Web browser cookie capacity
Web browser cookie capacity is the minimum amount of data a browser must reliably store for each HTTP cookie, including its name, value and attributes.
Also known as: browser cookie size, HTTP cookie capacity
How big is it?
4.096 kB of data
Minimum per-cookie capacity · standard minimum
A little perspective
About 1.37 times the data of Text page.
Text page: A digital file containing one page of plain text characters without formatting or embedded fonts.
Measurements, assumptions & sources +
Web browser cookie capacity
RFC 6265 says general-purpose user agents should support at least 4,096 bytes per cookie, counting name, value and attributes. This is an interoperability minimum, not a universal hard browser limit.
RFC 6265 — HTTP State Management Mechanism
The marked minimum per-cookie capacity is calibrated. Unmeasured illustration details are representative.
Text page
A defined 3,000-byte UTF-8 text page using single-byte characters; formatting and embedded fonts excluded.
Defined examples — our methodology
The marked data is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 4.096 kB
For comparison, this page uses minimum per-cookie capacity. The record labels the measurement standard minimum; that status is retained wherever the value is compared.
RFC 6265 says general-purpose user agents should support at least 4,096 bytes per cookie, counting name, value and attributes. This is an interoperability minimum, not a universal hard browser limit.
The identifying illustration and the numerical comparison remain separate. How calibrated comparisons work →
Recorded properties
Web browser cookie capacity dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 4.096 kB | Not recorded | standard minimum |
Around this scale
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Sources and method
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The source records and measurement method remain available for inspection.
- RFC 6265 — HTTP State Management MechanismGeneral-purpose user agents should support at least 4,096 bytes per cookie, including name, value and attributes.
There’s always another scale
Follow your curiosity.
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