We check every product on this page once a day and record whether it still answers.
A free set of 17+ client-side developer utilities (JSON/XML/YAML/SQL formatters, regex tester, JWT decoder, hash generator) that run entirely in the browser with nothing sent to a server.
FreeNo sign-upNothing to install
What to know▼
How it works
Provides 17+ browser-based developer tools, JSON/XML/YAML/SQL formatters, a regex tester, a JWT decoder, a hash generator and more, all running client-side so nothing pasted is uploaded or logged.
Pricing
No signup, no rate limits on the core tools.
Best for
Developers who want quick formatting/decoding tools without an account or sending data to a server.
We check every product on this page once a day and record whether it still answers.
Free, no-signup toolkit of 169 diagnostics for DNS, email authentication, TLS certificates, IP blacklists and security headers, built for self-hosters debugging mail and web infrastructure.
FreeNo sign-upData stays with you
What to know▼
How it works
runs DNS/SPF/DKIM/DMARC/TLS/blacklist/header checks plus in-browser dev utilities (JWT, cron, regex, hashing)
What's different
replaces juggling six separate diagnostic sites; some checks keep data local to your machine
Pricing
free to run checks; watchlists, alerts, embeddable badges and API available on top
Best for
self-hosters and sysadmins debugging DNS/email/TLS issues
We check every product on this page once a day and record whether it still answers.
15 free browser-based developer tools, JSON formatter, regex tester, encoders, generators, styled with a nostalgic Windows 95 look. Runs in the browser, not installed, nothing uploaded to a server.
FreeNo sign-upNothing to install
What to know▼
How it works
15 free developer and productivity tools — JSON formatter, regex tester, base64/URL encoders, UUID and password generators, unit and color converters — running entirely in the browser with a Windows 95-styled interface.
What's different
Nothing is uploaded to a server; everything runs client-side with no signup, ads or tracking.
Pricing
Free.
Best for
Developers who want quick browser-based utility tools without installing anything.
We check every product on this page once a day and record whether it still answers.
A privacy-first IP lookup and network diagnostics toolkit (DNS, WHOIS, WebRTC leak checks) with no account and no tracking, aimed at technical users rather than general consumers.
No sign-upData stays with you
What to know▼
How it works
Shows your public IPv4/IPv6 address, approximate location, ISP and ASN, and runs DNS, WHOIS/RDAP, reverse DNS and WebRTC leak checks.
What's different
No account, no marketing trackers, and no persistent raw IP storage in app-controlled systems.
Best for
Technical users who want network diagnostics without creating an account or being tracked.
We check every product on this page once a day and record whether it still answers.
A free hub of 100+ browser-based tools spanning PDFs, images, SEO and developer utilities, no sign-up or downloads required. A general toolkit with a dedicated developer section, not built for one profession.
FreeNo sign-upNothing to install
What to know▼
How it works
A browser-based hub of 100+ tools for PDFs, images, text, developer utilities, SEO, calculators and generators, with no downloads or sign-up.
What's different
Runs entirely in the browser with no account or install, covering many task categories in one place.
Pricing
Free.
Best for
Students, developers, creators and professionals who want quick access to varied everyday tools without setting up accounts.
We check every product on this page once a day and record whether it still answers.
A free collection of 85+ browser-based utility tools (word counter, calculators, JSON formatter, hash and password generators, converters) that run entirely client-side with no file uploads, instead of scattered single-purpose tool sites.
Watch out · PDF tools, image compression, and AI-powered utilities are listed as coming soon, not yet live.
FreeNo sign-upData stays with you
What to know▼
How it works
Everything runs in the browser with no signup and no tracking; files are never stored because there is no upload.
Watch out
PDF tools, image compression, and AI-powered utilities are listed as coming soon, not yet live.
We check every product on this page once a day and record whether it still answers.
A free collection of 50 client-side web utilities (code formatter, regex tester, image compressor, timestamp converter and more) that run entirely in your browser with no login required.
No sign-upData stays with you
What to know▼
How it works
A collection of 50 client-side web utilities — code formatter, regex tester, image compressor, Unix timestamp converter and more — that run entirely in the browser.
