Passkey localization is security localization, not just button translation. A passkey flow can ask a user to create a credential, confirm an account, unlock a device, use a fingerprint or face check, scan a QR code, choose another device or fall back to another sign-in method. Each phrase sits beside real authentication state. If the target language makes account creation sound like device unlocking, or makes a local biometric check sound like biometric data is being sent to the service, the localization changes what the user believes they are authorizing.
Searches for passkey localization, WebAuthn translation, biometric sign-in localization, passkey UX translation, passwordless authentication localization, security key translation, QR sign-in localization and multilingual authentication UX all point to the same professional requirement: preserve credential identity, authentication ceremony, device role, user-verification meaning and consent while making the interface natural in the target language.
This guide explains how to localize passkeys, WebAuthn-style authentication and biometric sign-in without changing who is authenticating, what credential is being created or used, where biometric verification happens, or what the user is consenting to. It covers registration versus authentication, relying-party identity, account selection, authenticators, device-bound and synced credentials, security keys, QR and cross-device flows, user verification, recovery, fallback, errors, accessibility, support language, audit history and end-to-end localization QA.
This article belongs to eduKateSG’s Master Art of Translation architecture. It extends the specialist authentication layer and should be read beside the existing login, MFA and password-recovery localization guide, while owning the narrower passkey, authenticator and biometric-verification boundary.
Quick answer
Treat the authentication ceremony as structured security state. Translate the instructions, labels and recovery guidance around it; do not reinterpret credential IDs, relying-party identifiers, challenge data, authenticator state, account IDs or protocol values. Be precise about what the user is doing: creating a passkey is different from signing in with one; using a device biometric to unlock a credential is different from sending biometric data to a website; choosing another device is different from changing the account.
- Separate: distinguish registration, sign-in, verification, recovery and fallback.
- Protect: keep protocol values, credential IDs, domains, device identifiers and challenge data unchanged.
- Name: use consistent language for passkey, security key, device, biometric check and account.
- Explain: state what happens on the device and what the service receives without inventing privacy claims.
- Recover: make alternative sign-in paths clear without weakening security meaning.
- Test: verify every translated state against the real authentication outcome.
1. Why passkey localization is unusually sensitive
Authentication copy has a stronger consequence than ordinary navigation copy because users make trust decisions from it. A vague label such as “Continue” may be acceptable inside a low-risk onboarding flow, but in a passkey ceremony the user may need to know whether Continue creates a new credential, approves a sign-in request, links another device or merely advances to account selection. The target language must preserve the action boundary.
Passkeys also distribute the experience across several layers. The application may show one screen, the browser another, and the operating system or authenticator another. Some text is controlled by the product; some comes from the platform. The user still experiences the whole sequence as one sign-in journey. Localization therefore needs to make app-owned copy compatible with platform terminology rather than inventing a private vocabulary that changes meaning between screens.
2. Registration and authentication are different ceremonies
Creating a passkey registers a new credential for an account. Signing in uses an existing credential to prove control. The user may see similar biometric or device prompts in both cases, so language has to carry the distinction. A registration screen that says only “Use Face ID” can sound as though the user is signing in when the product is actually creating a reusable credential.
Use action-specific text such as “Create a passkey” and “Sign in with a passkey”. If a biometric check is a local step required to authorize either action, present it as part of that flow rather than as the identity of the credential itself. The passkey can remain usable even if the user later changes a biometric enrollment on the device, depending on platform behavior. Localization should not collapse these concepts into one noun.
3. Passkey is a credential; biometrics may be the local unlock
One of the most important explanatory boundaries is that a biometric check can be used locally to unlock or authorize use of a credential without the service necessarily receiving the user’s fingerprint or face data. Product wording should reflect the actual architecture. Saying “Send your fingerprint to continue” would be dangerously misleading if the biometric never leaves the device.
At the same time, do not overpromise with absolute privacy claims unless the product has verified them across supported authenticators and platforms. A safer pattern explains the operational role: “Use your device’s screen lock, fingerprint or face verification to continue.” The service-facing authentication remains the passkey ceremony. The platform decides which local user-verification method is available.
4. Terminology needs to match platform expectations
Users may encounter terms such as passkey, security key, authenticator, device, phone, tablet, hardware key, screen lock, fingerprint, face recognition and passwordless sign-in. Translators should not rotate through these terms for variety. Each can refer to a different object or capability.
