4vijh2WE0IrZWspQj/TpTxDho/YxO+AnOZnIjQcCD+q6iJsw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/totalist": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/totalist/-/totalist-3.0.1.tgz",
@@ -4941,6 +5706,19 @@
         "node": ">=6"
       }
     },
+    "node_modules/tough-cookie": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.2.tgz",
+      "integrity": "sha512-exgYmnmL/sJpR3upZfXG5PoatXQii55xAiXGXzY+sROLZ/Y+SLcp9PgJNI9Vz37HpQ74WvDcLT8eqm+kV3FzrA==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^7.0.5"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
     "node_modules/tr46": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
@@ -4992,6 +5770,16 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/undici": {
+      "version": "8.10.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-8.10.0.tgz",
+      "integrity": "sha512-HvltHd7avK13QIw/oLe4qoOLyoVSoafqJ2jYOrtMRBkbYT31eiBQ8O0ehRKZiEZCMEyLFQNIADpgCWC5fALvYQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=22.19.0"
+      }
+    },
     "node_modules/unique-filename": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/unique-filename/-/unique-filename-1.1.1.tgz",
@@ -5116,6 +5904,109 @@
         }
       }
     },
+    "node_modules/vitest": {
+      "version": "4.1.10",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.10.tgz",
+      "integrity": "sha512-R9jUTe5S4Qb0HCd4TNqpC7oGcrMssMRGXLW80ubjWsW9VH5GF8y1Y0SFLY9AbqSk6nt0PnOx4H4WNJYZ13GUPw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "4.1.10",
+        "@vitest/mocker": "4.1.10",
+        "@vitest/pretty-format": "4.1.10",
+        "@vitest/runner": "4.1.10",
+        "@vitest/snapshot": "4.1.10",
+        "@vitest/spy": "4.1.10",
+        "@vitest/utils": "4.1.10",
+        "es-module-lexer": "^2.0.0",
+        "expect-type": "^1.3.0",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^4.0.0-rc.1",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.10",
+        "@vitest/browser-preview": "4.1.10",
+        "@vitest/browser-webdriverio": "4.1.10",
+        "@vitest/coverage-istanbul": "4.1.10",
+        "@vitest/coverage-v8": "4.1.10",
+        "@vitest/ui": "4.1.10",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/webidl-conversions": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
@@ -5123,6 +6014,16 @@
       "dev": true,
       "license": "BSD-2-Clause"
     },
+    "node_modules/whatwg-mimetype": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-5.0.0.tgz",
+      "integrity": "sha512-sXcNcHOC51uPGF0P/D4NVtrkjSU2fNsm9iog4ZvZJsL3rjoDAzXZhkm2MWt1y+PUdggKAYVoMAIYcs78wJ51Cw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    },
     "node_modules/whatwg-url": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
@@ -5151,6 +6052,23 @@
         "node": ">= 8"
       }
     },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/wide-align": {
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.5.tgz",
@@ -5169,6 +6087,23 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/yallist": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-5.0.0.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index 04c0425..17bb93b 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -13,6 +13,8 @@
     "prepare": "svelte-kit sync || echo ''",
     "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
     "check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "generate-pocketbase-types": "node scripts/schema-to-json.mjs > .schema.tmp.json && pocketbase-typegen --json .schema.tmp.json --out ./src/lib/types.d.ts && rm -f .schema.tmp.json"
   },
   "devDependencies": {
@@ -26,6 +28,7 @@
     "@tailwindcss/vite": "^4.1.13",
     "bits-ui": "^2.18.1",
     "clsx": "^2.1.1",
+    "jsdom": "^30.0.1",
     "pocketbase-typegen": "^1.3.1",
     "svelte": "^5.39.5",
     "svelte-check": "^4.3.2",
@@ -34,7 +37,8 @@
     "tailwindcss": "^4.1.13",
     "tw-animate-css": "^1.4.0",
     "typescript": "^5.9.2",
-    "vite": "^7.1.7"
+    "vite": "^7.1.7",
+    "vitest": "^4.1.10"
   },
   "dependencies": {
     "date-fns": "^4.1.0",
diff --git a/frontend/src/lib/gpx.test.ts b/frontend/src/lib/gpx.test.ts
new file mode 100644
index 0000000..4058d81
--- /dev/null
+++ b/frontend/src/lib/gpx.test.ts
@@ -0,0 +1,143 @@
+import { describe, it, expect } from 'vitest'
+import { parseGpx, haversine, simplify } from './gpx'
+
+// Zwei Punkte in Hersbruck, rund 1,4 km auseinander.
