How it works
Complete the job in three clear steps
- Choose English text.
- Set the available options and create a list of writing suggestions.
- Review and download or copy the result before leaving the page.
Private Lucaden text & writing tool
Grammar Checker
Check English grammar, spelling, punctuation, and style locally with Harper and apply individual suggestions.
Free to use Your source content is processed in this browser and is not uploaded to Lucaden.
Loading tool workspace…
Important
Check the result before relying on it
Scan-test generated codes before printing or distribution. A generated barcode does not register identifier ownership, and decoded external links should be checked before opening.
Practical details
What this Lucaden tool does
Harper runs its grammar engine on-device through WebAssembly. Suggestions are aids rather than authoritative edits, so review intended meaning, names, and specialist terminology.
The original stays unchanged; Lucaden creates a separate result in browser memory.
Included capabilities
- Grammar and spelling checks
- Punctuation and style hints
- Per-suggestion fixes
- On-device WebAssembly
Useful for
- Review an email
- Polish a report
- Catch common typos
- Improve a draft
Questions
About this tool
Which languages are supported?
This workspace is for English. Harper includes selectable English dialects but is not a general multilingual grammar service.
Is my writing uploaded?
No. The Harper engine and dictionary run locally in your browser.
Open-source foundations
Built transparently
Lucaden documents its standards sources, architectural references, and permissive runtime dependencies while keeping this workspace consistent with the Lucaden interface.