Build a glossary that records product usage and platform conventions. If the platform has an established localized term for passkey, use it consistently. If “security key” means a physical authenticator, do not use the same target term for any passkey stored on a phone. If “device” refers to the current device in one screen and another device in the next, qualify it. Consistency reduces the cognitive load of a multi-surface security flow.
5. Relying-party identity must remain clear
The user is authenticating to a particular service or domain. Passkey systems bind credentials to a relying-party identity rather than to arbitrary translated brand text. Localization can change how the service name appears, but it must not obscure which site or application is requesting authentication.
Where the interface displays a domain, relying-party identifier or origin, keep the technical value exact. Do not translate domain labels. If a brand has localized marketing names, make sure the security prompt still maps clearly to the underlying service. Users should be able to recognize why a device prompt appeared and whether the request corresponds to the product they intended to use.
6. Account identity and credential identity are separate
A user may have several accounts on one service and several passkeys associated with them. Account names, usernames, email addresses and credential metadata need clear separation. A translated account chooser should not make two accounts look identical by truncating the distinguishing part of an address or substituting a display label for a stable identifier.
Preserve user identifiers as data. Localize surrounding labels such as “Choose an account” or “Passkey created on”. If the product displays a credential nickname, determine whether it is system-generated or user-entered. User-entered names should generally remain untouched. System-generated labels may be localized if they continue to identify the same credential or device accurately.
7. Synced and device-bound credentials need careful explanation
Some passkeys may be synchronized through a platform credential provider; others may be tied more closely to a particular authenticator or security key. Product copy should not promise that a credential is “on this device only” or “available everywhere” unless that statement matches the actual platform and account configuration.
Translate the scope the product genuinely knows. If the system cannot determine whether a passkey will sync, avoid definitive language. If the user is creating a credential through a platform that explicitly indicates sync, explain that within the approved product model. The important localization principle is to avoid converting implementation assumptions into user-facing guarantees.
8. Security keys are not just another passkey label
A physical security key may participate in the same broader authentication standards, but users experience it differently from a phone or built-in platform authenticator. Instructions may ask the user to insert, tap or touch the key, or enter a PIN associated with it. Those physical actions need concrete translation.
Do not use a general word for “key” that users could interpret as a password, encryption key or keyboard key if the context is a hardware security key. Where necessary, pair the established technical term with a concise physical description. If the user must touch a sensor on the key, distinguish that from pressing a button or entering a PIN. Physical-world accuracy is part of security usability.
9. QR and cross-device flows create a role problem
A cross-device sign-in may show a QR code on one device and ask the user to scan it with another. The interface must keep the roles clear: which device displays the code, which device scans, which account is being authenticated, and where the final session will open. Translation that uses vague pronouns can make the user perform the action on the wrong device.
Name the devices by role where possible: “On your phone, scan the QR code shown on this computer.” If the flow changes after scanning, update the language accordingly. Do not translate the QR payload itself. Treat it as machine data. The visual code can be accompanied by localized instructions and accessible alternatives without altering its encoded meaning.
10. Proximity language should match the real requirement
Some cross-device flows depend on nearby-device capabilities, Bluetooth or another proximity signal. The product may ask users to keep devices close together. A translator should not strengthen “nearby” into an exact distance unless the platform defines one. Likewise, do not claim that Bluetooth is transferring credential secrets if its role is only to help verify proximity.
Use operationally truthful language: keep devices nearby, turn on the required capability if necessary, and return to the original device after approval. If a platform permission appears, align product help with the platform’s terminology. The goal is to help the user complete the ceremony without inventing a networking model.
11. User verification is not the same as account verification
Authentication systems use “verification” in several senses. A device may verify the local user through screen lock or biometrics. A service may verify an email address. An administrator may verify a domain. A passkey ceremony may require user verification as a protocol condition. Translating all of these with one broad phrase can obscure what is actually being checked.
Qualify the object where needed: verify your device identity, verify your email, confirm it’s you, or authenticate to the account. The best phrase depends on the product and platform conventions, but the underlying distinction should remain. Users need to know whether the step proves possession of an account, control of a device, or completion of a separate enrollment requirement.
12. Device screen lock can be an authenticator prerequisite
A platform may require a device screen lock before passkeys can be created or used. The product should not describe the screen lock as the passkey itself. Nor should it tell users to create a “password” if the operating system offers PIN, pattern, biometrics or another local method.
Use platform-neutral language when necessary: “Set up a screen lock on this device.” If the product can deep-link to system settings, localize the action according to the destination without promising a particular control name that varies by OS version. Recovery help should explain that changing the local screen lock does not necessarily delete the account or its server-side relationship.