+const SAMPLE = `<?xml version="1.0"?>
+<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1">
+  <trk><name>Testtrail</name><trkseg>
+    <trkpt lat="49.5100" lon="11.4300"><ele>340</ele></trkpt>
+    <trkpt lat="49.5110" lon="11.4320"><ele>350</ele></trkpt>
+    <trkpt lat="49.5120" lon="11.4340"><ele>345</ele></trkpt>
+    <trkpt lat="49.5130" lon="11.4360"><ele>400</ele></trkpt>
+  </trkseg></trk>
+</gpx>`
+
+describe('haversine', () => {
+    it('misst die Distanz zwischen zwei Punkten in Metern', () => {
+        const d = haversine(
+            { lat: 49.51, lng: 11.43, ele: null },
+            { lat: 49.52, lng: 11.43, ele: null },
+        )
+        // 0,01 Grad Breite sind rund 1112 m
+        expect(d).toBeGreaterThan(1100)
+        expect(d).toBeLessThan(1125)
+    })
+
+    it('liefert 0 für identische Punkte', () => {
+        const p = { lat: 49.51, lng: 11.43, ele: null }
+        expect(haversine(p, p)).toBe(0)
+    })
+})
+
+describe('parseGpx', () => {
+    it('liest alle Trackpunkte', () => {
+        const r = parseGpx(SAMPLE)
+        expect(r.points).toHaveLength(4)
+        expect(r.points[0]).toEqual({ lat: 49.51, lng: 11.43, ele: 340 })
+    })
+
+    it('berechnet eine plausible Streckenlänge', () => {
+        const r = parseGpx(SAMPLE)
+        expect(r.distance_m).toBeGreaterThan(400)
+        expect(r.distance_m).toBeLessThan(700)
+    })
+
+    it('zählt nur Anstiege über der Rauschschwelle', () => {
+        const r = parseGpx(SAMPLE)
+        // +10 (340→350), -5 (350→345, zählt nicht), +55 (345→400) = 65
+        expect(r.ascent_m).toBe(65)
+    })
+
+    it('ignoriert Höhenschwankungen unter 3 m', () => {
+        const noisy = `<?xml version="1.0"?>
+<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1"><trk><trkseg>
+  <trkpt lat="49.510" lon="11.430"><ele>300</ele></trkpt>
+  <trkpt lat="49.511" lon="11.431"><ele>301</ele></trkpt>
+  <trkpt lat="49.512" lon="11.432"><ele>302</ele></trkpt>
+  <trkpt lat="49.513" lon="11.433"><ele>303</ele></trkpt>
+</trkseg></trk></gpx>`
+        // Lauter 1-m-Schritte: reines GPS-Rauschen, kein echter Anstieg
+        expect(parseGpx(noisy).ascent_m).toBe(0)
+    })
+
+    it('liefert die Bounding-Box als [[minLng,minLat],[maxLng,maxLat]]', () => {
+        const r = parseGpx(SAMPLE)
+        expect(r.bounds).toEqual([[11.43, 49.51], [11.436, 49.513]])
+    })
+
+    it('liefert GeoJSON mit [lng, lat] in dieser Reihenfolge', () => {
+        const r = parseGpx(SAMPLE)
+        expect(r.geojson.type).toBe('LineString')
+        expect(r.geojson.coordinates[0]).toEqual([11.43, 49.51])
+    })
+
+    it('liefert ein Höhenprofil mit aufsummierter Distanz', () => {
+        const r = parseGpx(SAMPLE)
+        expect(r.elevation).toHaveLength(4)
+        expect(r.elevation[0]).toEqual({ d: 0, ele: 340 })
+        expect(r.elevation[3].d).toBeCloseTo(r.distance_m, 0)
+    })
+
+    it('kommt mit fehlenden Höhenangaben zurecht', () => {
+        const noEle = `<?xml version="1.0"?>
+<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1"><trk><trkseg>
+  <trkpt lat="49.510" lon="11.430"/>
+  <trkpt lat="49.511" lon="11.431"/>
+</trkseg></trk></gpx>`
+        const r = parseGpx(noEle)
+        expect(r.points[0].ele).toBeNull()
+        expect(r.ascent_m).toBe(0)
+        expect(r.elevation).toHaveLength(0)
+    })
+
+    it('greift auf Routenpunkte zurück, wenn Trackpunkte fehlen', () => {
+        const route = `<?xml version="1.0"?>
+<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1"><rte>
+  <rtept lat="49.510" lon="11.430"><ele>300</ele></rtept>
+  <rtept lat="49.511" lon="11.431"><ele>310</ele></rtept>
+</rte></gpx>`
+        expect(parseGpx(route).points).toHaveLength(2)
+    })
+
+    it('wirft bei einer Datei ohne Punkte', () => {
+        const empty = `<?xml version="1.0"?>
+<gpx version="1.1" xmlns="http://www.topografix.com/GPX/1/1"></gpx>`
+        expect(() => parseGpx(empty)).toThrow(/keine Punkte/i)
+    })
+
+    it('wirft bei ungültigem XML', () => {
+        expect(() => parseGpx('kein xml')).toThrow(/ung(ü|ue)ltig/i)
+    })
+})
