LocalStorage Size
Estimate how much localStorage this origin is using — keys and approximate UTF-16 bytes.
Processing: runs in your browser, nothing uploaded
About LocalStorage Size
When something on your device misbehaves, a quick in-browser check saves guesswork. LocalStorage Size is built for that job: estimate how much localStorage this origin is using — keys and approximate UTF-16 bytes.
If the test fails
Check OS settings, tab mute, extensions, and whether another app has exclusive device access. Retry after a click if the browser blocked autoplay or permission prompts.
What LocalStorage Size checks
Estimate how much localStorage this origin is using — keys and approximate UTF-16 bytes. Results describe this browser and device only — useful for isolating mute switches, permissions, and display quirks.
Where your data goes
LocalStorage Size runs in your browser for this job. Your storage is not uploaded to FileToolsHub servers for the conversion itself, which matters when you are dealing with private notes, drafts, or local files.
How to use
- 1
Open the page.
- 2
Review key count and size estimate.
- 3
Refresh after clearing site data.
Privacy
Runs entirely in your browser — your storage is not uploaded.
Frequently asked questions
Exact quota?
Browsers vary (~5 MB typical). This tool estimates used bytes, not remaining quota.
Is LocalStorage Size free?
Yes. LocalStorage Size is free for everyday use with no account required, and it runs in your browser.
Does LocalStorage Size upload my data?
No. LocalStorage Size processes your storage locally in this tab.
Can I use LocalStorage Size on mobile?
Yes — use a modern mobile browser. Large files may be slower on limited connections.
Exact quota?
Browsers vary (~5 MB typical). This tool estimates used bytes, not remaining quota.
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