HAR File Viewer
Explore a browser network recording without uploading it or replaying requests. Sensitive values stay hidden until you explicitly reveal a selected request.
HAR files can contain passwords, session cookies and personal data. Everything stays in this browser; nothing is uploaded or executed. Header values, cookies, every query value and bodies are hidden until you explicitly reveal a selected request. Revealed details may expose secrets on screen. URLs and header names can still contain sensitive information. Exports include numeric summaries only, never URLs, headers or bodies.
HAR 1.2 only · 5 MiB maximum · 20,000 requests maximum. Response bytes use bodySize, or content.size when unknown; this is not total wire traffic. Observed load duration spans the earliest request start to latest request end. Waterfall bars share that time scale. Up to 100 matching requests appear per page.
Request details
A QUICK WALKTHROUGH
How to use this tool
- Choose a HAR file or paste HAR 1.2 JSON, up to 5 MiB and 20,000 requests.
- Sort by duration, size or status, filter slow requests, and inspect the waterfall.
- Select a request for redacted details; reveal sensitive details only if needed. Copy or download the numeric summary.
Local, bounded inspection
Supports HAR 1.2 JSON up to 5 MiB and 20,000 requests. Parsing happens in this browser. No uploads, requests, scripts or response content are executed. Matching requests are paginated in groups of 100.
Sensitive information
HAR may contain credentials and personal data. All header values, cookies, query values and request/response bodies are hidden by default. Explicit reveal displays source details as text. URLs and header names may still contain secrets; inspect privately.
Redacted exports
Exports contain only request counts, numeric request IDs, status codes, response bytes, durations and start offsets. They never contain URLs, headers or bodies, even after you reveal a request. Response bytes are not total wire traffic.
GOOD TO KNOW
Common questions
Is my HAR uploaded?
No. The file stays in this browser and requests are never replayed.
Can I export raw request details?
No. Only numeric summaries can be copied or downloaded.
What does the waterfall measure?
Each bar shows a request start offset and duration on the recording’s shared time scale.