13. Error states must preserve the ceremony stage
“Authentication failed” is often too broad. A passkey action can fail because no credential is available, the user cancelled, the authenticator timed out, the relying-party context is wrong, the device cannot perform user verification, a network request failed after local authentication, or the account no longer accepts the credential.
Localize the actionable boundary. If the user cancelled, say that without implying a security failure. If no passkey exists for the chosen account, offer the right alternative. If the local verification failed, do not tell the user to reset the web account unless that is truly required. Preserve technical error codes in support views while giving end users a concise explanation of what they can do next.
14. Cancellation must not look like compromise
Users cancel security prompts for ordinary reasons: wrong account, unexpected timing, accidental tap or desire to use another method. A cancelled passkey prompt should not automatically produce alarming copy such as “Authentication attack blocked” unless the security system has separate evidence of malicious behavior.
Translate cancellation neutrally and provide a safe next action. “Passkey sign-in cancelled” followed by “Try again” or “Use another sign-in method” is usually clearer. If repeated cancellations trigger a policy, that is a separate system state and should have its own language. Good localization does not turn normal user agency into a security incident.
15. Fallback methods must remain clearly different
A product may offer password, one-time code, recovery key, security key, identity-provider sign-in or support-assisted recovery alongside passkeys. These alternatives should not all become “Other options” with vague descriptions. Users need to understand which method they are choosing and whether it changes the security level or recovery path.
Localize fallback labels consistently with their specialist owners. The passkey article should not redefine password recovery or MFA terminology. Instead, make the handoff clear: “Use password instead”, “Use a security key”, “Send a verification code”, or “Recover your account”. This reduces accidental loops where a user believes they are retrying a passkey but has actually entered a different authentication method.
16. Creating an additional passkey needs explicit account context
Users may register more than one passkey for resilience or convenience. An account security page might offer “Add passkey”. The target text should make clear that the action adds another credential to the same account rather than replacing the existing one, unless replacement is the product’s actual behavior.
After creation, show enough metadata to distinguish credentials: device or provider label where available, creation date, last-used date, or user-provided nickname. These labels help users remove an old credential without deleting the wrong one. Keep dates localized but keep the underlying credential ID and audit evidence stable.
17. Removing a passkey is not the same as signing out
Deleting or revoking a credential changes future authentication capability. Signing out only ends a current session. Removing a device from an account may have yet another meaning. Translation must preserve these boundaries because users can lock themselves out if a destructive credential action sounds like a harmless session action.
Use object-specific verbs: “Remove passkey”, “Sign out”, “Remove trusted device”, “Revoke security key”. Before a destructive passkey removal, the interface can identify the credential and warn if it is the last available strong sign-in method. Do not imply that removing a passkey necessarily deletes the user’s account or erases credentials from every synchronized device unless the product can guarantee that behavior.
18. Biometric terminology varies culturally and technically
Terms for fingerprint, face verification, facial recognition, iris scan and biometrics can carry different expectations. Products should use the platform’s actual capability rather than one broad biometric label when precision matters. If a device exposes “Face ID” or another branded term, follow trademark and platform guidance instead of creating an unofficial localized equivalent.
Avoid anthropomorphic or invasive phrasing such as “the website reads your face” when the device performs local verification. At the same time, do not hide the action behind vague phrases like “confirm” if the user benefits from knowing that a local biometric or screen-lock step is about to appear. Natural language and technical truth can coexist.
19. Privacy copy should describe the actual data boundary
Authentication interfaces often include reassuring statements about biometrics or passkeys. These claims need review because architecture varies across platforms. The product should not say “we never see any authentication data” if it receives public-key credentials, signatures, device metadata or other protocol information. The important distinction is what sensitive secret or biometric material remains local versus what authentication data the service necessarily processes.
Translate approved privacy statements exactly in scope. If the product says biometric templates remain on the device, preserve that claim without broadening it to all authentication data. If the statement is platform-specific, do not universalize it to every device. Security trust is damaged when localization turns a precise technical statement into a sweeping slogan.
20. Account recovery needs to acknowledge passkey loss
A user can lose access to a device, security key or credential provider. Recovery language should explain what alternative proof is available without assuming the passkey can be retrieved from a lost device. If synchronized passkeys may reappear on another signed-in device, say so only when the platform and account state support that path.
The recovery flow should distinguish “I can use another passkey”, “I lost this device”, “I no longer have any passkeys” and “Use another account recovery method”. Translators should preserve the emotional clarity of these options. A user who is already locked out needs direct, low-ambiguity language rather than security jargon.
