How In-Browser Canonical & Hreflang Tag Generation Works
Canonical & Hreflang Tag Builder runs entirely in your browser with JavaScript. There is no sign-up, and whatever you type or open here is processed on your device instead of being sent to a server.
Build Accurate Canonical and Hreflang Tags in Your Browser
Prevent duplicate content issues and configure international SEO targeting with accurate canonical and hreflang link tags. All tag creation happens directly inside your browser memory, so unreleased international URLs and private URL structures are never sent to a server.
Self-Referencing Canonical and ISO Code Verification
Every generated tag set includes a self-referencing link for this page, checks that the language is a 2- or 3-letter code and the region a 2-letter code, and turns the common mistake en-UK into en-GB; it checks the format only, not whether a code exists. The tool builds the tags for one page and cannot check your other language versions, so add the same set of hreflang tags to every version yourself.
Support for x-default Fallback Tagging
Tick the x-default option to add rel='alternate' hreflang='x-default', which this tool points at your canonical URL, as the fallback for visitors whose language or region is not listed.
Why processing in your browser matters
Many online tools upload your files or text to a server to process them. This one does the work on your computer or phone, so your data is not sent to us or stored anywhere else. That lowers the risk when you work with confidential material, although you should still follow your organisation's own rules. Read how this works in our Privacy Policy.
- No uploads: files are opened and saved on your device, so there is no upload or download wait.
- No account: nothing to sign up for or install.
- Free to use: no subscriptions or paywalls.