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 · minimum per-cookie capacity
Minimum per-cookie capacity · standard minimum
A little perspective
Web browser cookie capacity vs Text page: data size comparison
The capacity of a web browser cookie is about 1.37 times the data size of a text page.
BYTES OF DATA
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.
A digital file containing one page of plain text characters without formatting or embedded fonts.
Measurements, assumptions & sources +
Web browser cookie capacity
Minimum per-cookie capacity: 4.096 kB; standard minimum.
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
Data: 3 kB; example.
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.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 4.096 kB
We compare the capacity of a web browser cookie. This value follows a stated standard.
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 picture identifies the subject; the diagram compares the recorded values. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 4.096 kB | Not recorded | standard minimum |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valueDigital informationText page3 kBDataA digital file containing one page of plain text characters without formatting or embedded fonts.
Nearest higher valueDigital informationNovel as plain text1 MBDataThe plain digital text of a book stored as an unformatted file, without images or layout.Sources and method
Want to check the number?
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.
DigitalMaximum standard Ethernet frame1.518 kBThe maximum standard Ethernet frame is the largest unit of data that can be transmitted in a single, untagged Ethernet packet, excluding certain protocol overheads.DigitalText page3 kBA digital file containing one page of plain text characters without formatting or embedded fonts.DigitalNovel as plain text1 MBThe plain digital text of a book stored as an unformatted file, without images or layout.DigitalBitcoin block header80 BA Bitcoin block header is a fixed-format data structure containing summary information about a block in the Bitcoin blockchain.DigitalEd25519 digital signature64 BAn Ed25519 digital signature is a cryptographic value used to verify the authenticity and integrity of digital messages or documents.DigitalSHA-256 digest32 BA SHA-256 digest is a unique digital fingerprint generated from input data using the SHA-256 cryptographic hash algorithm.DigitalGPS navigation message subframe37.5 BA GPS navigation message subframe is a segment of digital data transmitted by GPS satellites to provide positioning and timing information to receivers.
DigitalCompressed photo3 MBA compressed photo is a digital image file that has been processed to reduce the amount of data needed to store or transmit it.