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NewAPI Request Builder and 5 more just shipped

Paste anything. Get the answer. Nothing leaves your browser.

Drop in a JWT, JSON, CSV, Base64 or cURL and Smart Paste opens the right tool, or chains the steps for you in Pipeline Studio. 74 free tools, offline-ready, no sign-up, and your input never touches our servers.

Smart Paste · paste anything, we pick the tool and the pipeline

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Also: 10 cheat sheets · AI Lab

  • Private by defaultYour input never touches our servers
  • Works offlineInstall it as a PWA
  • No sign-upFree, no account, no paywall
  • Open in any browserDesktop or Android, nothing to install

5 optional AI tools send text to the Hugging Face API and are labelled on their cards. We use Google Analytics for anonymous page stats.

Pipeline Studio

Chain tools into one-click workflows.

Stop copy-pasting between tabs. Stack 41 transforms (repair, convert, decode, hash, encode) into a pipeline that runs locally, then share it as a link whose state lives in the URL, not a database.

  • 6 ready-made recipes, from JWT decoding to YAML minifying
  • Runs step by step in your browser with live output
  • Shareable links with no account and no upload
Try Pipeline Studio
Repair Python Dict & Convert to CSV
Input
[{'id': 101, 'name': 'Alpha', 'active': True}, {'id': 102, 'name': 'Beta', 'active': False,}]
1Repair JSON / Python Dict
2JSON → CSV Table
Output
id,name,active
101,Alpha,true
102,Beta,false

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Featured tools

The everyday utilities developers reach for first.

All 74 tools
JSON Formatter

Beautify and format JSON with syntax highlighting

Developer
JSON Repair & Fixer

Repair malformed JSON, unquoted keys, Python dicts, and trailing commas

Developer
JWT Decoder

Decode and inspect JSON Web Tokens client-side

Developer
Subnet Calculator & CIDR

Calculate IPv4 subnets, CIDR masks, network & broadcast IPs, and usable host ranges

Developer
JSON to Zod Schema

Convert JSON payloads into Zod validation schemas and TypeScript types

Developer
cURL to Code Converter

Convert cURL commands to JavaScript Fetch, Axios, Python & Go

Developer
Diff Checker

Compare code and text with unified diff patch generation

Developer
Regex Tester

Test regular expressions with live match highlighting

Developer

Changelog

Recently added

The newest tools in the kit.

API Request Builder
NEW
Sends real requests

Build, send and debug HTTP requests with cURL import and export

Developer
SVG to CSS & Data URI Generator
NEW

Convert SVG vectors into CSS background-image, mask-image, Tailwind classes & Data URIs with live preview

Developer
.htpasswd & HTTP Basic Auth Generator
NEW

Generate Apache APR1-MD5 & SHA-1 .htpasswd hashes, verify existing lines, and build Basic Auth headers

Developer
.env Multi-Format Converter & Secrets Masker
NEW

Convert .env files into JSON, YAML, Docker Compose, Kubernetes ConfigMap & Secret, with 1-click secrets masking

Developer
JSONPath Tester & Query Evaluator
NEW

Test and evaluate JSONPath expressions (RFC 9535) against JSON payloads with live node highlighting

Developer
CSS Box Shadow & Glassmorphism Generator
NEW

Design multi-layer smooth box shadows and frosted glassmorphism UI with real-time CSS & Tailwind export

Developer

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Quick references

10 cheat sheets, one click from the tool.

Searchable references for the commands you always forget, with deep links into the matching tool.

Browse cheat sheets

From the maker of DevToolkit Hub

Ship safer, spend less on CI

Two tools for teams that live in GitHub Actions.

FAQ

Questions, answered

Are my tokens, JSON payloads, or code snippets uploaded to your servers?

No. DevToolkit Hub has no backend that receives your input: tools run in your browser using Web APIs and Web Workers. The exceptions are 5 optional AI tools, labelled "Uses HF API" or "Optional HF API", which send the text you submit directly from your browser to the Hugging Face Inference API. The site uses Google Analytics for anonymous page-view statistics, which never includes what you type into a tool.

How is DevToolkit Hub different from CyberChef, DevToys, or generic converter sites?

It is free, needs no install or account, and keeps your data in the browser. Pipeline Studio chains multi-step transformations, share links keep state in the URL hash (#share=...) instead of a database, and the whole site installs as an offline-capable PWA.

Can I use DevToolkit Hub offline?

Yes. DevToolkit Hub ships a service worker and web app manifest. Install it from your browser on desktop or Android and the on-device tools keep working without a connection. AI tools that call Hugging Face need a connection.

Is DevToolkit Hub free?

Yes. All 74 tools, 10 cheat sheets, and Pipeline Studio are free, with no sign-up, subscription, or credit card.

What tools are available?

74 tools across Developer, Text, Image, Student, and Career categories, including Subnet & CIDR Calculator, JSON Repair & Formatter, JWT Decoder, CSV/JSON/YAML converters, JSON to Zod, JSON to TypeScript, cURL Converter, SVG to JSX, Chmod Calculator, Cron Parser, Regex Tester, UUID Generator, Hash Generator, and AI Text Humanizer.

Your next paste deserves better than a random converter site.

74 tools, 10 cheat sheets and Pipeline Studio. Free, private, and ready offline.

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