OneTimeSecret vs ProtonURL:
Which Is More Secure?
Both services offer one-time secret sharing. But ProtonURL goes further with end-to-end encryption, file attachments, REST API, and cryptographically verifiable deletion proofs.
Try ProtonURL free| Feature | OneTimeSecret | ProtonURL |
|---|---|---|
| End-to-end encryption | ||
| One-time read | ||
| No account required | ||
| File attachments | Up to 10MB | |
| REST API access | Limited | Full API on paid plans |
| Optional passphrase | ||
| Verifiable deletion proof | ECDSA P-256 | |
| Free plan | Unlimited links | Unlimited links + web UI |
| Paid plan starts at | $0.99/mo | $4.99/mo (API Starter) |
What ProtonURL adds beyond OneTimeSecret
File Attachments
Share encrypted files up to 10MB (30MB on Business). OneTimeSecret does not support file attachments — ProtonURL handles sensitive documents, credentials files, and more.
REST API
Programmatically create and manage encrypted links via REST API. Integrate into your workflows, automation tools, and developer pipelines. Available on all paid plans.
Deletion Proofs
Every burned link generates a cryptographically signed ECDSA deletion proof. Anyone can verify the content was permanently destroyed — not just deleted from the server.
Security comparison
OneTimeSecret
- One-time link deletion after read
- Server-side encryption
- No publicly verifiable deletion proof
- No file attachment support
- No official API access
ProtonURL
- One-time link deletion after read
- End-to-end encryption — server never sees plaintext
- ECDSA P-256 deletion proofs — publicly verifiable
- Encrypted file attachments up to 10MB/30MB
- Full REST API on all paid plans
Frequently asked questions
Try the more secure OneTimeSecret alternative
End-to-end encryption, file attachments, REST API, and verifiable deletion proofs.