Format and validate developer data
Clean JSON, XML, SQL, URLs, Base64, hashes, and timestamps without leaving the browser.
Free browser-based utilities
Online tools for developers, creators, images, PDFs, and calculators
Use 70 focused tools for formatting, conversion, image optimization, creator workflows, and everyday calculations. Most tools run locally in your browser, so your text, code, and files stay on your device.
JSON Formatter
Validate, beautify, and minify your JSON data with tree view and syntax highlighting.
URL Encoder
Quickly encode or decode URL components, parameters, and special characters safely.
Base64 Converter
Convert plain text or binary data to Base64 and back. Support for Data URIs included.
Hash Generator
Generate MD5, SHA-1, SHA-256, and other cryptographic hashes from text or files instantly.
QR Code Generator
Create customizable QR codes for URLs, text, contact info, and more with download options.
HTML Encoder
Encode and decode HTML entities to prevent XSS and display special characters safely.
UUID Generator
Generate unique identifiers (UUIDs) in various versions for your applications and databases.
Unix Timestamp
Convert between Unix timestamps and human-readable dates in multiple formats and timezones.
Markdown Viewer
Preview and convert Markdown to HTML with live rendering and syntax highlighting support.
Image Resizer
Resize images instantly in your browser. Adjust width, height, and format with aspect ratio lock.
Image Compressor
Compress images with adjustable quality. Reduce file size while preserving visual quality.
PDF Compressor
Reduce PDF file size by re-optimizing the document structure. All processing in your browser.
PDF Merge
Combine multiple PDF files into one document. Reorder pages and download the merged result.
URL Shortener
Shorten long URLs for easier sharing using free public APIs. No sign-up required.
Password Generator
Generate strong, random passwords with customizable length and character options.
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words for your designs and layouts.
Text Diff
Compare two texts side by side and highlight the differences between them instantly.
JSON to CSV
Convert JSON arrays to CSV format for spreadsheets. Handles nested objects and arrays.
CSV to JSON
Parse CSV data into JSON arrays instantly. Auto-detect delimiters and headers.
XML Formatter
Beautify, minify, and validate XML documents with proper indentation and syntax checking.
Regex Tester
Test regular expressions with real-time matching, highlighting, and capture group display.
Color Converter
Convert colors between HEX, RGB, HSL, and HSB formats with a live color preview.
Color Contrast Checker
Check WCAG color contrast ratios between text and background for accessibility compliance.
Icon Converter
Generate favicon-ready PNG icons at standard sizes (16x16 to 256x256) from any image.
Image Format Converter
Convert images between JPG, PNG, and WebP formats instantly in your browser.
File Size Calculator
Convert between file size units: bytes, KB, MB, GB, and TB with precision control.
GIF Maker
Create animated GIFs from multiple images with customizable frame delay and loop options.
GIF Compressor
Reduce GIF file size by optimizing colors, dimensions, and frame count.
Color Palette Extractor
Extract dominant colors from any image and generate beautiful color palettes.
Gradient Generator
Create beautiful CSS gradients with a visual editor. Copy CSS code with one click.
Thumbnail Size Calculator
Calculate and resize thumbnails for YouTube, Instagram, Twitter, and more platforms.
Social Image Size Guide
Complete guide to image dimensions for all major social media platforms in 2026.
Icon Color Changer
Change the color of SVG and PNG icons instantly. Preview and download in any color.
Image Metadata Remover
Strip EXIF, GPS, and other metadata from images to protect your privacy before sharing.
Salary After Tax
Calculate your net salary after South Korean income tax and social insurance deductions.
Monthly Salary Calculator
Calculate monthly take-home pay with South Korean tax brackets and insurance premiums.
Severance Pay Calculator
Calculate severance pay based on Korean labor law. Enter work period and average wage.
Pension Calculator
Simulate DB and DC pension plans for Korean retirement planning. Compare returns.
Tax Refund Calculator
Estimate your year-end tax refund in South Korea based on deductions and credits.
Mortgage Calculator
Calculate monthly mortgage payments with principal and interest amortization schedule.
