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Most Popular Tools

The most frequently bookmarked tools by our users

Image Compressor

Compress JPG, PNG, and WebP images by up to 80% without losing quality.
Merge PDF

Combine multiple PDF files into one clean document instantly.
Word Counter

Count words, characters, sentences, paragraphs, and reading time in real time.
JSON Formatter

Format, validate, beautify, and minify raw JSON string inputs.
Password Generator

Generate secure, cryptographically random passwords with custom symbols.
QR Code Generator

Create custom QR codes for URLs, text, Wi-Fi, and contact details.
JPG to PDF

Convert JPG and PNG images into a clean single PDF file.
Case Converter

Convert text to UPPERCASE, lowercase, Title Case, camelCase, and snake_case.
Base64 Encoder

Encode text or images into standard Base64 format strings.
Percentage Calculator

Calculate percentage of values, percentage differences, and changes easily.
Color Picker

Pick colors from screen or image and export HEX, RGB, and HSL formats.
SERP Preview Tool

Simulate how your meta title and description appear in Google search results.

Why Choose TinyToolzz?

Built from the ground up for radical speed, privacy, and simplicity

Privacy First
Your files never leave your device. All processing occurs 100% locally in your web browser.
Lightning Fast
No server uploads or queues. Execution starts instantly and returns results in milliseconds.
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No subscription tiers, daily task limits, or hidden paywalls. 100% free forever for everyone.
Works on Any Device
Fully optimized for smartphones, tablets, laptops, and desktop viewports.
150+ Tools
A complete utility suite for images, PDFs, developer tasks, text, calculators, and converters.
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No artificial processing delays, fake progress bars, or deceptive sign-up pop-ups.

Frequently Asked Questions

Everything you need to know about using TinyToolzz

What is TinyToolzz?
TinyToolzz is a browser-based suite of online utilities for images, PDFs, text, developer code, calculators, and unit converters. Every tool runs directly inside your web browser.
Are all tools on TinyToolzz free?
Yes. All tools on TinyToolzz are 100% free with no premium plans, hidden subscriptions, or daily limits.
Do I need to create an account?
No. You never need to sign up, provide an email address, or log in to use any tool on TinyToolzz.
Is my data safe? Do files get uploaded to a server?
Your files and text inputs are completely private. All processing is performed client-side using JavaScript and Web APIs. Zero file data is ever transmitted to external servers.
Do the tools work on mobile devices?
Yes! TinyToolzz is designed mobile-first and works seamlessly across iOS Safari, Android Chrome, mobile browsers, tablets, and desktop computers.

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Contrast Checker

Check contrast between foreground and background colors for WCAG 2.1 compliance. See the ratio live with preview text and AA/AAA badges.

Large text 24px
Normal text 16px — The quick brown fox jumps over the lazy dog.
Contrast ratio
4.31 : 1
Foreground #FFFFFF on #2563EB
AA normal: Fail AA large: Pass AAA normal: Fail AAA large: Fail
Foreground luminance1.00
Background luminance0.12
Lighter#FFFFFF
Darker#2563EB
Recent pairs

Technical Specifications

WCAG luminance and threshold details.

Specification Details
Input Two HEX colors #RRGGBB or #RGB, optional #, case-insensitive, with native picker
Formula Contrast = (L1 + 0.05) / (L2 + 0.05), L = relative luminance per WCAG 2.1
Luminance Linear RGB: if RsRGB ≤ 0.03928 then R/12.92 else ((R+0.055)/1.055)^2.4, weighted 0.2126 R + 0.7152 G + 0.0722 B
Thresholds AA normal 4.5:1, AA large 3:1, AAA normal 7:1, AAA large 4.5:1, Graphics/UI 3:1
Large text 18pt (24px) or 14pt (18.66px) bold — shown as separate badges
Processing location 100% client-side JavaScript in your browser memory; nothing is uploaded
Export Copy ratio to clipboard or download report with luminance and badge results
Usage limit None — check unlimited pairs for free, no signup required

Features

🔍

Live WCAG Ratio

The ratio updates on every keystroke with 2-decimal precision and a clear pass/fail color.

