Online Case Converter — UPPERCASE, lowercase, Title Case, camelCase, snake_case
Change text case
Convert text instantly between 10 cases: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, aLtErNaTiNg, and InVeRsE — all from a single panel with a live preview that updates as you click. A smart case-detection button identifies the current format of any pasted text, while swap and download let you flip inputs and export the result as a .txt file. The converter correctly handles non-ASCII scripts including Cyrillic and accented Latin characters, so it works for Russian, Spanish, French, German, and Portuguese text without mangling letters. Use it to keep brand names consistent across ad creatives and product pages, normalize code identifiers between camelCase and snake_case, or deduplicate entries in a CSV before import. Everything happens 100% locally in your browser — no text is uploaded, no API key required, and the conversion runs instantly even on large documents.
Ten casing modes for code, content, and brand assets
Switch between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, aLtErNaTiNg, and InVeRsE with a single click — every variant a developer, marketer, or editor could need. Smart case detection recommends the right mode for the input, the live preview shows the result before you commit, and one-click download or swap-back lets you move between formats without losing the source text. It is the same workflow for renaming a batch of CSS classes, fixing all-caps product titles in a CSV, or alternating case for a social media meme.
Local conversion that respects Cyrillic and accented alphabets
The converter handles non-ASCII characters correctly — Cyrillic, French accents, German umlauts, and Spanish ñ all preserve their case rules instead of being mangled by naive toUpperCase calls. Everything happens in your browser with no upload, no logging, and no API calls, which matters when you are processing internal product names, source code, or unpublished marketing copy. Drop in text of any size and the result is instant.