The SwiftLink blog

What Is a URL Shortener and How Does It Work?

A URL shortener takes a long web address — the kind with tracking parameters, session IDs and endless path segments — and gives you a short, clean link that points to the same place. When someone opens the short link, the service redirects their browser to the original destination.

The anatomy of a short link

Every short link has two parts: a domain and a code. The domain is the shortener's address (or your own branded domain), and the code is a short string like aB3x9Q that uniquely identifies your destination. Services like SwiftLink generate these codes randomly from an unambiguous alphabet — no confusing lookalikes like 0 vs O or 1 vs l.

What happens when someone clicks

1. The browser requests the short URL.
2. The shortener looks up the code in its database and finds the destination.
3. The server responds with an HTTP redirect (usually a 302 Found, or 301 Moved Permanently for links that will never change).
4. The browser follows the redirect to the destination — typically in well under a second.

That redirect step is also where analytics happen: the click is logged with its timestamp, referrer, country, device and browser before the visitor is sent on their way.

When shortening makes sense

• Social media and messaging: character limits and clean aesthetics reward short links.
• Print and QR codes: shorter URLs encode into simpler, more reliable QR codes.
• Campaign tracking: one short link per channel tells you exactly where clicks come from.
• Memorable links: a custom alias like /summer-sale beats a 200-character URL on a slide deck.

When it doesn't

Don't shorten links where trust in the visible destination matters more than brevity — for example, in a legal document or a high-stakes email, recipients may hesitate to click a link that hides where it goes. And never use a shortener to disguise a destination people would avoid if they saw it: that's exactly the behavior abuse policies exist to stop.

The bottom line

A good URL shortener is a tiny piece of infrastructure with an outsized impact on how your links look, share and perform. Create a free account and you'll see: paste a link, get a short one, watch the clicks roll in.

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Link Analytics: The Metrics That Actually Matter

Most people check one number — total clicks — and stop. That's like judging a restaurant by how many people walked through the door. The real insight is in who came, from where, and what they did next. Here's how to read link analytics like a marketer.

1. Total clicks vs. unique clicks

Total clicks count every open; unique clicks estimate distinct visitors (usually by hashing the visitor's IP for the day). A big gap between the two means a small group is clicking repeatedly — normal for a link you shared with your team, suspicious for a public campaign. Healthy campaigns have a unique-click ratio above 70%.

2. Click-through over time

A flat line means steady discovery (good for evergreen content). A spike means a single event drove traffic — find out which one and repeat it. A cliff means the link died somewhere: an expired campaign, a removed post, or a broken embed. Always compare against the same period before drawing conclusions.

3. Referrers: where clicks come from

The referrer tells you which page or app sent the visitor. This is the single most actionable metric: it shows which channels earn their keep. If your newsletter drives 10× the clicks of a paid ad at a tenth of the cost, your budget just told you where it wants to go.

4. Geography

Country data answers practical questions: Should this landing page be translated? Is that 3 a.m. traffic spike actually your Australian audience waking up? Are you getting clicks from markets you don't serve (a hint to check for bot traffic or a misconfigured ad target)?

5. Devices, browsers and operating systems

If 80% of clicks come from mobile, your destination page had better be flawless on a phone. Device splits also validate campaign context — a B2B whitepaper link should skew desktop; a restaurant menu QR code should be nearly all mobile.

Putting it together: a 5-minute weekly review

1. Sort links by clicks this week. Note the top 3 and bottom 3.
2. For each top link, check the top referrer — double down on that channel.
3. For each bottom link, check whether it got impressions but no clicks (a messaging problem) or no impressions at all (a distribution problem).
4. Glance at device split for anything you recently redesigned.
5. Export the CSV once a month and archive it — trends only emerge with history.

A note on privacy

Good analytics doesn't require surveillance. SwiftLink stores visitor IPs only as salted hashes — enough to count unique visitors accurately, never enough to identify anyone. You get the insight; your visitors keep their privacy.

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QR Codes Done Right: From Screen to Print

QR codes look simple — a square of black modules — but the difference between one that scans instantly and one that frustrates people comes down to a handful of physical details. Get these right and your codes work everywhere from phone screens to billboards.

1. Keep the encoded data short

QR complexity grows with data length. A 12-character short URL encodes into a sparse, forgiving code; a 200-character URL with tracking parameters becomes a dense grid that's harder to scan at distance or in poor light. This is the single best reason to put a URL shortener in front of your QR codes.

2. Size matters — the 10:1 rule

A practical rule of thumb: the code should be at least one-tenth the expected scanning distance. A code scanned from 30 cm (a flyer in hand) needs to be at least 3 cm across; a poster scanned from 3 meters needs 30 cm. When in doubt, go bigger — nobody ever complained a QR code was too easy to scan.

3. Contrast is non-negotiable

Scanners read dark modules on a light background. Black on white is the safest choice. If you brand your colors, keep the foreground dark, the background light, and test on several phones before printing. Never invert (light on dark) unless you've verified it scans on both iOS and Android cameras.

4. Quiet zone: give it breathing room

The blank margin around a QR code — the "quiet zone" — should be at least 4 modules wide on all sides. Crowding text or design elements against the code is the most common reason print QR codes fail. SwiftLink's QR downloads include a proper quiet zone automatically.

5. Error correction: your safety net

QR codes include built-in error correction (levels L, M, Q, H) that lets them scan even when partially obscured or damaged. Level M (about 15% recoverable) is the sweet spot for most uses; choose H if the code will be small, on curved surfaces, or partially covered by a logo.

6. PNG vs SVG: pick the right format

• SVG for print — it's vector, so it scales to any size without blurring. Use it for flyers, packaging, signage.
• PNG for screens — use a high-resolution export (at least 1024 px) for slides, websites and social posts.

7. Always test before you print

Scan the final artwork — not a screen preview of it — with at least two different phones, in the lighting where it will actually be used. Print a test copy at final size first; a code that scans beautifully on your monitor can fail miserably on glossy paper under spotlights.

The bottom line

Short URL in, reliable QR code out. Every link you create with SwiftLink can render a print-ready QR code in seconds — download the SVG, drop it into your design, and test it once. Done.

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