HAR Viewer
About this tool
Upload or paste an HTTP Archive (HAR) file to analyze the request list, timeline (waterfall), size and status/MIME distributions, and per-domain statistics entirely in your browser. Filter and search the data, and export the table as CSV. All processing happens locally (nothing is uploaded).
Paste HAR JSON
Drag and drop a HAR file here
Summary
Requests
—
Total transfer
—
Overall load time
—
Domains
—
Filter & search
Distribution charts
Status distribution
MIME distribution
Transfer by domain
Timeline (waterfall)
—
Request list
| # | Method | Status | MIME | Domain | Path | Start | Time (ms) | Transfer (KB) |
|---|
How to use
- Select a file or paste HAR JSON, then press [Parse]. Drag and drop is also supported.
- The summary shows total requests, transfer size, overall load time (first start to last finish), and domain count.
- Use “Distribution charts” to review status/MIME/domain transfer trends, and the Timeline to spot parallel versus sequential behavior and bottlenecks.
- Narrow the target with “Filter & search” and export the visible rows as CSV via [Export CSV].
Notes
- Assumes HAR 1.2, the format produced by common browsers and proxies.
- Transfer size prioritizes `entry.response._transferSize` or `entry._transferSize`, then falls back to `response.bodySize` / `content.size`.
- Timing uses `startedDateTime` and `time` (total milliseconds); the overall span is computed from the minimum start and maximum end of all entries.
- Very large HAR files depend on browser memory; split files if you need to inspect hundreds of megabytes.