There is a quiet problem with most shortened URLs. They look like this: trm.z/x7kQ9p. A random jumble of characters that tells the recipient absolutely nothing about where the link leads. In a world where phishing attacks and malicious links are a daily reality, asking someone to click on a string of nonsense is asking for a lot of trust.
We built custom aliases to solve this problem entirely.
What Custom Aliases Actually Change
With Plung, instead of sharing plung.co/x7kQ9p, you can share plung.co/spring-sale or plung.co/my-portfolio or plung.co/join-us. The difference is not cosmetic. It is functional.
A readable link communicates intent before the click happens. The person receiving it can immediately understand where they are going and why. This single change increases click-through rates, reduces hesitation, and eliminates the "is this link safe?" friction that kills engagement.
How It Works
When you shorten a URL on Plung, you will see an optional field to enter a custom alias. Type any combination of letters, numbers, and hyphens. If the alias is available, it is yours instantly. No account needed, no approval process, no waiting.
Behind the scenes, we run the alias through the same security and validation pipeline as every other link on our platform. Aliases that attempt to impersonate other brands, contain offensive content, or violate our terms are automatically rejected. This keeps the alias namespace clean and trustworthy for everyone.
The Engineering Behind Instant Availability Checks
One of the subtle challenges we solved was making alias availability checks feel instant. When you type a custom alias, we need to verify that it has not already been claimed, that it does not collide with any reserved system paths, and that it passes our content filters. All of this happens in under 50 milliseconds.
We achieve this through a combination of in-memory caching at the edge, bloom filters for rapid negative lookups, and a final authoritative check against our primary datastore. The result is that you get real-time feedback as you type, with no perceptible delay.
Best Practices for Choosing Aliases
Not all aliases are created equal. Here are some principles we have observed from studying millions of shortened links:
Keep it short and specific. The whole point of a URL shortener is brevity. An alias like plung.co/2026-annual-report is better than plung.co/download-the-2026-annual-financial-report-pdf.
Use hyphens for readability. Multi-word aliases are much easier to read with hyphens: plung.co/spring-sale versus plung.co/springsale. This also matters when sharing links verbally, like in a podcast or presentation.
Match the context. If you are sharing the link on a business card, make the alias professional. If it is going in a social media bio, keep it catchy. The alias should fit the medium.
A Small Feature with Outsized Impact
Custom aliases are one of those features that seems minor on the surface but fundamentally changes how people interact with your links. They transform a disposable, forgettable redirect into a branded touchpoint that reinforces trust and recognition every time someone sees it.
And like everything else on Plung, it is completely free. No premium tiers, no upsells. Just paste your URL, choose your alias, and share with confidence.
Written by
Plung Team