Free Local utilities

HAR summary

Choose a HAR JSON file, up to 2 MiB and 5,000 requests. Summarize requests, HTTP errors, durations and reported transfer bytes. Headers, URLs, cookies and bodies are not displayed or uploaded.

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Your inputs

Runs in your browser. Inputs and results are not uploaded or saved by this tool. Copy or download only what you intend to keep.

Choose a valid HAR JSON file with at most 5,000 entries and 2 MiB.

Your result

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Your result will appear here

Complete the inputs and run the tool. You can load a safe example to get started.

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Sources

HAR 1.2 · Historical Draft

Sources reviewed: Nov 6, 2026

How it works

Entries with status 400 or above count as errors. Reported body/header sizes are added when present; unknown -1 sizes are skipped. Request durations are summed even when requests overlap.

Assumptions and limitations

Up to 2 MiB and 5,000 entries. This is a local summary, not a waterfall, page-load duration or transfer-size audit. URLs, cookies, headers and bodies are not displayed; sanitize HAR files before sharing them elsewhere.

How to use this tool

Choose a HAR JSON file exported from browser developer tools, then Analyze. Inspect request/error counts, reported bytes and summed request duration. Upload a local file or paste HAR JSON. Filters and sorting affect only the bounded anonymous entry table; the four overview totals still cover all entries. At most 100 rows are shown, with no request URLs, cookies or body content.

Worked example

Demonstration data only. Loading an example replaces the inputs but does not run the tool.

{
  "log": {
    "version": "1.2",
    "entries": [
      {
        "time": 120,
        "response": {
          "status": 200,
          "bodySize": 100,
          "headersSize": 50
        }
      }
    ]
  }
}

Frequently asked questions

What should I check before using this result?

Are my inputs or results saved automatically?

No. Processing stays in this browser and leaving the page clears the tool state. Copied or downloaded results remain under your control. Page-loading and privacy controls are described in the Privacy Policy.

Processing and privacy

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