Acortamiento de URL de QR Code: Cuándo y Cómo
Shortening URLs for smaller QR codes: services, custom domains, permanence concerns, and when to avoid shorteners.
QR Code URL Shortening: When and How
Shorter URLs create smaller, simpler QR codes. But URL shorteners introduce dependencies and trust concerns that must be weighed against the size benefit.
Why Shorten?
URL length directly affects QR code version and physical size:
| URL Length | Approximate Version (EC-M) | Module Count |
|---|---|---|
| 25 chars | Version 2 | 25x25 |
| 50 chars | Version 4 | 33x33 |
| 100 chars | Version 7 | 45x45 |
| 150 chars | Version 10 | 57x57 |
A URL with UTM parameters can easily reach 100-150 characters. Shortening to 25 characters saves 4-5 versions, significantly reducing physical size.
Shortening Options
Custom domain shortener (recommended): Use a short domain you own (e.g., go.brand.com/abc). Full control, no third-party dependency.
Branded shorteners: Services like Rebrandly or BL.INK with your custom domain. Managed service with analytics.
Generic shorteners: bit.ly, tinyurl.com, is.gd. Simple but third-party dependency and user trust concerns.
Permanence Concerns
URL shorteners create a dependency: if the shortener service shuts down, all QR codes become dead links.
Mitigation strategies: - Use a domain you own for short URLs - Choose established services with track records - Maintain a mapping database (short URL → full URL) for migration - Consider dynamic QR codes instead of shorteners (the short URL is built into the dynamic QR service)
The Alphanumeric Trick
Instead of shortening, you can reduce QR code size by using uppercase URLs:
HTTPS://EXAMPLE.COM/PAGE encodes in Alphanumeric mode (5.5 bits/char) instead of Byte mode (8 bits/char) — approximately 30% more efficient. However, some servers are case-sensitive, so verify that uppercase URLs resolve correctly.
Key Takeaways
- Shorter URLs reduce QR code version by 3-5 levels
- Custom domain shorteners provide control and permanence
- Generic shorteners introduce third-party dependency risk
- Uppercase URLs trigger Alphanumeric encoding for ~30% size reduction
- Dynamic QR codes achieve the same size benefit without separate shorteners