Svelte Quickstart

@upupjs/svelte is a native Svelte 5 port of the canonical upup React UI — DOM-identical to it — with cloud-drive sources, resumable uploads, theming, and ICU i18n. This page gets you uploading in client mode, no server package required.

Requires Svelte 5 (svelte is a peer dependency).

Install

npm i @upupjs/svelte

Minimal example (client mode)

In client mode the browser uploads directly to your storage; your app only issues short-lived upload credentials at uploadEndpoint.

<script lang="ts">
    import { UpupUploader } from '@upupjs/svelte'
    import '@upupjs/svelte/styles'
</script>

<UpupUploader provider="aws" uploadEndpoint="/api/upload-token" />

The stylesheet is a separate import, so projects without Tailwind get the same look. uploadEndpoint is your route that returns a presigned upload URL per file; provider is your storage backend — aws, minio, r2, digitalocean, wasabi, backblaze, and other S3-compatible providers work.

See Code Examples for a ready-to-copy presign handler.

Choose sources and cloud drives

Pass sources to pick which tabs appear and cloudDrives to enable the cloud providers (client IDs come from each provider's developer console):

<UpupUploader
    provider="aws"
    uploadEndpoint="/api/upload-token"
    sources={['local', 'camera', 'screen', 'url', 'googleDrive', 'oneDrive']}
    cloudDrives={{
        googleDrive: { clientId: '...', apiKey: '...', appId: '...' },
        oneDrive: { clientId: '...' },
    }}
/>

Add server mode

For credential isolation and server-proxied cloud drives, add @upupjs/server and point the uploader at it:

<UpupUploader mode="server" serverUrl="/api/upup" provider="aws" />

The handler requires an uploadTokenSecret of at least 16 characters — createUpupHandler throws at construction time if it is missing or too short:

import { createUpupHandler } from '@upupjs/server'

export const handler = createUpupHandler({
    storage: {
        type: 'aws',
        bucket: process.env.S3_BUCKET!,
        region: process.env.S3_REGION!,
    },
    uploadTokenSecret: process.env.UPUP_UPLOAD_TOKEN_SECRET, // required, >= 16 chars
})

See Server Mode — Setup for the full walkthrough: adapters for Next.js, Express, Fastify, and Hono; auth and user binding; and production token stores.

What you get

• Cloud drives — Google Drive, OneDrive, Dropbox, and Box, browsed in-panel.
• Camera and screen capture sources.
• Link import — add files by URL.
• Resumable uploads — optional tus or S3 multipart for large files.
• ICU i18n — locale bundles with pluralization and per-key overrides.
• Theming — design tokens, slots, and dark mode.

The image editor is React/Preact-only and is intentionally stubbed in Svelte; every other capability above is fully native.

Also exported

toReadable (adapts an uploader store to a Svelte readable), the use* uploader helpers, and the FileSource, StorageProvider, and UploadStatus enums for building a custom UI on the same engine.