+
+describe('simplify', () => {
+    it('lässt kurze Punktfolgen unangetastet', () => {
+        const pts = [
+            { lat: 49.51, lng: 11.43, ele: null },
+            { lat: 49.52, lng: 11.44, ele: null },
+        ]
+        expect(simplify(pts, 100)).toHaveLength(2)
+    })
+
+    it('reduziert lange Punktfolgen auf das Maximum', () => {
+        const pts = Array.from({ length: 5000 }, (_, i) => ({
+            lat: 49.5 + i * 0.0001,
+            lng: 11.4 + Math.sin(i / 50) * 0.01,
+            ele: null,
+        }))
+        const out = simplify(pts, 500)
+        expect(out.length).toBeLessThanOrEqual(500)
+        expect(out.length).toBeGreaterThan(10)
+    })
+
+    it('behält Anfang und Ende bei', () => {
+        const pts = Array.from({ length: 1000 }, (_, i) => ({
+            lat: 49.5 + i * 0.001,
+            lng: 11.4 + i * 0.001,
+            ele: null,
+        }))
+        const out = simplify(pts, 50)
+        expect(out[0]).toEqual(pts[0])
+        expect(out[out.length - 1]).toEqual(pts[pts.length - 1])
+    })
+})
diff --git a/frontend/src/lib/gpx.ts b/frontend/src/lib/gpx.ts
new file mode 100644
index 0000000..6d3264f
--- /dev/null
+++ b/frontend/src/lib/gpx.ts
@@ -0,0 +1,197 @@
+/**
+ * GPX-Verarbeitung im Browser.
+ *
+ * Das Backend bleibt reines PocketBase ohne Hooks: Beim Upload liest das
+ * Frontend die Datei, rechnet Länge, Höhenmeter und Bounding-Box aus und
+ * schickt Originaldatei plus abgeleitete Werte gemeinsam an die API.
+ */
+
+export type TrackPoint = { lat: number; lng: number; ele: number | null }
+
+export type ParsedGpx = {
+    points: TrackPoint[]
+    geojson: { type: 'LineString'; coordinates: [number, number][] }
+    elevation: { d: number; ele: number }[]
+    bounds: [[number, number], [number, number]]
+    distance_m: number
+    ascent_m: number
+}
+
+/** Erdradius in Metern */
+const R = 6_371_000
+
+/**
+ * Anstiege unterhalb dieser Schwelle gelten als GPS-Rauschen. Ohne sie
+ * summieren sich Messfehler zu absurden Höhenmetern — ein flacher Waldweg
+ * käme leicht auf mehrere hundert Meter.
+ */
+const ELE_NOISE_M = 3
+
+/** Distanz zweier Punkte in Metern (Haversine). */
+export function haversine(a: TrackPoint, b: TrackPoint): number {
+    const toRad = (d: number) => (d * Math.PI) / 180
+    const dLat = toRad(b.lat - a.lat)
+    const dLng = toRad(b.lng - a.lng)
+    const lat1 = toRad(a.lat)
+    const lat2 = toRad(b.lat)
+
+    const h =
+        Math.sin(dLat / 2) ** 2 +
+        Math.sin(dLng / 2) ** 2 * Math.cos(lat1) * Math.cos(lat2)
+
+    return 2 * R * Math.asin(Math.sqrt(h))
+}
+
+/**
+ * Douglas-Peucker: entfernt Punkte, die kaum von der Verbindungslinie ihrer
+ * Nachbarn abweichen. Die Toleranz wird verdoppelt, bis das Ergebnis unter
+ * maxPoints liegt — so bleibt die Form erhalten, während die Datenmenge
+ * beherrschbar wird.
+ */
+export function simplify(points: TrackPoint[], maxPoints = 2000): TrackPoint[] {
+    if (points.length <= maxPoints) return points
+
+    let tolerance = 0.00001
+    let out = points
+
+    // Obergrenze gegen Endlosschleifen bei entarteten Daten
+    for (let i = 0; i < 30 && out.length > maxPoints; i++) {
+        out = douglasPeucker(points, tolerance)
+        tolerance *= 2
+    }
+
+    return out
+}
+
+function douglasPeucker(pts: TrackPoint[], tolerance: number): TrackPoint[] {
+    if (pts.length < 3) return pts
+
+    let maxDist = 0
+    let index = 0
+
+    for (let i = 1; i < pts.length - 1; i++) {
+        const d = perpendicularDistance(pts[i], pts[0], pts[pts.length - 1])
+        if (d > maxDist) {
+            maxDist = d
+            index = i
+        }
+    }
+
+    if (maxDist <= tolerance) return [pts[0], pts[pts.length - 1]]
+
+    const left = douglasPeucker(pts.slice(0, index + 1), tolerance)
+    const right = douglasPeucker(pts.slice(index), tolerance)
+    return [...left.slice(0, -1), ...right]
+}
+
+/**
+ * Abstand eines Punktes zur Geraden durch start und end — in Grad, nicht in
+ * Metern. Für den Vergleich innerhalb eines Tracks genügt das und spart die
+ * teure Projektion.
