Spark8 Online Toolbox
97 free online tools, no registration required. The productivity partner for developers, designers, and creators.
Dev & Design
JSON Formatter
Format, compress, and validate JSON data online
Base64 Encoder/Decoder
Encode and decode Base64 strings
Timestamp Converter
Convert between Unix timestamps and dates
Regex Tester
Test and debug regular expressions online
UUID Generator
Generate UUID / GUID online
Color Picker
Online palette and color format converter
Diff Checker
Compare text and code differences side by side
YAML Formatter
Online format and validate YAML data
XML Formatter
Format and validate XML online, with XML/JSON conversion
Text Cleaner
Remove empty lines, deduplicate, trim, and convert case
Case Converter
Convert text between uppercase, lowercase, camelCase, snake_case, kebab-case and more, with full Unicode support
SQL Formatter
Online format and beautify SQL statements
Color Palette Generator
Build complementary, analogous, triadic and monochrome palettes from one base color with WCAG contrast checking and CSS variable export
Cron Generator
Visually generate cron schedule expressions
JWT Decoder
Decode and inspect JWT tokens
CSS Gradient Generator
Visually create CSS gradient backgrounds
WebSocket Test
Online WebSocket connection debugger
Code Beautify / Minify
Online HTML/CSS/JS beautify and minify
Chinese Simplified ↔ Traditional
Convert between simplified and traditional characters in bulk
Mock Data Generator
Generate names, addresses and phone numbers for testing
Daily & Office
QR Code Tool
Generate and scan QR codes, with Logo overlay and SVG export
Barcode Generator
Generate CODE128/EAN/UPC barcodes online
Signature Pad
Handwrite signature, export PNG/SVG
Password Generator
Generate secure random passwords
Todo List
Lightweight task management for daily tracking
Quick Notes
Markdown notes to capture your ideas anytime
IP Lookup
Query IP address location and details
My IP
Instantly check your IP, location, and ISP info
IP Map
Batch IP geolocation lookup with map display
Word Counter
Count words, characters, lines and paragraphs
World Clock
Current time in major cities worldwide
Unit Converter
Convert length, weight, temperature, area and more
Pinyin Writing Practice
Generate pinyin worksheets with grid or line mode, download as PDF
Text to Speech
Turn text into natural speech right in your browser
Emoji & Symbols
Browse emojis, kaomoji and special symbols, one-click copy
Invoice Generator
Create free invoices and bills online with auto line totals, print or save as PDF — data never leaves your device
Image & Docs
Image Compressor
Compress images online, supports JPG/PNG/WebP
Image Converter
Convert between JPG/PNG/WebP/GIF formats
SVG to PDF
Convert SVG files to PDF documents online
OCR Recognition
Extract text from images, multilingual support
PDF Toolkit
Merge, split, and compress PDFs in one place
Image Cropper
Crop, round corners, and add watermarks online
Markdown Preview
Live Markdown rendering with HTML export
EXIF Viewer
View photo metadata, camera settings and location
Image Compare
Compare two images with a slider
Placeholder Image
Generate custom-size placeholder images
Favicon Generator
Convert images to ICO/PNG multi-size icons
Image Watermark
Add text watermarks to images online
Grid Crop
Split images into grid pieces
AI Background Remover
Free online AI background remover: strip an image background in one click and export a transparent PNG. Perfect for ID photos and product shots - runs in your browser.
Encrypt & Security
Hash Generator
Calculate MD5 / SHA1 / SHA256 / SHA512 hashes
URL Encoder/Decoder
Encode and decode URLs
AES Encrypt/Decrypt
AES-256-GCM symmetric encryption tool
RSA Encrypt/Decrypt
RSA asymmetric encryption with key pair generation
HTML Entity Encoder
Encode and decode HTML entities
Password Strength Checker
Check password security strength with improvement suggestions
Query & Calc
Currency Converter
Real-time exchange rates for multiple currencies
Mortgage Calculator
Calculate monthly payments for equal payment or equal principal methods
Number Base Converter
Convert between binary, octal, decimal and hex
Phone Lookup
Find carrier and region info for phone numbers
ID Card Validator
Validate Chinese ID card numbers with age and gender parsing
Tax Calculator
Calculate income tax and take-home pay
Date Calculator
Days between dates, working days, date offsets and countdowns
BMI & Health Calculator
BMI, basal metabolism and daily calorie estimates
Calorie Calculator
Calculate daily calorie needs (TDEE), basal metabolic rate (BMR) and plan your diet for weight loss or muscle gain
Tip & Bill Splitter
Work out tips, tax and the amount per person
Auto Loan Calculator
Calculate monthly car payments, total interest and amortization schedule
Percentage Calculator
Quickly calculate percentages, discounts, increases, decreases and ratios
Age Calculator
Calculate exact age in years, months and days from your date of birth, with next birthday countdown
Salary Calculator
Convert between annual, monthly and hourly pay rates, estimate take-home pay
Webmaster & SEO
UTM Builder
Quickly generate campaign tracking links (utm_source / medium / campaign)
Robots.txt Generator
Generate search engine crawling rules online
Sitemap Generator
Generate XML sitemap for your website
WhoIs Lookup
Query domain registration and expiry information
SSL Checker
Check HTTPS certificate validity and configuration
DNS Lookup
Query DNS records (A/AAAA/MX/CNAME)
Ping Test
Test network latency to global endpoints
Open Graph Preview
Preview how your page appears on social media
Meta Tag Generator
Generate title, description, Open Graph and Twitter Card meta tags online, ready to copy and paste
Hashtag Generator
Turn any text into relevant hashtags with platform-friendly limits for Instagram, Twitter, TikTok and YouTube
Teacher Tools
Roll Call
Random/sequential roll call with probability control and attendance tracking
Smart Seating
Constraint-based seating arrangement with cinema-style layout
Random Grouping
Classroom grouping with constraints support
Grade Analysis
Grade statistics, rankings, distribution charts
Timetable Maker
Visual timetable editor with drag-and-drop
Class Timer
Fullscreen countdown, pomodoro, break timer
Class Vote
Quick voting and polling for classroom
Random Quiz
Question bank random picker
Noise Meter
Real-time classroom noise detection
Free Online Typing Practice - No Signup Speed Test & Touch Typing Trainer
Free online typing practice: live WPM and accuracy, falling-word arcade, article tracing, graded word cards. No sign-up - data stays on your device.
Other Tools
M3U8 Player
Stream M3U8/MP4 video online
Audio Converter
Convert audio in the browser: FLAC to MP3, WAV to MP3, OGG to MP3 and more, with one-click batch processing. Everything runs locally, no uploads.
User-Agent Parser
Parse browser and device UA strings
HTTP Status Codes
Complete HTTP status code reference
Daily Poem
A random classical poem every day
Countdown Timer
Online countdown, stopwatch and timer
Lottery Draw
Event lottery, raffle draw with fullscreen display