Upload a HAR file exported from your browser DevTools to inspect requests, sizes, rich JSON viewer, and timings with a clear waterfall view.
Visualize when requests start and how long they take, grouped by MIME type color.
Filterable list with method, path, status, type, time, and size.
Totals for duration, requests, transfer size, and top domains.
Code and Tree modes for headers, payloads, and bodies with syntax highlighting.
Smart formatting path with Web Worker fallback for big JSON blocks.
Expand filters and the waterfall timeline to focus on deep investigations.
One‑click copy for headers, payloads, and response bodies.
Type, Domain, and URL search filters to isolate the right requests fast.
Runs entirely in your browser — no uploads, no servers, no tracking.
Spot long requests, waterfall gaps, and heavy domains.
Identify third-party hosts slowing down your page.
Compare HARs across deploys to catch performance regressions.
Teach network waterfalls and request lifecycles to teams.
A HAR (HTTP Archive) is a JSON log of all HTTP requests your page makes. This viewer transforms it into an easy‑to‑read report with a waterfall timeline and per‑request details — entirely in your browser for privacy.
Document, Script, Stylesheet, Image, Font, API/XHR, Other.
Limit to a hostname to isolate third‑party impact.
Find requests by URL substring quickly.
Expand filters + waterfall for deep analysis.
Find slowest requests and blocking phases to speed up your pages.
Inspect exact headers and payloads for failed or unexpected calls.
Measure the cost of external scripts, trackers and SDKs.
Runs 100% client‑side — your HAR never leaves your device.
Attach HARs to bug reports to reproduce and fix faster.
Teach network waterfalls and request lifecycles to teams.
DNS
Domain lookup time before connecting to the server.
TTFB
Time to First Byte — server processing + network latency.
MIME Type
Content type of a response, e.g., text/html or application/json.
Caching
How resources are stored and re‑used to avoid repeat downloads.