Prose and code modes
Apply human title/sentence rules or deterministic identifier separators as different operations.
Writing and developer case converter
Convert text case without losing control.
Transform prose, identifiers, filenames, and lists with visible rules and a one-click copy or download.
Use the free toolRuns in this browser
case converter
The converter separates prose rules from identifier rules, preserves line structure when requested, and lets you provide acronyms that must remain uppercase.
Result
The jobs this tool completes
Built around the failure points.
Batch-friendly line handling
Transform lists and filenames one item per line without joining everything together.
Acronym control
Keep known abbreviations readable instead of turning API into Api.
Workflow
From input to an auditable output.
- Paste one passage or a line-separated batch.
- Choose a prose or identifier case and list any acronyms to preserve.
- Review the converted output, copy it, or download a UTF-8 text file.
Learn the details
Use the result with fewer surprises.
Guide
Title case vs sentence case
Choose a capitalization style for headings and interfaces and understand where automated rules need editorial review.
Read guide →GuidecamelCase, snake_case, and kebab-case
Understand common identifier case styles, word boundaries, acronyms, filenames, URLs, and language conventions.
Read guide →Common questions
What this tool does—and does not do.
Prose and code modes
Apply human title/sentence rules or deterministic identifier separators as different operations.
Batch-friendly line handling
Transform lists and filenames one item per line without joining everything together.
Acronym control
Keep known abbreviations readable instead of turning API into Api.
Does this guarantee the result will be accepted elsewhere?
No. The tool completes and explains its calculation or transformation, but another platform can apply different limits, rules, encoders, or policies. Verify consequential output in the destination.
Ready
Convert case
Return to the tool with your inputs still in this tab.