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Read story → v3.0 live — zero-knowledge • end-to-end encrypted • SOC2
SHARE
ONLY ONCE.
VANISH FOREVER.
once.io is the burn-after-reading internet. Passwords, files, API keys, love letters — create a link that self-destructs after one view. No inbox clutter. No leaks. No second chances.
ONCE.IO/APP
🔒 prod-db-password.txt
once.io/x7Q9-burn-onceCOPY
👁 1 view remaining⏳ expires in 04:59
🔥 VIEWED → BURNED → GONE
AES-256Zero-knowledgeNo signupAPI + CLI
0links burned
0% leak-free rate
Built for developers • lawyers • founders • journalists • humans
FintechDevOpsHealthcareLegalCryptoJournalismHR & HiringGaming
Features — why once
BUILT TO DISAPPEAR BEAUTIFULLY
Everything you share should have an expiry date. once.io gives every secret a fuse — one view, one hour, one day — then cryptographically shredded.
01 / SECRETS
One-time secrets
Paste passwords, tokens, seed phrases, API keys. Get a link that dies after opening. No forward, no screenshot rescue — just gone.
02 / FILES
Burning files up to 5GB
Contracts, scans, videos, dumps. Client-side encrypted before upload. Download once, server wipes instantly with proof log.
03 / API
API + CLI for teams
Generate ephemeral links from CI/CD, Slack, Terraform. POST /v1/burn and rotate credentials without Slack leaks.
04 / VAULT
🔐 Passphrase armor
Add a second factor: recipient must know a passphrase. Brute-force protection + anti-bot view counting.
05 / PROOF
🧾 Burn receipts
Cryptographic receipt: who viewed, when, from where — without storing content. Perfect for audits and legal handoffs.
06 / CUSTOM
⚡ Custom domains
Share via go.yourcompany.link with your logo, expiry policy, SSO and DLP rules. White-label trust.
About — our manifesto
THE INTERNET NEVER FORGETS. WE DO.
once.io was born in 2019 from a simple rage: screenshots of passwords in Slack, eternal Gmail attachments, “temporary” Drive links that live for 7 years. We asked — what if sharing defaulted to forgetting?
We are a remote-first crew of cryptographers, designers and ex-journalists across Lisbon, Berlin and Kyoto. We believe privacy isn’t a feature, it’s a default. Every line of once.io is built so that even we cannot read your data. Zero-knowledge, open crypto, minimal metadata, EU hosting, instant purge.
2019founded, bootstrapped
27 peopleno trackers, no ads
2019 →First burn-link. 10k secrets in week one. Hacker News frontpage.
2022 →Zero-knowledge rewrite. Client-side AES-GCM, audited by Cure53-style review.
2025 →4.8M burns, SOC 2 Type II, EU AI Act ready. Launch of once Enterprise Vault.
4.8M+secrets burned and counting.
Zero breaches. Zero recoveries. By design.
Zero breaches. Zero recoveries. By design.
How it works
PASTE. LINK. POOF.
No account needed for basics. Three steps, eleven seconds, zero footprint.
Step 1
✍️ Drop your secret
Type text, upload file, or pipe via CLI. Encrypted in your browser before it leaves.
Step 2
🔗 Get once-link
Set views = 1, timer, passphrase. Copy once.io/… link to share anywhere.
Step 3
👁 One view
Recipient opens once. Content decrypts locally. Countdown starts.
Step 4
🔥 Burned
Keys shredded, blocks overwritten, receipt issued. Even we can’t restore.
For humans: no signup sharing
Send Wi-Fi passwords to Airbnb guests, medical docs to clinics, private photos that can’t be re-shared. Works on any phone, no app.
For machines: ephemeral DevOps
$ npm i -g once-cli
$ once burn .env --views 1 --ttl 1h
→ https://once.io/a8f3… # burned after CI pull
Use cases
WHO BURNS WITH ONCE?
Security — trust nothing
ZERO-KNOWLEDGE OR IT DIDN’T HAPPEN
We can’t sell, leak or subpoena what we never had. Encryption happens on your device. Servers see only opaque blobs.
🛡️ AES-256-GCM + X25519
Modern, audited primitives. Keys live in URL fragment (#) never sent to server.
🧬 Perfect forward burn
Each link = unique key. Memory zeroed, SSD blocks crypto-shredded, backups excluded by design.
📜 Compliance without creep
SOC 2 Type II, GDPR, HIPAA-ready flows, EU residency, DPA + burn receipts for auditors.
Pricing
PAY FOR FORGETTING
Free forever for one-offs. Pro for power burners. Enterprise for regulated amnesia.
Spark — Free
$0For quick burns
- 10 burns / month
- Files up to 100MB
- 1 view + 24h expiry
- No account needed
🔥 Burner — Pro
$8/moFor teams & freelancers
- Unlimited burns
- Files up to 5GB
- Passphrase + custom TTL
- Custom domain + receipts
- API + Slack + CLI
Vault — Enterprise
CustomFor banks, clinics, gov
- SSO / SCIM, audit log
- EU / US residency
- DLP + retention policies
- 99.99% SLA, dedicated HSM
Wall of love
4.9 ★ FROM PARANOIDS
★★★★★
“We killed passwords-in-Slack in one day. once-cli is now in every pipeline. Burn receipts saved our SOC2 audit.”
Maya K. — DevOps LeadFintech, 200 people
★★★★★
“I send client contracts via once.io. They feel VIP, I feel safe. The self-destruct animation? Chef’s kiss.”
Jonas R. — AttorneyBerlin law boutique
★★★★★
“Sources trust me more when I send a link that literally cannot be forwarded. Essential for investigative work.”
Amara O. — JournalistIndependent reporter
FAQ
QUESTIONS? BURN THEM.
Short answers. Long privacy.
No. Keys are in the URL hash we never receive. After burn, decryption is mathematically impossible — even for us.
TTL expires it automatically. You get a “expired unviewed” receipt and can re-issue in one click.
Content: never in plaintext. Metadata: minimal, 24h rolling logs, EU-only. No trackers, no ad pixels.
Yes. 10 burns/month, no card. We make money on Pro teams, not your data.
No tech can fully block OS screenshots, but we add view-once blur, watermarking, and forward-blocking to raise the bar.
Journal — fresh burns
LATEST DROPS
Product notes, encryption guides, privacy essays. Each story lives forever — unlike your secrets.
● READY TO FORGET?
CREATE YOUR FIRST BURN-LINK IN 11 SECONDS
No signup. No trace. Just paste, share, vanish. Join 40,000+ teams who stopped leaking in chat.
Free 10 burns/mo • AES-256 • EU hosting • Cancel anytime (we’ll forget you)