> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.booko.nl/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Upload purchase invoices and receipts

Upload your cost invoices and receipts to Booko. The AI reads them and proposes a booking. You or your accountant then check the result.

## Steps

1. Click **Upload invoice** on the **Overview** or on the **Costs** page.
2. Drag your files onto **Drop invoices here**, or click **Select files**. You can pick several files at once.
3. Each file shows its progress: **Uploading…**, **Queued**, **Classifying…** and then **Auto-classified** or **Needs check**.
4. Done? Close the window. Your invoices are listed under **Costs**.

## Which files?

- PDF or images (such as JPG, PNG, WEBP, HEIC, BMP and TIFF).
- Up to **10 MB per file**.
- One invoice per file works best.

## Good to know

- Uploading the same file twice shows **Already uploaded**; it isn't added again.
- Prefer email? In the upload window, expand **Send invoices by email** (see "Email invoices to Booko").
- No file? On **Costs** you can enter a cost yourself with **Add manually**.

## Still stuck?

- A file shows **Failed**? Click **Retry all** to retry the failed files.
- **This file is larger than 10 MB.** Make the file smaller or save it as a PDF.
- **The file contents are not a supported PDF or image.** or **The file extension or type does not match its contents.** Export the document again as a PDF.
- **This file is empty.** Choose the original file.
- Still not working? See "Upload failed" or ask for a colleague in the chat.