21. Administrative passkey policies need audience-specific language
Enterprise products may let administrators require passkeys, allow security keys, restrict certain authenticator classes, set recovery policies or view enrollment status. These settings are different from end-user prompts and should use more technical vocabulary where necessary.
Localize policy names while preserving policy IDs and enforcement logic. “Require user verification” should not become “Require biometrics” if screen lock or another method also satisfies the rule. “Allow passkeys” should not become “Disable passwords” unless the configuration actually does that. Administrators make organisational security decisions from these labels, so policy semantics must stay exact.
22. Audit events need credential identity without exposing secrets
Security teams may review events such as passkey created, passkey used, passkey removed, authentication failed, recovery started or security key registered. The event record should keep stable actor, account, credential and timestamp data while the human sentence is localized.
Do not expose private credential material merely to make an event more descriptive. A display label or truncated identifier is usually enough for user-facing history. Support and security tools can show stable non-secret IDs where appropriate. As with other audit localization, the event structure is evidence and the translated sentence is a view of that evidence.
23. Session creation happens after authentication
A successful passkey assertion can lead to a session, but the two events are not identical. A downstream authorization or account-state check can still prevent entry after authentication succeeds. Conversely, a session may already exist and the passkey prompt may be authorizing a sensitive action rather than creating a login session.
Localize the purpose of the ceremony in context. “Confirm with your passkey to change payment details” is better than a generic “Sign in” label if the user is already signed in. The same authenticator can prove presence for several purposes. Product copy should tell the user what operation the proof will authorize.
24. Step-up authentication needs a reason
Some applications ask for a passkey again before a high-risk action. This can feel surprising if the user recently signed in. A brief localized explanation such as “For your security, confirm again before changing recovery settings” helps the user distinguish intentional step-up verification from an unexpected authentication loop.
Do not overstate the threat or claim that suspicious activity occurred unless the risk system says so. The purpose may simply be policy. Preserve the protected action in the target language so users know what will happen after successful verification. Security prompts are easier to trust when they explain context rather than appearing without cause.
25. Accessibility must cover more than the primary button
Authentication can become inaccessible if QR codes lack alternatives, countdowns are not announced, errors rely on color, or platform prompts are described only visually. Localize accessible names, instructions and recovery links with the same semantic precision as visible text.
For cross-device QR flows, provide a nonvisual path when the platform supports one. For security keys, describe physical actions without relying solely on animations. For time-limited challenges, announce meaningful state changes without overwhelming users. A passkey flow should not force a person to switch to a weaker method merely because the primary path was not localized accessibly.
26. Right-to-left layouts can affect code and device instructions
Passkey screens may contain email addresses, domains, short codes, device names and QR-related instructions inside right-to-left interface text. Bidirectional rendering can make punctuation or embedded Latin-script identifiers appear confusing. The machine values must remain exact even as surrounding grammar changes direction.
Use proper bidirectional isolation for domains, identifiers and codes. Test phrases such as “Scan the code on
27. Worked example: first-time passkey creation
A user signs in with an existing method and sees “Create a passkey for faster sign-in next time.” The product explains that the device will ask for its screen lock or biometric verification. The user confirms, the platform creates the credential, and the account page shows a new passkey entry. Each step has a different semantic job.
A strong localization keeps those jobs separate: invitation, local verification, successful registration and later management. It does not say “You are now passwordless” unless the account policy actually removes password use. It does not say “Your fingerprint has been saved to your account” when the biometric is only a local verification mechanism. The user leaves with an accurate mental model of what was created.
28. Worked example: signing in on a new computer with a phone
The user opens the service on a new computer and chooses passkey sign-in. No local passkey is available, so the product offers another-device authentication and displays a QR code. The phone scans the code, verifies the user locally and approves the sign-in on the computer. This is a role-heavy flow with several chances for ambiguous translation.
The localized instructions should consistently refer to “this computer” and “your phone” or equivalent roles. After scanning, the phone can say that it is approving sign-in to the named service on the other device. The computer should say it is waiting for approval rather than asking the user to rescan. Once authentication completes, both devices should show states consistent with the same ceremony.
29. Worked example: removing an old passkey
An account has three passkeys. One is associated with an old device the user no longer owns. The security page lists a recognizable device/provider label and last-used date. The user selects Remove. The confirmation names the credential and explains that it will no longer sign in to this account.