👁️

True Preview

Your actual foreground on background is rendered as both large and normal text, so you see the result, not just numbers.

↔️

Swap and History

Swap with one click and keep the last 12 pairs. Click any history pair to restore it instantly.

🔒

Local Device Privacy

All math runs in your tab with plain JavaScript. Colors never leave your device.

How to Use the Contrast Checker

  1. Enter the foreground (text) HEX and the background HEX, or pick with the color boxes. The # is optional.
  2. Read the live preview — large and normal text rendered in your colors — and the contrast ratio below.
  3. Check the badges: AA normal (4.5:1), AA large (3:1), AAA normal (7:1), AAA large (4.5:1).
  4. Click Swap to exchange colors, or Copy Ratio to copy the result.
  5. Use history to revisit recent pairs — click any to restore.
  6. Click Download Report to save a text file, or Reset to return to white on blue.

Understanding Contrast

Contrast is the luminance difference between text and its background. WCAG measures it as a ratio from 1:1 (same color) to 21:1 (black on white). Higher ratios are easier to read, especially for low-vision users and in bright light.

When to require AA vs AAA

AA is the legal baseline for most sites, while AAA is the enhanced target for body copy. Many design systems require AAA for normal text and AA for large headings. Graphics and icons that convey meaning need 3:1, the same as AA large. Test both foreground and background choices in the Color Picker or derive palettes in the Color Palette Generator before finalizing.

Honest limitations

This checker uses sRGB luminance and does not model transparency, font smoothing or display brightness. A 4.5:1 ratio can still feel thin with light font weights — prefer 7:1 for long reading. History lives only in tab memory and clears when you close the page.

Privacy and Client-Side Security

Privacy Guarantee: All contrast calculations occur locally inside your browser. Your colors and history are never transmitted, stored, or recorded on remote servers.

Some checkers send pairs to a server for lookup. TinyToolzz keeps everything in-page: HEX parsing, luminance and ratio math run as plain JavaScript in your tab's memory.

Because nothing is uploaded, there is no waiting, no account, and no copy of your colors retained anywhere. Your values exist only in the tab's memory and are discarded when you close the page or click Reset.

Frequently Asked Questions

How is the contrast ratio calculated?
The ratio is (L1 + 0.05) / (L2 + 0.05) where L1 is the lighter and L2 the darker relative luminance from the WCAG formula. Luminance is derived from linear RGB with gamma correction.
What do AA and AAA mean?
WCAG 2.1 requires AA 4.5:1 for normal text and 3:1 for large text (18pt or 14pt bold). AAA requires 7:1 for normal and 4.5:1 for large. Graphics and UI components need 3:1 for AA.
What counts as large text?
Large text is 18pt (24px) or larger, or 14pt (18.66px) bold or larger. This tool shows separate pass/fail badges for normal and large so you can judge both.
Can I swap foreground and background?
Yes. Click Swap to exchange the two colors instantly. The ratio is the same either way, but the preview updates so you can see both directions.
Is my color pair sent to a server?
No. All luminance and ratio math runs 100% locally in your browser with JavaScript. Your colors and history are never transmitted, stored or logged anywhere. Closing the tab or clicking Clear removes them from memory immediately.
How do I fix a failing contrast?
Lighten the lighter color or darken the darker one, or adjust one channel at a time. The live preview helps you find the smallest change that reaches AA while keeping the palette intact.

Related Color Tools

Color Picker

Pick any color and copy HEX, RGB and HSL instantly.
Color Palette Generator

Create harmonious palettes from any base color.
Gradient Generator

Build linear and radial CSS gradients live.
HEX to RGB

Convert HEX color codes to RGB values instantly.
HEX to HSL

Translate HEX codes into HSL hue and lightness.
Random Color Generator

Generate random HEX and RGB colors with one click.