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
when checking in
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "when checking in" is correct and usable in written English. You can use it in contexts related to arriving at a location, such as hotels, airports, or events. Example: "When checking in at the hotel, please have your ID ready." Alternative expressions include "upon arrival" and "during check-in."
✓ Grammatically correct
News & Media
Travel
Wiki
Alternative expressions(20)
at check-in
upon registration
during check-in
upon check-in
at the time of check-in
at registration
during the registration process
at the front desk
after checking in
on arrival
upon arrival
when you check in
during the check-in process
during registration
when registering
upon presentation
register
arrive
sign in
upon your arrival
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
32 human-written examples
The card must be presented when checking in.
News & Media
But it's hard to remember that when checking in on Warhol's grave.
News & Media
"So, are there snakes?" I asked when checking in at one residence.
News & Media
But they've been managing to crack jokes when checking in with mission control and their families.
News & Media
Delta Air Lines UPGRADES First-class upgrades can be bought at Delta.com when booking online or when checking in, if seats are available.
News & Media
The person who rented the room, under the name Dan Cohen, had vanished, and the details he gave when checking in turned out to be false.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
28 human-written examples
The guest book, when checked in May, was being filled by empowered teenagers making their mark at the Museum of Modern Art.
News & Media
Cell proliferation in composite scaffolds was twice than in pure chitosan when checked in vitro using MG-63 cell line.
Science
Of course his shots were awesome, but there was a problem when checked in with him a few weeks later.
News & Media
In Turkey, only 40.7% of the HBP monitors used by patients were accurate, when checked in a campaign run at a University Hospital [ 22].
Science
However, overall only 101 of 199 omissions detected at chart round were subsequently corrected (51% of all omissions), when checked in September 2009.
Science
Expert writing Tips
Best practice
When writing instructions or guidelines, use "when checking in" to clearly indicate the specific point in time when an action should be taken. For example, "When checking in, ensure you have your identification ready."
Common error
Avoid using "while checking in" when you intend to specify a single action that occurs precisely at check-in. "When checking in" is more appropriate for actions directly associated with the check-in process, whereas "while checking in" suggests actions happening simultaneously but not necessarily related.
Source & Trust
89%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "when checking in" functions as an adverbial clause of time, modifying the main clause by specifying when the action in the main clause occurs. As evidenced by Ludwig, it introduces the temporal context for the action described in the rest of the sentence.
Frequent in
News & Media
45%
Travel
20%
Wiki
10%
Less common in
Formal & Business
5%
Science
10%
Arts
5%
Ludwig's WRAP-UP
In summary, "when checking in" serves as a temporal marker, indicating the timing of an action within the check-in process. Ludwig AI shows the phrase is grammatically correct and frequently used across various contexts, particularly in travel, news, and general instructions. While "during check-in" and "upon check-in" are viable alternatives, "when checking in" offers a versatile and clear way to specify the timing of an action related to check-in. Remember to use "when checking in" for actions directly tied to the check-in process, and avoid using "while checking in" if a precise timing is required. In sum, understanding the function, purpose, and register of "when checking in" will help with the correct usage of this phrase.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
upon check-in
Replaces "when" with "upon", indicating immediacy upon the action of checking in.
during check-in
Substitutes "when" with "during", focusing on the check-in process itself.
at the time of check-in
More formal and specific, emphasizing the exact moment check-in occurs.
while checking in
Similar to "when", but implies a continuous action occurring simultaneously with checking in.
as you check in
Shifts the focus to the person checking in, using a more direct address.
on arrival for check-in
Emphasizes the arrival aspect, framing check-in as the purpose.
at registration
A more general term, suitable for events or locations where "check-in" might not be the standard term.
upon registering
Formal alternative emphasizing the act of registering.
during the registration process
Focuses on the broader registration process.
at the front desk
Specifies the location where check-in typically occurs.
FAQs
How can I rephrase the sentence "When checking in, please provide your passport?"
You could say "Upon check-in, please provide your passport" or "Please provide your passport "at check-in"".
Is it correct to use "while checking in" instead of "when checking in"?
While both can be grammatically correct, "when checking in" typically refers to an action that coincides with the check-in process, while "while checking in" implies an action occurring during the process but not necessarily directly related to it.
What's a more formal way to say "when checking in"?
A more formal alternative is "upon registration" or "at the time of registration".
Can I use "during check-in" interchangeably with "when checking in"?
Yes, "during check-in" can often be used interchangeably with "when checking in", especially when referring to actions that occur as part of the check-in process.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
89%
Authority and reliability
4.6/5
Expert rating
Real-world application tested