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Runs privately in your browser

Free Online Heading Structure Checker

Inspect H1–H6 order in pasted HTML.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result



How to use Heading Structure Checker
Inspect H1–H6 order in pasted HTML. The operation runs locally on this device with a 200 KB input limit. Copy or download the output to keep it; no input text is sent to the tool server.
  1. Set Input.
  2. Run the tool, review the result and its stated limitations, then copy or download if needed.
Example & practical use
Inspect H1–H6 order in pasted HTML. The example below demonstrates Input.
Example input:
{
  "text": "<h1>Title</h1><h3>Skipped</h3>"
}
Expected result (relevant fields):
{
  "h1Count": 1
}
Features & result limitations
The operation runs locally on this device with a 200 KB input limit. Copy or download the output to keep it; no input text is sent to the tool server.
Frequently asked questions
What inputs does Heading Structure Checker accept?
Input
How should I interpret the Heading Structure Checker result?
The operation runs locally on this device with a 200 KB input limit. Copy or download the output to keep it; no input text is sent to the tool server.
Where does Heading Structure Checker process my data?
Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.