HAR File Viewer and Analyzer
Inspect HAR files locally to analyze requests, payload sizes, and timings.
Open or paste a browser HAR export to review request volume, timing, domains, large payloads, status codes, and cache behavior without uploading the file.
Use this for performance reviews, support handoffs, and release investigations. If a HAR contains cookies, tokens, form fields, or private URLs, sanitize it before sharing reports or screenshots.
Choose how the request list is arranged in the waterfall output.
Limit the largest-request report so long traces remain readable.
Requests at or above this duration are highlighted in the summary.
How to use
Export a HAR file from your browser network tools, then open the file or paste its JSON. Select Analyze HAR to create a timing waterfall, group requests by domain, list the largest transfers, and summarize cache signals.
The waterfall uses each entry's started time and total duration to make request order and overlap easier to scan in text form. Domain grouping helps spot third-party concentration, repeated hosts, and payload-heavy origins.
The largest request list ranks transfer, body, and header byte counts where the HAR includes them. The cache summary counts status codes, cache-related headers, and entries that report cache metadata.
HAR files often contain private URLs, cookies, headers, account identifiers, and submitted data. This tool runs locally in your browser and does not upload your file, but you should still redact sensitive traces before sharing any output.
