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Format / pretty-print — JSON Formatter, SQL Formatter, XML Formatter, CSS Minifier (and its inverse). Use when an API response or DB dump arrives as a single 14,000-character line and you need to read it. JSON Formatter also validates — if it refuses to format, your input is broken JSON, and the error message tells you the byte offset.

Encode / decode — Base64, URL Encoder, HTML Encoder, Hash Generator (MD5/SHA-1/SHA-256/SHA-512), JWT Decoder. Base64 for data URIs and Basic Auth headers; URL Encoder for query-param-safe strings; JWT Decoder to peek at the claims of a token without firing up jwt.io (this one is fully local, where jwt.io's input box uploads to their server).

Convert between formats — YAML to JSON, CSV to JSON, JSON to CSV, Number Base. The YAML/JSON pair handles config-file conversions cleanly; CSV/JSON handles spreadsheet ↔ API-payload moves. Number Base converts integers between binary, octal, decimal, and hex (all four directions, not just one).

Test / inspect — Regex Tester (live match preview as you type), HTTP Status (lookup any 1xx-5xx code with the spec text), API Tester (lightweight client for one-off requests, no Postman install). Cron Expression Builder for when you've forgotten which field is day-of-week and which is month.

Design + utility — Color Converter (HEX ↔ RGB ↔ HSL), Color Palette generator, Timestamp converter (Unix epoch ↔ readable in any timezone), Screen Info, Chmod Calculator (drag the rwx checkboxes, get the octal — faster than the calculator-app trick).

Generate — UUID Generator, Hash Generator, JWT Decoder, Docker Compose Generator, Commit Message Generator (helps draft Conventional Commits), SSL Checker (validates a domain's cert chain, expiry, ciphers — for ops moments).

Every tool in this category executes in your browser tab. There is no upload, no server-side decode, no analytics on tool input. This rules out three classes of leak that competitor sites routinely commit: (1) API tokens pasted into a JWT decoder ending up in someone's request log, (2) database column dumps formatted via JSON-formatter SaaS that retains them, (3) regex patterns containing internal hostnames or trade secrets cached by a third-party service.

The flip side: you give up cross-device sync (no "open this on my phone" — the data lives in this tab only) and bulk-batch processing (no "format these 800 JSON files in one upload"). For both of those, you'd want a dedicated workstation tool. For one-off, secret-aware utility work — which is most dev usage — client-side wins on every axis that matters.

There's a recurring pattern: "why not install `jq` / `xmlstarlet` / `openssl` for this?" Answer: you should, for repeated work in scripts. But CLI tools have setup tax (install, learn flags, remember name) and don't help when you're (a) on someone else's machine, (b) on a phone investigating an alert, (c) sharing the result with a colleague who doesn't have the CLI, or (d) doing a one-shot inspection where opening a tab beats writing a one-liner.

Web tools win on portability and shareability; CLI wins on automation and composability. Most working developers use both — bookmark Toolpile for the one-shot, keep `jq` in your path for the pipeline.

The category also includes a few tools that are genuinely better in a browser: Color Picker (clicking a color swatch beats `chroma-js` syntax), Regex Tester (live highlighted matches beat re-running grep until your pattern works), HTTP Status (looking up `418` is faster than `man curl`).

No code execution. No JavaScript playground, no Python REPL, no Rust playground. Those exist (and are excellent — CodeSandbox, Replit, play.rust-lang.org) but require backend execution which conflicts with the privacy promise.

No AI-assisted features. No "ask the AI to explain this regex" or "AI-generate a SQL query". The category is mechanical utilities only; AI integration is intentionally absent because once you accept the dependency, the tool stops being client-side. The Prompt Engineering tools live in the AI category and are clearly scoped.

No persistent storage / accounts. Toolpile auth (Pro tier) only enables limit-raises, not data persistence. Each tool tab is stateless — close it and your input is gone. For a JSON formatter that remembers your last 10 inputs, you want a desktop tool.