+ */
+function perpendicularDistance(p: TrackPoint, start: TrackPoint, end: TrackPoint): number {
+    const dx = end.lng - start.lng
+    const dy = end.lat - start.lat
+
+    if (dx === 0 && dy === 0) {
+        return Math.hypot(p.lng - start.lng, p.lat - start.lat)
+    }
+
+    const t =
+        ((p.lng - start.lng) * dx + (p.lat - start.lat) * dy) / (dx * dx + dy * dy)
+    const clamped = Math.max(0, Math.min(1, t))
+
+    return Math.hypot(
+        p.lng - (start.lng + clamped * dx),
+        p.lat - (start.lat + clamped * dy),
+    )
+}
+
+/**
+ * Liest eine GPX-Datei. Wirft mit einer für Nutzer verständlichen Meldung,
+ * wenn die Datei kein gültiges XML ist oder keine Punkte enthält.
+ */
+export function parseGpx(xml: string): ParsedGpx {
+    const doc = new DOMParser().parseFromString(xml, 'application/xml')
+
+    if (doc.querySelector('parsererror')) {
+        throw new Error('Die Datei ist ungültig.')
+    }
+
+    // Manche Programme exportieren Routen (rtept) statt Tracks (trkpt).
+    let nodes = Array.from(doc.getElementsByTagName('trkpt'))
+    if (nodes.length === 0) {
+        nodes = Array.from(doc.getElementsByTagName('rtept'))
+    }
+
+    if (nodes.length === 0) {
+        throw new Error('Die GPX-Datei enthält keine Punkte.')
+    }
+
+    const points: TrackPoint[] = []
+    for (const n of nodes) {
+        const lat = Number(n.getAttribute('lat'))
+        const lng = Number(n.getAttribute('lon'))
+        if (!Number.isFinite(lat) || !Number.isFinite(lng)) continue
+
+        const eleText = n.getElementsByTagName('ele')[0]?.textContent
+        const ele = eleText != null && eleText.trim() !== '' ? Number(eleText) : null
+
+        points.push({ lat, lng, ele: Number.isFinite(ele as number) ? ele : null })
+    }
+
+    if (points.length === 0) {
+        throw new Error('Die GPX-Datei enthält keine Punkte.')
+    }
+
+    // Länge, Höhenprofil und Höhenmeter in einem Durchlauf
+    let distance = 0
+    let ascent = 0
+    const elevation: { d: number; ele: number }[] = []
+    let lastCountedEle: number | null = points[0].ele
+
+    if (points[0].ele != null) elevation.push({ d: 0, ele: points[0].ele })
+
+    for (let i = 1; i < points.length; i++) {
+        distance += haversine(points[i - 1], points[i])
+
+        const ele = points[i].ele
+        if (ele == null) continue
+
+        elevation.push({ d: Math.round(distance), ele })
+
+        if (lastCountedEle == null) {
+            lastCountedEle = ele
+        } else {
+            const delta = ele - lastCountedEle
+            if (delta > ELE_NOISE_M) {
+                ascent += delta
+                lastCountedEle = ele
+            } else if (delta < -ELE_NOISE_M) {
+                // Abstieg über Schwelle: neuer Bezugspunkt, aber nicht gezählt
+                lastCountedEle = ele
+            }
+            // Kleine Schwankungen (-3...+3) ignorieren, Bezugspunkt bleibt
+        }
+    }
+
+    const lats = points.map((p) => p.lat)
+    const lngs = points.map((p) => p.lng)
+
+    const simplified = simplify(points)
+
+    return {
+        points: simplified,
+        geojson: {
+            type: 'LineString',
+            coordinates: simplified.map((p) => [p.lng, p.lat] as [number, number]),
+        },
+        elevation,
+        bounds: [
+            [Math.min(...lngs), Math.min(...lats)],
+            [Math.max(...lngs), Math.max(...lats)],
+        ],
+        distance_m: Math.round(distance),
+        ascent_m: Math.round(ascent),
+    }
+}
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index 4df9c30..22c9dd3 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -11,4 +11,7 @@ export default defineConfig({
         strictPort: true,
         open: `http://${pkg.name}.localhost:31337`,
     },
-})
\ No newline at end of file
+    test: {
+        environment: 'jsdom',
+    },
+} as any)
\ No newline at end of file