# DROP facts, sources and evidence boundaries

> A dated fact register distinguishing DROP implementation evidence, vendor documentation and pending global availability and speed studies.

Canonical page: https://drop.space/en/evidence/
Content updated: 2026-10-29
Publisher: DROP

We distinguish implementation review, vendor documentation and measured product results. An implementation review describes the code; it is not an independent audit, uptime guarantee or worldwide performance study.

## Implementation fact register

Evidence class: first-party implementation review. Not an independent certification.

### Up to 3 GB per transfer (3,000,000,000 bytes total).

Implementation reference: worker/storage.ts: MAX_BYTES; worker/index.ts: POST /api/transfers

### Between 1 and 1,000 files per transfer; folder paths are preserved.

Implementation reference: worker/index.ts: transfer creation; worker/storage.ts: safePath; worker/zip.ts

### Send and download a link without a DROP account.

Implementation reference: worker/index.ts: creation, public listing and download routes

### Anonymous links expire 24 hours after creation. Verified Google sign-in can extend owned uploads to 72 hours after creation, when configured and before expiry.

Implementation reference: worker/index.ts: creation, Google callback and TransferCoordinator.extend; worker/storage.ts: active

### Download files individually or together as a streamed ZIP archive.

Implementation reference: worker/index.ts: download/archive; worker/zip.ts

### Preview supported images, PDF, video, audio and text. Office previews require the converter and accept originals up to 64 MiB.

Implementation reference: src/components/FileCardContent.tsx; src/components/DocumentPreview.tsx; worker/index.ts: serveFile

### Anyone holding a valid link can download. Access stops at expiry; storage cleanup follows asynchronously and retries failures.

Implementation reference: worker/storage.ts: active, purge; worker/index.ts: alarms and scheduled cleanup

### Built with Cloudflare Workers, private R2 storage and D1.

Implementation reference: wrangler.jsonc; worker/index.ts

## How product facts are supported

The register below identifies implementation locations for each claim. The repository’s integration checks exercise local R2, D1, multipart transfers, expiry guards and archive integrity. A local check only establishes the tested local behavior. Production deployment and individual service configuration still matter.

## What has not been established

There is no published independent cross-provider speed test, country-by-country transfer matrix, universal availability guarantee, end-to-end encryption certification or quantified uptime record here. We do not invent rankings, customer quotes, test results or AI citation guarantees.

## Corrections and maintenance

Comparisons link to the vendor that owns each fact and carry a review date. Recheck vendor plans before using them, after a plan change and during editorial review. The evidence status should change only when the underlying measurement or implementation changes.