HAR File Analyzer
Analyze HTTP Archive (HAR) files to inspect requests, timings, status codes, and performance. Use this free online tool directly in your browser.
What is HAR File Analyzer?
An HTTP Archive (HAR) file is a JSON-format log of all network requests made by a browser during a session. Chrome, Firefox, and Safari DevTools all support exporting HAR files from the Network panel. HAR files contain request and response headers, timing breakdowns (DNS, TCP connect, time-to-first-byte, download), response bodies, and status codes for every resource. This analyzer parses your HAR file locally in the browser — your network data never leaves your device — and gives you a sortable, filterable request list, per-request timing breakdown, error detection, and a summary of total size, total load time, and request distribution by content type. Use it to diagnose slow pages, identify large resources, debug failed API calls, and share network traces with teammates.
How to use
- 1
Paste or enter your data in the HAR File Analyzer input area.
- 2
Run the conversion, generation, or validation action.
- 3
Copy or download the result for your project workflow.
Common Use Cases
- 1
Identify the slowest network requests on a page to prioritize performance optimization work
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Detect failed API calls (4xx/5xx responses) in a recorded browsing session for debugging
- 3
Measure total page weight and identify the largest resources contributing to load time
- 4
Share a HAR export with a teammate or support team to reproduce a network issue
- 5
Inspect request and response headers for a specific API call without using browser DevTools
Try an Example
Upload your .har file to analyze requests, timings, and errors.
Example Input
Export a HAR from Chrome DevTools → Network tab → right-click → Save all as HAR.
Frequently Asked Questions
What is HAR File Analyzer?
HAR File Analyzer is a free browser-based utility on Bite Size Tools. Analyze HTTP Archive (HAR) files to inspect requests, timings, status codes, and performance.
Is HAR File Analyzer safe to use with sensitive data?
Yes. Tool processing runs in your browser, so your input is not sent to a server by default in this app.
Can I use HAR File Analyzer for production work?
Yes. You can use the output directly in development and production workflows after validating it with your project requirements.