{
  "benchmark": "30-minute browser audio cutter test",
  "version": 1,
  "tested_at": "2026-09-19",
  "canonical_article": "https://audiomulticut.com/articles/browser-audio-cutter-benchmark-2026",
  "method": {
    "timer_start": "Immediately before opening the file chooser for the local fixture.",
    "timer_stop": "When the 30:00 duration and usable cutting controls were visibly verified.",
    "runs_per_tool": 1,
    "notes": [
      "Times include automation and visual-verification latency.",
      "Upload-based tools include network transfer and server preparation.",
      "This is a reproducible observation, not a statistical performance ranking."
    ]
  },
  "environment": {
    "device": "2024 MacBook Pro",
    "chip": "Apple M4 Max",
    "cpu_cores": 14,
    "memory_gb": 36,
    "operating_system": "macOS 26.6.2",
    "browser": "Chromium 153 in-app browser",
    "network": "Uncontrolled; no throughput normalization was applied"
  },
  "fixtures": [
    {
      "id": "spoken-30m-mp3",
      "purpose": "Shared stopwatch fixture",
      "source": "First 30 minutes of the Project Gutenberg / LibriVox public-domain recording of At The Bay by Katherine Mansfield, read by Luci Burgoyne",
      "source_url": "https://www.gutenberg.org/files/20267/20267-index.html",
      "duration_seconds": 1800,
      "size_bytes": 14400814,
      "codec": "MP3",
      "sample_rate_hz": 44100,
      "channels": 1,
      "bit_rate_bps": 64003,
      "sha256": "a1573793b1fc53afb0ca8cc90a865966e3de42bc97e656d6be4c15022190e7c6"
    },
    {
      "id": "synthetic-stereo-60m-mp3",
      "purpose": "AudioMultiCut-only long-file validation; not a cross-tool comparison",
      "duration_seconds": 3600,
      "size_bytes": 43200828,
      "codec": "MP3",
      "sample_rate_hz": 44100,
      "channels": 2,
      "bit_rate_bps": 96001,
      "sha256": "32151f3036ecfff17cfa28336896e2b08e9aa0466611c3430a156b83558e8360"
    }
  ],
  "results": [
    {
      "tool": "AudioMultiCut",
      "url": "https://audiomulticut.com/split",
      "fixture_id": "spoken-30m-mp3",
      "time_to_verified_editable_state_ms": 1398,
      "processing_path": "Local browser decode; normal editing did not upload the source audio to AudioMultiCut servers",
      "account_required_to_reach_editor": false,
      "multi_segment_observation": "Created three equal 600-second segments and kept all three in one editor state",
      "batch_export_observation": "Inconclusive: an automated three-clip MP3 ZIP check did not expose a capturable download event within 120000 ms, while the editor returned to ready state"
    },
    {
      "tool": "123apps Audio Cutter (Mp3Cut)",
      "url": "https://mp3cut.net/",
      "fixture_id": "spoken-30m-mp3",
      "time_to_verified_editable_state_ms": 48398,
      "processing_path": "Upload workflow; the current privacy policy describes temporary server storage",
      "account_required_to_reach_editor": false,
      "multi_segment_observation": "The tested cutter interface exposed one start-to-end interval"
    },
    {
      "tool": "AudioTrimmer",
      "url": "https://audiotrimmer.com/",
      "fixture_id": "spoken-30m-mp3",
      "time_to_verified_editable_state_ms": 216145,
      "processing_path": "Upload workflow; the page says uploaded files are removed from the server within two hours",
      "account_required_to_reach_editor": false,
      "multi_segment_observation": "The tested cutter interface exposed one keep-or-remove interval"
    }
  ],
  "additional_checks": [
    {
      "tool": "AudioMultiCut",
      "fixture_id": "synthetic-stereo-60m-mp3",
      "time_to_verified_editable_state_ms": 4160,
      "scope": "Local long-file validation only"
    },
    {
      "tool": "Clideo Audio Cutter",
      "url": "https://clideo.com/cut-audio",
      "status": "Excluded from timing",
      "reason": "The file-picker handoff did not operate in the automation session; no timing result was inferred"
    }
  ],
  "corrections": {
    "contact": "https://audiomulticut.com/contact",
    "requested_evidence": [
      "Browser and operating system",
      "Fixture SHA-256",
      "Observed editor state",
      "Test date"
    ]
  }
}