Free Webhook Load Tester

Stress test any HTTP endpoint from your browser. Set RPS and duration, send custom payloads, and watch live throughput, latency percentiles, and status codes.

⚠ Only test endpoints you own or have explicit permission to test. Requests are sent directly from your browser (your IP, not ours). Unauthorized load testing of third-party services may violate their terms of service or applicable law.

Target

URL

Method Mode

Measures real status codes and latency. Requires the target to send Access-Control-Allow-Origin headers.

Headers (one per line, Key: Value) Body

Load profile

Requests / sec Duration (s) Timeout (ms)

Advanced

Max in-flight Hard cap on concurrent requests. Ramp-up (s) Gradually increase RPS over this period.

Idle

Live results

—

Sent

0 in-flight

2xx OK

—

Errors

—

Current RPS

target —

p50 latency

—

p95 latency

—

p99 latency

—

Max

—

Throughput (RPS)0

Latency (ms, p95)—

Status codes

No requests yet

Recent errors

No errors

All traffic is sent directly from your browser — your machine, your IP, your network. online-webhooks.com never sees the target URL or the requests. Useful complement: generate a capture URL here, then point this load tester at it to measure how the tester itself performs end-to-end.