Are these developer tools really free?

Yes. All 60 tools are free to use with no account, no usage limit and no paywalled features. There is nothing to sign up for and nothing to install.

Does my data get uploaded anywhere?

No. Every tool runs entirely in your browser using standard web APIs. The JSON you paste into the formatter, the token you paste into the JWT decoder and the file you hash never leave your machine — there is no server to send them to.

Do I need to install anything?

No. These are online tools: open the page and paste. No installation, no browser extension, no command-line setup. They work in any modern browser on desktop or mobile.

Which developer tools are available right now?

AI (11): Prompt Cleaner, Prompt Token Counter, LLM Cost Calculator, Context Window Calculator, Prompt Diff Viewer, Prompt Optimizer, JSON to Prompt Generator, Function Calling Generator, OpenAI Structured Output Schema Builder, AI Output Formatter, AI Temperature & Top-p Simulator. JSON (8): JSON Formatter & Validator, JSON Minifier, JSON to TypeScript, JSON Diff & Compare, JSON Schema Validator, JSON to CSV & CSV to JSON Converter, JSONPath Tester, JSON to Zod Schema. SQL (4): SQL Formatter, SQL Minifier, SQL Query Builder, SQL Query Explainer. API (7): cURL to JavaScript Fetch Converter, cURL to Python Requests Converter, cURL to Axios Converter, cURL to Node.js Converter, GraphQL Formatter, HAR File Analyzer, HTTP Header Analyzer. OpenAPI (5): OpenAPI Validator, Swagger & OpenAPI Formatter, OpenAPI Diff Checker, OpenAPI TypeScript Client Generator, OpenAPI Mock Server Generator. Regex (4): Regex Tester, Glob Pattern Tester, Regex Generator, Regex Cheat Sheet. Security (6): JWT Decoder, Base64 Encoder & Decoder, Hash Generator, Password Generator, JWT Generator, SSL Certificate Decoder. DevOps (5): ENV Parser, YAML to JSON Converter, Cron Expression Parser, Docker Compose Validator, Kubernetes YAML Validator. Database (5): UUID Generator, Prisma Schema Formatter, Mock Data Generator, ULID Generator, Mongo Query Builder. Utilities (5): URL Encoder & Decoder, Unix Timestamp Converter, Text Diff Checker, Markdown to HTML Converter & Preview, QR Code Generator. Every one of them is free, needs no account, and runs entirely in your browser.

Are there ads or trackers?

No advertising, no analytics scripts and no third-party requests of any kind. That is also why there is no cookie banner — there are no cookies to consent to.

Can I use these tools on my phone?

Yes. Every tool is responsive and works in mobile browsers. Light and dark themes are both supported and the choice is remembered on your device.

60 tools live · nothing leaves your browser

Free online developer tools that run in your browser

Paste your data and go — no sign-up, no upload, nothing stored.

Open the JSON formatter Browse all 60 tools

100% client-side

Every tool runs in your browser. Your input is never uploaded, logged or stored.

No sign-up

No account, no email, no paywall on any of the 60 tools.

Instant results

No server round-trip and no waiting. Output updates as you type.

No ads, no trackers

No advertising, no analytics scripts, no third-party requests, no cookie banner.

One site, every format

Ten categories of browser-only tools — pick one to see what's inside.

AIToken counts, model cost and prompt cleanup.

JSONFormat, validate, diff and convert JSON.

SQLFormat, minify and explain SQL queries.

APITurn a cURL command into real code.

OpenAPIValidate, diff and mock OpenAPI specs.

RegexBuild and test regex with live matches.

SecurityDecode JWTs, hash and generate credentials.

DevOpsValidate Compose, Kubernetes, YAML and env files.

DatabaseGenerate IDs and build queries.

UtilitiesTimestamps, URLs, QR codes and more.

tools live

100%

free, no signup

250K+

tool runs to date

9K+

monthly developers

Pricing

One plan, and it's free. A second is on the way.

Free

Current plan

$0 forever

All 60 tools, unlimited use
No account or email required
Runs entirely in your browser
No ads, no trackers, no cookie banner

Start using the tools

Pro

Coming soon

TBA

We're working on a paid tier for teams that want more than the free tools offer. No pricing or feature list yet — there's nothing to show you honestly until it exists.

Frequently asked questions

Pick a tool and paste something in

No sign-up, no upload, no waiting — just the tab you already have open.