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Free Online Dev Tools
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40 -, backend, frontend .
. , - , IDE .
DotNetFiddle

DotNetFiddle, C#, F# VB.NET.
JSFiddle

JSFiddle, JavaScript. JavaScript, vanilla JavaScript, CoffeeScript, Babel, TypeScript, Vue, React .
OnlineGDB

OnlineGDB - - C, C++, Python, PHP, Ruby, C#, VB, Perl, Swift, Prolog, Javascript, Pascal, Bash .
IdeOne

IdeOne, .
VScode

Visual Studio Code Microsoft
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JSONLint

JSONLint JSON, . , URL- JSONLint JSON.
SAML Developer Tools

SAML Developer Tools , (SAML - Security Assertion Markup Language). XML , , .
Web Formatter

Web Formatter, HTML, XML, CSS, JavaScript, PHP JSON . , .
Code Beautify

Code Beautify , , , .. .
Swagger Editor

Swagger Editor API Swagger YAML .
SQLime

SQLime - SQLite SQL.
TablesGenerator

TablesGenerator - LaTeX, HTML, Markdown, MediaWiki .
JWT Debugger

JWT .
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Carbon

Carbon, . , .
Hilite

Hilite HTML, , -. , Highlight!. HTML , CSS JavaScript .
QuickType

HTML Encoder

HTML Encoder, HTML . .
HTML Decoder

HTML Decoder, , HTML, . .
URL Encoder/Decoder

URL Encoder/Decoder, URL.
Base64 Encode

Base64 Encode Base64 .
Hash Online Tools

(SHA256, MD5 ) Hash Online Tools
PineTools

PineTools - , , , ( ) .
. , , Photoshop.
PhotoPea

, Photoshop, PhotoPea .
Pixlr

Pixlr 1 . , . , - , .
Lunapic

Lunapic - , - . , .
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ResizePng

ResizePng - Portable Network Graphics (PNG). PNG , PNG- . , .
ResizeImage

ResizeImage, , , , , , , , , .
Img2Go

Img2Go, . , .
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Regex101

Regex101 , . , , , .
Markup Validation Service

Markup Validation Service - HTML, XHTML, SMIL, MathML .. - , , RSS/Atom CSS, MobileOK, , . , DTD.
PingDom

PingDom . , , - , , .. . , , , - -.
Minifier

Minifier , , / . .
Online UUID Generator

Caniuse

Caniuse HTML/CSS/JS .
ReqBin

Piesocket Websocket Tester

SEO translit

Diagrams.net

diagrams.net ( draw.io) - .
Any API

Any API 1400 API
CSS3 Generator

CSS3 Generator , box-shadow, , . , .