Last updated — factual comparison, no affiliate links.
The short verdict: Code Beautify wins on sheer breadth — hundreds of tools covering formats LocalFirstTools does not touch. LocalFirstTools wins on uniformity: 23 tools that all follow one verifiable rule, your data never leaves the browser tab. If the format you need is exotic, go there; if the job is JSON, tokens, encodings, hashes or text — the everyday set — the local toolkit covers it with stronger guarantees.
| LocalFirstTools | Code Beautify | |
|---|---|---|
| Number of tools | 23, focused on data/dev text | Hundreds, across many formats |
| Local-only guarantee | Yes, site-wide and verifiable | Unverified and likely varies per tool — check their privacy policy |
| Ads | None | Historically ad-supported — check their site |
| Account | No | No for core tools |
| Price | Free | Free |
| Consistency | One design, one privacy model | Varies across the catalog |
These are genuinely different products wearing similar clothes. Code Beautify is a directory: whatever obscure conversion you need — XML to something, an image tweak, a language beautifier — it probably has a page for it. LocalFirstTools is a toolkit: a small set of tools engineered to one standard, where “nothing is uploaded” is not a per-page claim but the architecture of the whole site, published in how it works and llms.txt, and checkable in your own network tab in ten seconds.
Reach for Code Beautify for long-tail formats and non-sensitive data. Reach for LocalFirstTools when the data is sensitive or the job is one of the everyday ones: format JSON, Base64, case conversion, hashes, timestamps. Many developers sensibly use both.
Try the local-only way
Pretty-print, minify and validate JSON in your browser. Nothing is uploaded — verify it in your network tab.
It varies by tool — some of its converters run in the browser, while features like fetching from a URL or saving/sharing necessarily involve servers. There is no blanket answer across hundreds of tools; check their privacy policy and watch the network tab for the specific tool you use.
Code Beautify, by far — its catalog spans hundreds of converters, beautifiers and generators across many formats (its site blocks automated verification, so browse codebeautify.org for the current count). LocalFirstTools deliberately ships 23.
Uniform guarantees. With 23 tools built on one rule — nothing leaves the tab — the privacy property holds everywhere, the design is consistent, and each tool gets real attention (exact error positions, RFC-accurate behavior). A catalog that big cannot promise uniformity.