Online Toolbox for Developers

100% Free · Runs Purely in Browser · Data Never Uploaded · Ready to Use

Encode & Decode （8 tools）

JSON Formatter

Beautify, minify, validate, convert to XML/CSV

JSON beautifyminifyvalidate

XML Formatter

Beautify, minify, validate, convert to JSON

XML beautifyto JSONvalidate

Base64 Encoder/Decoder

Base64 encode/decode for text and images

Base64encodedecodeimage

URL Encoder/Decoder

urlencode, urldecode, special character escaping

URL encodeescape

HTML Escape

HTML encode/decode, strip tags, entity conversion

escapeentity

Base Converter

Convert between binary, octal, decimal and hexadecimal

binaryoctalhexadecimal

CSV ↔ JSON Converter

Convert between CSV and JSON formats

CSV to JSONJSON to CSV

CSV ↔ Markdown Converter

Convert CSV to Markdown tables and back

CSVMarkdown table

Security （4 tools）

MD5/SHA Hash

Compute MD5, SHA1, SHA256, SHA512 hashes

hashencryption

AES/DES Encryption

Symmetric encryption, CBC/ECB modes, 3DES

AESDES3DES

JWT Decoder

Parse and verify JWT tokens, Header/Payload/Signature

JWTTokenauthentication

Password Generator

Secure random passwords, PINs, Diceware phrases

random passwordPINDiceware

Time & Date （3 tools）

Date Calculator

Date add/subtract, difference, workdays, age

date addworkdayscountdown

Cron Expression

Generate, parse, quick templates, next-run prediction

cronschedulercrontab

Unix Timestamp Converter

Unix timestamp converter, batch generate, timezone

timestampUnix timebatch

Text Tools （5 tools）

Regex Tester

Regex match, replace, debug and test

Regexmatchreplace

Text Diff

Compare text/code differences, side-by-side view

Diffcompareside-by-side

Text Tools

Case conversion, dedupe, sort, text statistics

casededupesort

Markdown Editor

Live edit & preview, WeChat theme, code highlight

Markdowneditor

Variable Name Converter

Convert between camelCase, snake_case and more (6 styles)

camelCasesnake_casenaming

Coding （11 tools）

Code Beautifier

Format & minify HTML/CSS/JS/SQL

HTML beautifyCSS beautifyJS beautify

UUID Generator

Generate UUID v4 in bulk, multiple formats

UUIDGUID

UserAgent Parser

Parse browser UA, detect device & OS

UAbrowserdevice

ASCII Table

Complete ASCII table, character reference

ASCIIcharacter code

IP Lookup

IP geolocation, region, ISP lookup

IP lookupgeolocation

URL Shortener

Shorten long URLs, custom slugs, history

short linkURL shorten

HTTP Status Codes

HTTP status code reference, categories, use cases

HTTPstatus codes404500

SQL Formatter

Beautify & minify SQL, syntax highlight, dialects

SQL beautifyMySQLformat

Subnet Calculator

CIDR calculation, IP range, usable hosts

subnet maskCIDRIP addressnetwork

Port Reference

TCP/UDP port reference, common service ports

portTCPUDPservice port

Robots.txt Generator

Crawler rules, SEO optimization, Sitemap config

robots.txtcrawler rulesSEO

Design Assets （5 tools）

Image Compressor

Client-side compression, quality control, batch

image compressbatchlocal

Image Converter

Convert PNG/JPG/WebP, resize, Base64

PNGJPGWebP

QR Code Generator

Generate QR codes for WiFi, URLs, text

QR codeQR

Color Converter

Convert between HEX, RGB, HSL, color picker

colorRGBHSL

CSS Gradient Generator

Linear & radial gradients, multi-color stops, CSS code

gradientCSS