Free online developer tools

502 tools

Small utilities developers reach for daily: JSON and YAML formatters, Base64 and URL encoders, regex testers, JWT decoders, diff viewers and cron helpers. Prefer tools marked as running in your browser when you paste tokens, keys or production data, because nothing is uploaded.

Showing 1–24 of 502

0.886score
Svelte Playground
Svelte team
Write Svelte components in the browser with a live preview and shareable URL.
ArtifactNo sign-up★ 88.5Kdeveloper tools
0.874score
Vue SFC Playground
Vue team
Edit Vue single-file components and see the compiled result and preview instantly.
ArtifactNo sign-up★ 54.8Kdeveloper tools
0.873score
Hoppscotch
hoppscotch
An open-source API client for building and testing REST and GraphQL requests, usable in the browser.
Artifact★ 80.7Kdeveloper tools
0.867score
IT Tools
Corentin Thomasset
Collection of small developer utilities such as encoders, hash generators, converters and calculators, grouped in one app.
ArtifactNo sign-up★ 41.1Kdeveloper tools
0.866score
ShellCheck
ShellCheck
Analyses shell scripts online and points out bugs and portability problems.
ArtifactNo sign-up★ 40.3Kdeveloper tools
0.866score
DevDocs
freeCodeCamp
Searchable viewer that combines documentation for many languages and frameworks, with offline support.
ArtifactNo sign-up★ 39.6Kdeveloper tools
0.862score
SWC Playground
SWC
Transpile or minify JavaScript and TypeScript with the SWC compiler and adjustable options.
ArtifactNo sign-up★ 34.2Kdeveloper tools
0.858score
Repomix
yamadashy
Packs a local or remote repository into a single AI-friendly file in XML, Markdown, JSON or plain text.
ArtifactNo sign-up★ 29.1Kdeveloper tools
0.858score
Swagger UI Petstore
SmartBear
Live Swagger UI demo that lets you load a spec URL and try its endpoints.
ArtifactNo sign-up★ 29.1Kdeveloper tools
0.857score
NGINXConfig
DigitalOcean
Builds an nginx server configuration from form options for performance and security.
ArtifactNo sign-up★ 28.3Kdeveloper tools
0.857score
Shields.io
Shields.io
Creates README-ready status badges for repositories, builds and downloads.
ArtifactNo sign-up★ 27.3Kdeveloper tools
0.855score
ReDoc Demo
Redocly
Interactive demo showing how ReDoc renders an OpenAPI spec as a three-panel API reference.
ArtifactNo sign-up★ 26Kdeveloper tools
0.855score
v86
Fabian Hemmer
x86 PC emulator in WebAssembly that boots Linux, KolibriOS and older Windows.
ArtifactNo sign-upIn-browser★ 23.6Kdeveloper tools
0.848score
Compiler Explorer
Matt Godbolt
Shows the assembly a chosen compiler produces for C++, Rust, Go and many other languages.
ArtifactNo sign-up★ 19.2Kdeveloper tools
0.845score
WebVM
Leaning Technologies
Linux virtual machine that runs in the browser through WebAssembly.
ArtifactNo sign-up★ 17.5Kdeveloper tools
0.844score
Gitmoji
Carlos Cuesta
Searchable list of emojis with meanings, used to label commit messages by intent.
ArtifactNo sign-up★ 16.8Kdeveloper tools
0.844score
typescript-eslint Playground
typescript-eslint
Try ESLint and TypeScript-ESLint rules and inspect the AST in the browser.
ArtifactNo sign-up★ 16.5Kdeveloper tools
0.844score
Pyodide Console
Pyodide
Interactive Python console that runs CPython compiled to WebAssembly inside the page.
ArtifactNo sign-upIn-browser★ 14.9Kdeveloper tools
0.843score
Gitingest
coderamp-labs
Turns a Git repository into one text digest of its code and structure for pasting into an LLM.
ArtifactNo sign-up★ 16.1Kdeveloper tools
0.840score
explainshell
explainshell
Matches each part of a shell command with the manual-page text that explains it.
ArtifactNo sign-up★ 14.3Kdeveloper tools
0.840score
quicktype
quicktype
Generates typed models in many languages from JSON, JSON Schema or GraphQL samples.
ArtifactNo sign-up★ 13.9Kdeveloper tools
0.839score
httpbin
Kenneth Reitz and Postman
Public HTTP request and response service for testing clients, with endpoints for headers, status codes and delays.
ArtifactNo sign-up★ 13.6Kdeveloper tools
0.832score
RegExr
gskinner
Builds and tests JavaScript or PCRE regular expressions with live highlighting, contextual help and a searchable community library.
ArtifactNo sign-up★ 10.4Kdeveloper tools
0.831score
Bundlephobia
Bundlephobia
Reports the install and bundle size cost of an npm package.
ArtifactNo sign-up★ 9.6Kdeveloper tools