wrong preposition: sign into (sign in to)

Writers often type "sign into" when they mean "sign in to" for logging into accounts. That spacing matters: "sign in" is the verb (phrasal verb) and "to" is the preposition that points to the destination.

Quick answer

Use "sign in to" (two words) when you mean "log in to" or "access" an account or system. The common exception is the legal idiom "signed into law."

"I need to sign in to my account." - correct for logging in.
"The bill was signed into law." - correct legal exception.
Alternatives: "log in to" or "log on to" work the same way as "sign in to."

Core explanation

"Sign in" is a phrasal verb (verb + particle). When you name the destination, add the preposition "to": sign in to [target]. Don't fuse the particle and the preposition when you mean logging in.

Phrasal verb + preposition: sign in + to → "sign in to my account."
Remember the legal idiom: "signed into law" is about legislation, not logging in.

Real usage and tone

"Sign in to" and "log in to" are standard for websites, apps, and systems. Spoken English often compresses them ("log into"), but in documentation and formal writing keep particle and preposition separate.

"Please sign in to continue." - neutral, customer-facing.
"I'll log in to my account later." - common and acceptable; prefer spacing in formal text.
"Signed into law" - legal phrase; don't treat it as a login.

Work examples (copy-paste fixes)

Ready-to-paste corrections for tickets, SOPs, onboarding messages, and status updates.

Wrong → Right: Wrong: Please sign into the VPN before starting your shift.
Right: Please sign in to the VPN before starting your shift.
Wrong → Right: Wrong: You must sign into the HR portal to submit your timesheet.
Right: You must sign in to the HR portal to submit your timesheet.
Wrong → Right: Wrong: Employees should sign into the secure drive to access project files.
Right: Employees should sign in to the secure drive to access project files.

School examples (LMS, syllabi, student messages)

Use the spaced form in prompts and instructions so students clearly see the action and the destination.

Wrong → Right: Wrong: Sign into Canvas to submit your essay.
Right: Sign in to Canvas to submit your essay.
Wrong → Right: Wrong: Students must sign into the lab computers with their university ID.
Right: Students must sign in to the lab computers with their university ID.
Wrong → Right: Wrong: Make sure you sign into the class forum before posting.
Right: Make sure you sign in to the class forum before posting.

Casual examples (texts, chats, quick replies)

Short messages benefit from the same correction-fixing spacing is usually enough.

Wrong → Right: Wrong: I'll sign into the app in a minute.
Right: I'll sign in to the app in a minute.
Wrong → Right: Wrong: Can you sign into the Wi-Fi for me?
Right: Can you sign in to the Wi-Fi for me?
Wrong → Right: Wrong: I'm already signed into my account.
Right: I'm already signed in to my account.

Try your own sentence

Test the whole sentence instead of the phrase alone: context shows whether the target is a destination (use "to") or an idiom.

Examples: extra wrong/right pairs you can copy

More quick corrections for messages, documentation, and FAQs.

Wrong → Right: Wrong: Please sign into the admin console to check logs.
Right: Please sign in to the admin console to check logs.
Wrong → Right: Wrong: After you sign into the site, update your profile.
Right: After you sign in to the site, update your profile.
Wrong → Right: Wrong: She signed into the NDA without reading it.
Right: She signed the NDA without reading it. (drop "into" when it makes no sense)
Wrong → Right: Wrong: Please log into the portal to download your certificate.
Right: Please log in to the portal to download your certificate.
Wrong → Right: Wrong: We need to sign into multiple legacy systems this week.
Right: We need to sign in to multiple legacy systems this week.
Wrong → Right: Wrong: He was signed into office last year.
Right: He was sworn into office last year. (use the correct verb for the idiom)

Rewrite help: quick patterns to fix sentences

When you spot "sign into," run this tiny checklist and apply one of the patterns below.

Checklist: Is the sentence about logging in? → use "sign in to." Is it about law/government? → "signed into law" may be correct.
If unsure, replace with "log in to"-it's a clear alternative and keeps the parts separate.

Rewrite:
Original: I need to sign into my bank account before the meeting.
Rewrite: I need to sign in to my bank account before the meeting.
Rewrite:
Original: Please sign into your profile to update your info.
Rewrite: Please sign in to your profile to update your info.
Rewrite:
Original: He signed into the agreement without reading it.
Rewrite: He signed the agreement without reading it. (remove "into" if it makes no sense)
Pattern: "[Subject] [sign/log] in to [object]" → "We will sign in to the dashboard at 9 a.m."

Memory trick

Ask: "Sign in where?" If you can answer with a place or thing (account, portal, site), write "sign in to [place]."

"Sign in where? → to the portal" → "sign in to the portal."
If the sense is "become" or "turn into," then "into" stays as one word; otherwise keep the parts separate.

Similar mistakes and related pairs

The same diagnostic (destination vs. idiom) helps with pairs like "turn into" vs "turn in to" and "log into" vs "log in to."

"Turn into" (become) vs "turn in to" (enter/deliver): choose based on meaning.
"Log in to" parallels "sign in to"; prefer spacing in formal writing even if speech often joins them.
Wrong → Right: Wrong: Please log into the system.
Right: Please log in to the system. (formal writing)

Spacing, hyphenation and grammar notes

Don't join, hyphenate, or fuse the verb + particle + preposition for logins. Keep "sign in to."

"sign-in" (hyphen) = noun/adjective: "the sign-in page."
Verb use: "Please sign in to the site." (correct)
Never write "signinto," "sign-in-to," or "sign into" when you mean logging in; those forms confuse readers.

FAQ

Is "sign into" ever correct?

Not for logging in. Use "sign in to" for logins. The common exception is "signed into law," which refers to legislation.

Can I use "log into" instead of "sign in to"?

Spoken English often uses "log into." For formal writing, prefer "log in to," but either phrase conveys the same action.

When should I use "sign-in" with a hyphen?

Use the hyphen when the phrase acts as a noun or adjective (e.g., "the sign-in page"). For the verb phrase, write "sign in to."

How do I quickly fix many instances in a document?

Search for "sign into" and replace with "sign in to" when the context is logging in. Also check for "log into" and change to "log in to" in formal documents. A grammar tool can batch-highlight these instances.

What's a fast mental check to avoid the mistake?

Ask: "Sign in where?" If you can answer with a place or thing, put "to" after "sign in."

Want to catch these mistakes automatically?

If you write help text, emails, or documentation often, use a grammar checker to flag particle/preposition errors like "sign into" so your content stays consistent and clear.

Paste a sentence into a checker to get immediate suggestions and to apply consistent wording across your files.