Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
guaranteed by
Grammar usage guide and real-world examplesUSAGE SUMMARY
"guarantee by" is correct and usable in written English.
You can use it when you want to talk about something that is promised or ensured by a specific person/entity. Example: The product comes with a 30-day money-back guarantee by the manufacturer.
✓ Grammatically correct
News & Media
Science
Encyclopedias
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
59 human-written examples
It isn't guaranteed by anything".
News & Media
It is guaranteed by MetLife".
News & Media
Police station advice was guaranteed by law.
News & Media
The freedom guaranteed by tenure is precious.
News & Media
Its borrowings are guaranteed by the government.
News & Media
Guaranteed by Paul Revere's ride.
News & Media
The loans are guaranteed by the government.
News & Media
The issue is guaranteed by MBIA.
News & Media
A hard-rockin' time guaranteed by this management.
News & Media
The independence of the judiciary is guaranteed by the constitution.
Encyclopedias
Freedom of religion is guaranteed by the 1995 constitution.
Encyclopedias
Expert writing Tips
Best practice
When using "guaranteed by", clearly state the entity providing the guarantee to avoid ambiguity. For example, "The loan is guaranteed by the government" is more precise than "The loan is guaranteed."
Common error
Avoid using "guaranteed by" when the entity offering the guarantee is unclear or lacks the authority to do so. Claims like "This diet is guaranteed by experts" are misleading without specifying which experts and their credentials.
Source & Trust
84%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "guaranteed by" functions as a prepositional phrase that modifies a noun or noun phrase. It indicates that the subject is assured or secured by a specific entity or condition. As Ludwig AI confirms, this is a correct and usable phrase in English.
Frequent in
News & Media
42%
Science
32%
Encyclopedias
8%
Less common in
Formal & Business
5%
Wiki
3%
Reference
0%
Ludwig's WRAP-UP
The phrase "guaranteed by" is a common and grammatically correct prepositional phrase used to indicate assurance or security provided by a specific entity. Ludwig AI confirms its validity and usability in English writing. It appears most frequently in news and media, science, and encyclopedic contexts, suggesting a neutral to professional register. When using this phrase, ensure clarity by specifying the guarantor. Alternatives like "assured by", "backed by", and "secured by" can be used depending on the specific nuance you wish to convey. With a high expert rating and numerous examples in Ludwig, "guaranteed by" stands as a reliable choice for expressing assurance in various forms of communication.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
warranted by
Similar to guaranteed, but can imply a more formal, legal promise.
ensured by
Highlights the act of making something certain.
backed by
Suggests support or endorsement, often financial.
assured by
Focuses more on the act of assuring rather than a formal guarantee.
secured by
Indicates that something is protected, often through collateral.
protected by
Focuses on shielding from harm or loss.
underwritten by
Implies financial backing or insurance coverage.
endorsed by
Implies official approval or support.
certified by
Implies official certification or accreditation.
validated by
Focuses on confirmation of correctness or truth.
FAQs
How can I use "guaranteed by" in a sentence?
Use "guaranteed by" to indicate assurance or security provided by a specific entity. For example, "The quality is guaranteed by our rigorous testing process".
What are some alternatives to "guaranteed by"?
You can use alternatives such as "assured by", "backed by", or "secured by" depending on the context.
Is it correct to say "guaranteed from" instead of "guaranteed by"?
No, "guaranteed from" is not grammatically correct. The correct preposition to use is "by", as in "guaranteed by".
What's the difference between "warranted by" and "guaranteed by"?
"Warranted by" often implies a more formal or legal promise, while "guaranteed by" is a more general assurance.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
4.6/5
Expert rating
Real-world application tested