100% Client-Side Browser Utilities
Eurika is a growing suite of free, fast, and beautiful tools that run entirely in your browser. Because we use a strict zero-upload architecture, your files and data never touch our servers. No accounts required.
Available Tools
Each tool is completely free, runs in your browser, and never sends your content to a server.
QR Code Generator
Create custom QR codes with gradients, logos, 15+ content types: URLs, WiFi, email, TOTP, geo, and more.
Try it freeEurika ColorStudio
Extract palettes from images, build CSS gradients, and pick precise colors in one unified workspace.
Try it freeSafe Zone Viewer
Preview your TikToks and Reels to ensure important text and visuals aren't blocked by UI elements.
Try it freeDiscord Timestamp Generator
Easily generate dynamic Unix timestamps for Discord messages. Automatically adapts to local timezones.
Try it freeMore tools are in active development. Stay tuned!
15+ QR Code Types
Our QR generator supports far more than just URLs. Create codes for WiFi networks, email, phone, authenticator apps, and more.
URL
Link to any website
WiFi
WPA, Open, WEP, Enterprise
Pre-fill recipient & body
Phone / SMS
One-tap dial or message
TOTP / OTP
Authenticator enrollment
Geo Location
Share GPS coordinates
Direct chat link
Amazon
Product link by ASIN
Advanced Color Management
Build stunning visuals with robust color tools. Extract from images, mix gradients, and manage CSS tokens easily.
Image Palettes
Extract colors from any photo
CSS Gradients
Linear and radial builder
Color Picker
HEX, RGB, HSL support
Export
Copy CSS instantly
Social Media Safe Zones
Avoid the UI overlap. Test your vertical videos against the actual UI layers of popular social platforms.
TikTok
For You Page layout
Instagram Reels
Reels UI overlays
YouTube Shorts
Shorts player layout
Custom Guides
Toggle UI elements
Perfect Discord Timing
Stop guessing timezones. Use dynamic timestamps that automatically display correctly for every user.
Relative Times
"in 2 hours", "3 days ago"
Absolute Times
Full dates and exact times
Short Times
Compact time formats
Auto Copy
One-click clipboard copy
Local by Design
We built Eurika with a strict zero-upload architecture. All processing happens locally on your device.
Zero server uploads
Every tool runs in your browser using JavaScript. The content you enter is processed on your device and never sent to our servers.
No accounts required
Use any tool instantly. We don't ask for your email, name, or any personal information.
Transparent about ads
To keep these tools 100% free, this site is supported by Google AdSense, which uses tracking cookies to serve personalized ads.
Frequently asked questions
Everything you might want to know about Eurika's free browser tools.
Are these tools really free?
Yes, completely. There's no paywall, no free trial, and no premium tier — every tool is free forever. The site is supported by Google AdSense.
Do you store my files or data?
No. Every tool runs 100% in your browser using JavaScript. Files, images, QR content, and timestamps never leave your device and are never sent to any server.
Do I need to create an account?
No account is required for any tool, now or in the future. Just open a tool and start using it.
Why do I see ads?
Ads served by Google AdSense are how we keep the tools free. You can manage your ad preferences using the link in the footer.
Can I use these tools offline?
Once the page has loaded, most tools — the QR generator, ColorStudio, and Discord timestamps — keep working even if you lose your internet connection. The Safe Zone Viewer also works offline once loaded.
How many QR codes can I generate?
Unlimited. There are no daily limits, no watermarks, and no registration required.
What image formats does Color Studio support?
JPEG, PNG, WebP, GIF, and most other browser-supported formats. Files are read directly in your browser.
Is this site safe for work, school, or sensitive content?
Yes. Nothing you enter is transmitted or logged. The only third-party code running on the site is Google AdSense, which serves the ads.