Free Online Tools for
Developers & Everyone

About Tools Searcher

Tools Searcher is a curated catalogue of single-purpose web utilities built around one rule: every tool runs entirely in your browser. Nothing you paste, type, or upload ever leaves your device — open the network tab if you want to confirm it. The site exists because the “online tools” landscape is saturated with ad-heavy, slow, tracking-laden pages, and we believe a developer-grade utility should not require an account, a queue, or a paywall to format a JSON string or decode a JWT.

Tools are grouped by intent — Dev Tools, Text Tools, AI & LLM, Finance, Health, Geography and Maths — and each page is built to do exactly one job well, with the underlying method documented openly.

How tools are selected and built

• One job per tool. A converter converts; a validator validates. If a tool starts asking for sign-ups, upsells, or premium tiers, it is removed from the catalogue.
• Client-side only, no telemetry on user data. Every tool is implemented in plain HTML, CSS and JavaScript with zero backend. We do not log, store, or transmit the content you process. Analytics measure page views, never inputs.
• Methods cited. For finance and health calculators (BMI, mortgage, IBAN validation, compound interest…), the underlying formulas reference the original specifications — ISO standards, central bank rates, peer-reviewed equations — rather than approximating from memory.
• Iterative, not auto-generated. Each tool is tested manually against edge cases (empty inputs, invalid encodings, Unicode boundaries, leap years) before publication, and revised when readers report issues by email.
• No framework, no build step. The whole site is vanilla HTML/CSS/JS. That is both a technical choice (pages load fast on slow connections) and an editorial one (the code is readable by anyone who wants to audit it).