Loan Interest Calculator
Calculate simple and compound interest on loans. Compare different repayment schedules.
Credit Card Interest Calculator
Calculate installment and revolving credit card interest to manage your finances better.
Currency Converter
Convert between world currencies with live exchange rates from a free public API.
Inflation Calculator
Calculate the impact of inflation on purchasing power over time with adjustable rates.
BMI Calculator
Calculate your Body Mass Index with height and weight. See your BMI category and health range.
Calorie Calculator
Calculate daily calorie needs using the Mifflin-St Jeor equation based on your activity level.
Health Insurance Calculator
Calculate Korean national health insurance premiums based on your income and employment type.
Word Counter
Count words, sentences, paragraphs, and reading time in any text. Free online word count tool.
Character Counter
Count characters with and without spaces, words, and lines. Perfect for social media limits.
Text Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.
HTML Minifier
Minify HTML by removing whitespace, comments, and optional tags. Reduce file size instantly.
CSS Minifier
Minify CSS by removing whitespace, comments, and redundant code. Optimize stylesheets instantly.
JS Minifier
Minify JavaScript by removing whitespace, comments, and shortening code. Reduce bundle size.
Time Zone Converter
Convert time between time zones worldwide. Compare multiple time zones and find the best meeting time.
Health Insurance Voluntary
Compare voluntary continuation vs regional health insurance premiums after leaving employment in Korea.
가상자산 세금 계산기
한국 가상자산 과세 기준에 맞춰 기본공제 250만원과 22% 세율 기준 예상 세액을 계산합니다.
상속 및 증여세 계산기
상속세와 증여세 예상 세액을 누진세율과 관계별 공제를 반영해 계산합니다.
실업급여 계산기
평균 월급, 나이, 고용보험 가입 기간을 기준으로 실업급여 예상 금액과 수급일수를 계산합니다.
프리랜서 세금 3.3% 계산기
프리랜서 3.3% 원천징수, 실수령액, 예상 종합소득세, 환급 또는 추가 납부액을 계산합니다.
전역일 계산기
입대일과 복무 구분을 기준으로 전역 예정일, D-Day, 복무 진행률을 계산합니다.
AI Prompt Generator
Generate structured AI prompts by combining role, task, and tone templates for better results.
Readability Score
Analyze text readability with Flesch-Kincaid, Gunning Fog, and Coleman-Liau index scores.
UTM Builder
Build campaign URLs with UTM parameters (source, medium, campaign) for marketing analytics tracking.
SQL Formatter
Format and beautify SQL queries with proper indentation, keyword highlighting, and dialect support.
Unit Converter
Convert between units of length, weight, temperature, and shoe sizes with instant results.
Font Pair Preview
Preview Google Font pairings with live text samples. Find the perfect heading and body font combination.
Instagram Line Break
Add invisible line breaks to Instagram captions using zero-width spaces for clean formatting.
Profile Photo Cutter
Crop images into a perfect circle for profile photos using Canvas arc and clip. Download as PNG.
Subtitle Length Checker
Check subtitle line lengths against the 15–20 character guideline with visual per-line feedback.
YouTube Revenue Calculator
Estimate YouTube ad revenue based on views and CPM. Calculate potential earnings per video.
Popular workflows
Tinker Tools is organized around repeatable browser workflows: inspect data, prepare assets, calculate decisions, and publish content faster.
Prepare images for web and social
Resize, compress, convert, strip metadata, extract colors, and generate production-ready assets.
Plan content, campaigns, and creator work
Check readability, build UTM URLs, estimate creator revenue, and keep captions within platform limits.
Why use Tinker Tools?
Small browser utilities work best when they are quick, predictable, and private. Instead of installing a desktop app or pasting sensitive input into a remote service, you can open a single-purpose tool, run the task, copy the result, and move on.
Each page explains what the tool does, how it works, practical use cases, and related tools. That structure helps people find the right utility through search and gives AI answer engines clear, text-based context when they summarize tool options.
Need a custom workflow tool for a team or small business? Contact Tinker Tools for browser-based automation, internal admin tools, and operational workflow systems.