Sada Files
  1. 1Choose file
  2. 2Adjust
  3. 3Download

Check a public page

Enter a URL in the settings and run the check. Our server fetches the page through an SSRF-safe fetcher, analyses it in memory and stores nothing.

Fetched by our server — public addresses only, nothing stored or logged.

Website Cache & Compression Auditor online, free

Analyze HTTP cache headers (Cache-Control, ETag, max-age) and content compression ratios (Brotli, Gzip, Zstandard).

  • Runs in your browser — no upload
  • Free, no sign-up, no watermark
  • HTML
  • TXT
How to use Website Cache & Compression Auditor · Website Cache & Compression Auditor — frequently asked questions

How to use Website Cache & Compression Auditor

  1. 1

    Add your HTML and TXT file

    Drop a file on the page, paste it, or click Select Files. Nothing is uploaded — it opens straight in your browser.

  2. 2

    Fine-tune the settings

    Set source mode in the Fine-tune panel, or keep the defaults — they suit most files.

  3. 3

    Run Website Cache & Compression Auditor

    Press the start button. Processing happens on your device, usually in seconds.

  4. 4

    Download the result

    Save the finished file, or continue with another tool without downloading in between.

What Website Cache & Compression Auditor can do

  • Source Mode: url and paste
  • Private by design — files are processed in your browser and never uploaded
  • Free with no sign-up, no watermark and no daily limit

Website Cache & Compression Auditor — frequently asked questions

Why is HTTP caching crucial for website performance?

HTTP caching directives instruct client browsers and CDN edge caches to store static assets (images, CSS, JS) locally. This eliminates redundant server requests on repeat visits, speeds up page load times to under 100 milliseconds, and reduces bandwidth costs.

What compression algorithms does this tool verify?

The auditor checks for modern Brotli (`br`) compression, standard Gzip (`gzip`), and Zstandard (`zstd`), comparing the uncompressed versus compressed payload size.

What Cache-Control directives does this audit check?

The audit evaluates `max-age`, `s-maxage`, `public`, `private`, `no-cache`, `no-store`, `must-revalidate`, `immutable`, and `stale-while-revalidate` directives to ensure optimal freshness and caching longevity.

What is an ETag and how does it prevent unnecessary downloads?

An Entity Tag (ETag) is a unique hash representing the exact version of a file. When a browser requests a cached file, it sends an `If-None-Match` header. If the file has not changed, the server answers with HTTP `304 Not Modified` with zero payload body.

Does Sada Files log the checked websites?

No. In compliance with our zero-retention policy, no query logs, IP addresses, or header data are stored.

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