supabase/apps/docs/content/guides/storage/uploads/standard-uploads.mdx

---
id: 'standard-uploads'
title: 'Standard Uploads'
description: 'Learn how to upload files to Supabase Storage.'
subtitle: 'Learn how to upload files to Supabase Storage.'
sidebar_label: 'Uploads'
---

## Uploading

The standard file upload method is ideal for small files that are not larger than 6MB.

It uses the traditional `multipart/form-data` format and is simple to implement using the supabase-js SDK. Here's an example of how to upload a file using the standard upload method:

<Admonition type="note">

Though you can upload up to 5GB files using the standard upload method, we recommend using [TUS Resumable Upload](/docs/guides/storage/uploads/resumable-uploads) for uploading files greater than 6MB in size for better reliability.

</Admonition>

<Tabs
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  size="small"
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  defaultActiveId="js"
  queryGroup="language"
>
<TabPanel id="js" label="JavaScript">

```javascript
import { createClient } from '@supabase/supabase-js'

// Create Supabase client
const supabase = createClient('your_project_url', 'your_supabase_api_key')

// Upload file using standard upload
async function uploadFile(file) {
  const { data, error } = await supabase.storage.from('bucket_name').upload('file_path', file)
  if (error) {
    // Handle error
  } else {
    // Handle success
  }
}
```

</TabPanel>
<TabPanel id="dart" label="Dart">

```dart
// Upload file using standard upload
Future<void> uploadFile(File file) async {
  await supabase.storage.from('bucket_name').upload('file_path', file);
}
```

</TabPanel>
<TabPanel id="swift" label="Swift">

```swift
import Supabase

// Create Supabase client
let supabase = SupabaseClient(supabaseURL: URL(string: "your_project_url")!, supabaseKey: "your_supabase_api_key")

try await supabase.storage.from("bucket_name").upload(path: "file_path", file: file)
```

</TabPanel>
<TabPanel id="kotlin" label="Kotlin">

```kotlin
val supabase = createSupabaseClient(supabaseUrl, supabaseKey) {
    install(Storage)
}

suspend fun uploadData(bytes: ByteArray) {
    supabase.storage.from("bucket_name").upload("file_path", bytes)
}

//Or on JVM/Android: (This will stream the data from the file to supabase)
suspend fun uploadFile(file: File) {
    supabase.storage.from("bucket_name").upload("file_path", file)
}
```

</TabPanel>
</Tabs>

## Overwriting files

When uploading a file to a path that already exists, the default behavior is to return a `400 Asset Already Exists` error.
If you want to overwrite a file on a specific path you can set the `upsert` options to `true` or using the `x-upsert` header.

<Tabs
  scrollable
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  type="underlined"
  defaultActiveId="js"
  queryGroup="language"
>
<TabPanel id="js" label="JavaScript">

```javascript
// Create Supabase client
const supabase = createClient('your_project_url', 'your_supabase_api_key')

await supabase.storage.from('bucket_name').upload('file_path', file, {
  upsert: true,
})
```

</TabPanel>
<TabPanel id="dart" label="Dart">

```dart
await supabase.storage.from('bucket_name').upload(
      'file_path',
      file,
      fileOptions: const FileOptions(upsert: true),
    );
```

</TabPanel>
<TabPanel id="swift" label="Swift">

```swift
import Supabase

// Create Supabase client
let supabase = SupabaseClient(supabaseURL: URL(string: "your_project_url")!, supabaseKey: "your_supabase_api_key")

try await supabase.storage.from("bucket_name")
  .upload(
    path: "file_path",
    file: file,
    options: FileOptions(
      upsert: true
    )
  )
```

</TabPanel>
</Tabs>

We do advise against overwriting files when possible, as our Content Delivery Network will take sometime to propagate the changes to all the edge nodes leading to stale content.
Uploading a file to a new path is the recommended way to avoid propagation delays and stale content.

## Content type

By default, Storage will assume the content type of an asset from the file extension. If you want to specify the content type for your asset simply pass the `contentType` option during upload.

<Tabs
  scrollable
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  type="underlined"
  defaultActiveId="js"
  queryGroup="language"
>
<TabPanel id="js" label="JavaScript">

```javascript
// Create Supabase client
const supabase = createClient('your_project_url', 'your_supabase_api_key')

await supabase.storage.from('bucket_name').upload('file_path', file, {
  contentType: 'image/jpeg',
})
```

</TabPanel>
<TabPanel id="dart" label="Dart">

```dart
await supabase.storage.from('bucket_name').upload(
      'file_path',
      file,
      fileOptions: const FileOptions(contentType: 'image/jpeg'),
    );
```

</TabPanel>
<TabPanel id="swift" label="Swift">

```swift
import Supabase

// Create Supabase client
let supabase = SupabaseClient(supabaseURL: URL(string: "your_project_url")!, supabaseKey: "your_supabase_api_key")

try await supabase.storage.from("bucket_name")
  .upload(
    path: "file_path",
    file: file,
    options: FileOptions(
      contentType: "image/jpeg"
    )
  )
```

</TabPanel>
</Tabs>

## Concurrency

When two or more clients upload a file to the same path, the first client to complete the upload will succeed and the other clients will receive a `400 Asset Already Exists` error.
If you provide the `x-upsert` header the last client to complete the upload will succeed instead.