A poor translation says “Remove device”, which could imply remote wiping or unlinking the entire phone. A better translation says “Remove this passkey” and keeps any device-management action separate. After removal, the audit history records the credential event. If the credential is synchronized elsewhere, the product should not claim to erase every local copy unless that is part of the real platform behavior.
30. QA must test real ceremonies, not static screens
Authentication localization cannot be verified from screenshots alone. Testers should create and use credentials on supported platforms, cancel prompts, use another account, trigger no-credential states, remove a credential, try a physical security key, perform a cross-device flow and exercise recovery. Verify both the words and the resulting account state.
- Confirm Create passkey never appears where the product is only signing in.
- Verify Sign in with passkey does not create a new credential unexpectedly.
- Check biometric wording against the real local-verification behavior.
- Preserve domains, account identifiers and credential metadata.
- Test cancellation separately from authentication failure.
- Use a no-passkey account to verify fallback and recovery language.
- Test physical security-key instructions on real hardware where supported.
- Exercise QR and cross-device flows in every supported text direction.
- Remove a passkey and verify the correct credential is revoked.
- Check audit history, timestamps and support diagnostics after each ceremony.
31. Common failure patterns
Common failures include calling every authenticator a biometric, calling every security key a passkey, translating a relying-party domain, saying a credential was created when the user only signed in, saying a biometric was uploaded when it stayed local, treating user cancellation as a security failure, presenting recovery as ordinary retry, and using “remove device” when the product removes only one credential.
Another failure is platform drift. The product team writes one set of authentication terms while the operating system uses another localized vocabulary. Users then move between app copy and system prompts that sound unrelated even though they are part of one ceremony. Aligning terminology with platform conventions reduces this friction without surrendering product clarity.
32. How this owner fits the wider translation architecture
The existing login and MFA owner remains responsible for broad sign-in, second-factor and password-recovery localization. The SSO, SAML and SCIM owner handles enterprise identity federation and provisioning. Permission localization covers device and privacy permissions generally. This passkey owner focuses on credential registration, authenticator selection, local user verification, cross-device ceremonies and passkey lifecycle.
That boundary avoids cannibalization while giving searchers a deep answer to a distinct problem. A team translating a password-reset email does not need this guide. A team translating “Create passkey”, a hardware-key prompt or a cross-device QR sign-in does. Internal links should connect those neighbouring owners rather than folding them into one giant authentication article.
33. A passkey-localization operating checklist
- Document the difference between registration and authentication.
- Use the platform-approved or product-approved term for passkey consistently.
- Keep relying-party domains and protocol identifiers unchanged.
- Separate account identity from credential identity.
- Describe local biometric or screen-lock verification accurately.
- Avoid guarantees about sync or device scope unless the product knows them.
- Use physical-action language for hardware security keys.
- Make cross-device roles explicit in QR flows.
- Treat cancellation as distinct from failure or compromise.
- Name fallback methods rather than hiding them behind generic alternatives.
- Use object-specific language for removing credentials, devices and sessions.
- Test real ceremonies and verify resulting account state.
34. FAQ
Is a passkey the same thing as a fingerprint?
No. A passkey is an authentication credential. A fingerprint may be one local method a device uses to verify the user before allowing the credential to be used. Product copy should not collapse those concepts.
Should a website translate a domain shown in an authentication prompt?
No. Domains and relying-party identifiers are technical identity data. The surrounding explanation can be localized, but the actual domain should remain exact.
Can ‘Sign in with biometrics’ replace ‘Sign in with a passkey’?
Only if the product is truly offering biometric authentication as the account-level method described. In many passkey flows, biometrics are merely the local device-verification step, so the phrase would misrepresent the credential being used.
What should happen when a user has no passkey available?
The interface should explain that no suitable credential is available and offer the supported alternatives: another device, security key, another sign-in method or account recovery. It should not make the user repeatedly retry an impossible ceremony.
Should removing a passkey be described as removing a device?
Not unless the product actually removes the device relationship as well. A passkey is a credential. Device management, session management and credential management should remain distinct in the target language.
Conclusion
Professional passkey localization preserves the user’s understanding of authentication. The target language should tell the user whether they are creating a credential or using one, whether local device verification is occurring, which service and account are involved, what another device is being asked to do, and what happens if they cancel, recover or remove a credential.
The durable rule is to translate the human ceremony while protecting the security ceremony underneath. Protocol identifiers, credential relationships and authentication outcomes remain structured system facts. Clear target-language instructions make those facts understandable without rewriting them. When that boundary holds, passkeys can feel simpler across languages without becoming less precise.