Future Self Voice Capsule

Record a voice message to your future self. Set a date — the capsule stays locked until that day arrives. Completely private: your audio is stored in your browser and never sent to any server.

1. Record your message

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Click Record to start. You may be asked for microphone permission.
🔒 Everything stays on your device. No uploads, no accounts.

2. Your capsules

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No capsules yet. Record your first message above.

How it works

The entire process runs inside your browser — no server, no account, no cloud storage.

1. RecordUses the browser's built-in MediaRecorder API to capture your microphone. Audio never leaves your device.
2. SealYour message and unlock date are saved to IndexedDB — a private database stored entirely in your browser.
3. Date gateWhen you open a capsule, the current time is compared to your unlock date using new Date(). If today is before that date, playback is blocked.
4. Unlock & exportOn or after the unlock date the Play button activates. You can listen and optionally download the audio as a WebM file.

Your capsules live in browser storage. Clearing site data in your browser will erase them — use the Download button to keep a permanent copy after unlocking.

Frequently asked questions

Is my voice recording private?
Yes, completely. Your audio is stored using the browser's IndexedDB API — a local database on your device. No data is transmitted to any server. The page works entirely offline once loaded. Only you can access the files, and only through this browser on this device.
What happens if I clear my browser data?
Clearing your browser's site data, cookies, or storage will erase your capsules permanently. We recommend downloading your message using the Download button once it unlocks, and keeping that file somewhere safe (like a cloud drive or external storage) as a backup. Browser storage is convenient but not a permanent archive.
Can I cheat the date lock by changing my system clock?
Technically yes — the gate uses your device's clock. But the point of a voice capsule is the emotional experience of hearing your past self speak at exactly the right moment. Cheating the lock only robs you of that experience. The lock is a commitment device, not a security system.
How long can I record, and what format is the audio?
There is no hard limit enforced by this tool — recordings up to several hours are possible, though very long recordings will use more browser storage. Audio is saved in WebM format (the standard MediaRecorder output in most browsers). The Download button exports this as a .webm file, which plays in Chrome, Firefox, VLC, and most modern media players. On Safari, the format may be MP4/AAC instead.
What are some good uses for a voice capsule?
People use voice capsules to record a message to themselves on New Year's Eve to open next year, to send encouragement to their future self during a hard time, to document goals before starting a challenge and reflect on progress afterwards, to capture how they sound (and think) at a particular age, or to leave a memory for a milestone like a birthday, graduation, or anniversary.