Browser Storage Inspector
Browser Storage Inspector view web storage keys inspect origin storage local storage size report- localStorage entries
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- sessionStorage entries
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- Approximate UTF-16 bytes
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See Web Storage available to this page
Select Inspect this site's storage to list localStorage and sessionStorage keys, character counts, and approximate UTF-16 bytes. Inspection is read-only; the tool does not add, edit, or delete entries.
Two storage lifetimes
localStorage normally remains for the origin across browser restarts until cleared or evicted. sessionStorage belongs to a browsing-tab session and is generally discarded when that tab closes. Both store string keys and string values. Applications often serialize structured data as JSON, but this report treats every value as plain text.
What the size estimate means
The report adds JavaScript string lengths for each key and value, then multiplies by two for an approximate UTF-16 byte count. That is a useful comparison, not actual disk usage. Browser encoding, metadata, compression, quotas, and internal storage structures can produce a different physical size.
Worked example
If localStorage contains key “theme” with value “dark”, the entry has nine JavaScript code units: five in the key and four in the value. The report estimates 18 UTF-16 bytes. A sessionStorage key “step” with value “2” adds five more code units, or roughly 10 bytes.
Origin boundaries matter
Web Storage is isolated by origin, which combines scheme, host, and port. This page can inspect storage for Awesome Tools at its current origin only. It cannot see another website, a different subdomain or port, a browser extension, or another browser profile. Private browsing and browser policies may also change availability.
Limitations and privacy
No report is uploaded, and inspection performs no write or removal. Values appear visibly in the report, so review them before copying or sharing; application storage can contain personal or sensitive data. The tool does not inspect cookies, IndexedDB, Cache Storage, service-worker caches, server sessions, passwords, autofill data, or browser history. It cannot guarantee quota or persistence.
Browser Storage FAQ
Why is the report empty?
This origin may have no entries, or browser policy may block access.
Can this clear localStorage?
No. Read-only scope prevents accidental site-state deletion.
Is the byte count exact?
No. It is a transparent UTF-16 string estimate, not measured disk usage.