The Short Answer
For most international travelers, the IDP is the right choice. It's standardized, issued under UN treaty law, and accepted in 150+ countries simultaneously. A certified translation covers only one target language and is harder to obtain before travel.
Side-by-Side Comparison
| Feature | IDP | Certified Translation |
|---|---|---|
| Countries covered | 150+ | 1 target language country |
| Languages | 10 simultaneously | 1 target language |
| Obtainable abroad? | No — home country only | Sometimes locally |
| Required in Italy/Japan/Poland? | Yes | No — IDP format specifically required |
| Accepted in France/Germany? | Yes | Yes (as alternative) |
| Standardized UN format | Yes | No — varies by translator |
| Price | $29–$69 | Often $50–$200+ |
When Each Makes Sense
You're visiting multiple countries, your destination requires the IDP booklet format specifically (Italy, Japan, Poland, Greece), or you want one document valid anywhere for 1–3 years.
You're already abroad without an IDP and need something urgently, or you need a specific local language not covered by the IDP's 10 languages.
The IDP Covers Almost Every Situation
One document, 10 languages, 150+ countries. Digital from $29.
Yes — IDP and IDL are used interchangeably. They refer to the same UN-standardized translation document.
Italian law specifically references the IDP format. A generic certified translation may not satisfy Italian requirements.