U means URL
If you're a developer, you'll recognize U301 as a straightforward name. U301 stands for URL 301, where 301 is an HTTP status code that indicates a permanent redirect. This is the core technology behind URL shortening: setting up a code that uses HTTP 301 redirects to forward users to your target destination.
U means Ultimate
URL shortening is part of the internet's core infrastructure. While we see computer hardware constantly evolving with decreasing costs, popular URL shortening services in the market still charge expensive fees. For example, free plans often limit you to just dozens of URLs per month, which is unreasonable — each URL takes up minimal database space and generates negligible traffic overhead. U301 provides the ultimate service: once you use it, you won't need any other URL shortening service.
U means Unique
Every short URL is unique, permanently valid, and serves as your own personal gateway to the internet. You can modify the target destination at any time, but the short URL itself remains unchanged.
U means You
We approach many issues from your perspective. That's why we support free custom domain binding for branded services and offer generous free quotas with affordable PRO pricing. We take pride in operating an essential internet service: URL Shortener for Everyone.
Knowledges
What's the difference between 301 and 302?
HTTP 301 and 302 are both redirect status codes, but they serve different purposes and have distinct implications for SEO and user experience.
301 Redirect (Permanent Redirect) A 301 redirect indicates that the requested resource has been permanently moved to a new location. This tells search engines and browsers that the original URL should be replaced with the new one in their records.
302 Redirect (Temporary Redirect) A 302 redirect indicates that the requested resource has been temporarily moved to a different location. The original URL is expected to be restored in the future.
Comparison Table
| Aspect | 301 Redirect | 302 Redirect |
|---|---|---|
| Purpose | Permanent move | Temporary move |
| SEO Impact | Transfers link equity to new URL | Keeps link equity with original URL |
| Search Engine Behavior | Updates index with new URL | Keeps original URL in index |
| Browser Caching | Cached indefinitely | Cached for shorter periods |
| Use Cases | Domain changes, URL restructuring, content migration | Maintenance pages, A/B testing, temporary content moves |
| Link Juice Transfer | ~90-99% of ranking power transferred | No ranking power transferred |
| User Bookmarks | Should be updated to new URL | Original URL remains valid |
| Implementation | Location: https://new-url.com + Status: 301 | Location: https://temp-url.com + Status: 302 |
When to Use Each
Use 301 when:
- Moving your website to a new domain permanently
- Changing URL structure permanently
- Consolidating duplicate content
- Removing old pages permanently
Use 302 when:
- Temporarily moving content for maintenance
- Running A/B tests with different URLs
- Redirecting mobile users to a mobile-specific page
- Temporarily moving content while keeping the original URL active