What's different
Runs 100% locally with no login required, so tools work instantly without uploading data.
Best for
Developers who want quick one-off utilities without creating an account or uploading files.
We check every product on this page once a day and record whether it still answers.
110+ browser-based dev utilities — JSON, JWT, regex and SQL formatting and more — that run entirely client-side with no signup, uploads or server calls.
FreeNo sign-upData stays with you
What to know▼
How it works
A collection of 110+ developer utilities — JSON formatter, JWT decoder, regex tester, base64, diff checker, SQL formatter and more — that run entirely in the browser.
What's different
No uploads, no server calls, and no signup, unlike tools that process input server-side.
Pricing
Free.
Best for
Developers who want quick one-off formatting or decoding tools without sending data to a server.
We check every product on this page once a day and record whether it still answers.
A Chrome extension that scans pages you visit and flags matching Homebrew packages you can install. Aimed at developers who use Homebrew on macOS, positioned as privacy-first.
Data stays with you
What to know▼
How it works
A Chrome extension that scans the pages you browse and detects matching Homebrew formulae and casks as you go.
What's different
Positioned as privacy-first, with the description noting it avoids uploading data.
Best for
Developers on macOS who use Homebrew and want relevant packages surfaced while browsing.
We check every product on this page once a day and record whether it still answers.
17 client-side developer utilities, JSON formatter, JWT decoder, regex tester, hash and UUID generators and more, in one page, each also exposed as a REST API endpoint. No sign-up, nothing leaves your browser.
No sign-upData stays with you
What to know▼
How it works
A single page bundling 17 client-side developer utilities — JSON formatter, Base64 encoder/decoder, JWT decoder, regex tester, hash generator, UUID generator, URL encoder, timestamp converter, password generator, SQL formatter, cron parser, Markdown preview, color converter, diff tool, QR code generator, Lorem Ipsum generator, and an AI content detector — each also available as a REST API endpoint.
What's different
All processing happens client-side, so data never leaves the browser, and no sign-up is required.
Pricing
No sign-up required.
Best for
Developers who want quick access to common utilities without installing separate tools, including via API in scripts.
We check every product on this page once a day and record whether it still answers.
A free collection of browser-only utilities — JSON formatter, regex tester, password generator, QR generator and more — for developers and quick technical tasks, with nothing ever uploaded to a server.
FreeData stays with you
What to know▼
How it works
A collection of browser-only tools - JSON formatter, password generator, regex tester, unit converter, QR generator and more - that run entirely client-side.
What's different
Nothing ever leaves the browser to a server.
Pricing
Free.
Best for
Developers needing quick technical utilities without uploading data.
We check every product on this page once a day and record whether it still answers.
Over 168 small utilities — converters, calculators, dev tools — running client-side in your browser with nothing uploaded, no account needed, and offline support once loaded.
FreeNo sign-upNothing to install
What to know▼
How it works
A collection of 168+ browser-based utilities — developer tools, image converters, text analytics, calculators, network utilities and more — that run entirely client-side.
What's different
Every tool runs in your browser so your data never leaves your device, works offline once loaded, and there's no account, paywall or ads on the tools themselves.
Pricing
Free.
Best for
Developers and everyday users who want quick one-off utilities without uploading data or creating an account.
We check every product on this page once a day and record whether it still answers.
A free suite of browser-based developer tools, JSON formatter, regex tester, cron builder, a WCAG accessibility checker, that runs client-side with no signup, ads, or data sent to a server.
FreeNo sign-upData stays with you
What to know▼
How it works
A small suite of browser-based dev tools — JSON formatter, regex tester, cron builder, WCAG contrast checker, and API request tester — that run entirely client-side.
What's different
No accounts, no ads, and no data sent to a server, unlike bookmarked dev-tool sites that get slower and ad-heavier over time.
Pricing
Free.
Best for
Developers who want quick utility tools without signing up or sending data to a server.
We check every product on this page once a day and record whether it still answers.
25 free browser tools — Base64/URL encoding, JSON formatting, regex testing, password strength checks, image compression, QR code generation and an AI content studio — all run instantly in-browser, no install or signup.
