> ## Documentation Index
> Fetch the complete documentation index at: https://filecheck.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Supported file types

> The file categories Filecheck can accept, check, fix, and convert.

Which file types your store actually accepts is up to you — you choose them per [Upload Rule](/docs/configuration/upload-rules) in the admin, along with size limits and what happens when a check fails. The categories below are what Filecheck supports, and what it can do with each.

<Tip>
  Files are identified by their actual content, not just their file extension. A `.pdf` that isn't really a PDF is caught at upload.
</Tip>

## PDF

Full preflight checks and automatic fixing.

| Extension | MIME type         | What Filecheck can do                                                           |
| --------- | ----------------- | ------------------------------------------------------------------------------- |
| `.pdf`    | `application/pdf` | Preflight checks, auto-fix, conformance validation, soft-proofing, optimization |

PDFs can also be validated against official ISO conformance standards: **PDF/A**-1a, -1b, -2a, -2b, -2u, -3a, -3b, -3u, -4, -4e, -4f (archiving) and **PDF/UA**-1, -2 (accessibility).

## Raster images

Full preflight checks and automatic fixing, using raster-specific checks (resolution, dimensions, color).

| Extension       | MIME type    | What Filecheck can do                                   |
| --------------- | ------------ | ------------------------------------------------------- |
| `.jpg`, `.jpeg` | `image/jpeg` | Preflight checks, auto-fix, soft-proofing, optimization |
| `.png`          | `image/png`  | Preflight checks, auto-fix, soft-proofing, optimization |
| `.tif`, `.tiff` | `image/tiff` | Preflight checks, auto-fix, soft-proofing, optimization |
| `.webp`         | `image/webp` | Preflight checks, auto-fix, soft-proofing, optimization |
| `.heic`         | `image/heic` | Preflight checks, auto-fix, soft-proofing, optimization |
| `.heif`         | `image/heif` | Preflight checks, auto-fix, soft-proofing, optimization |

## Vector

Accepted and converted to PDF, after which the full PDF toolset applies.

| Extension     | MIME type                | What Filecheck can do               |
| ------------- | ------------------------ | ----------------------------------- |
| `.svg`        | `image/svg+xml`          | Convert to PDF, then process as PDF |
| `.eps`, `.ps` | `application/postscript` | Convert to PDF, then process as PDF |

## Office documents

Accepted and converted to PDF, after which the full PDF toolset applies.

| Extension | MIME type                                                                 | What Filecheck can do               |
| --------- | ------------------------------------------------------------------------- | ----------------------------------- |
| `.doc`    | `application/msword`                                                      | Convert to PDF, then process as PDF |
| `.docx`   | `application/vnd.openxmlformats-officedocument.wordprocessingml.document` | Convert to PDF, then process as PDF |
| `.xls`    | `application/vnd.ms-excel`                                                | Convert to PDF, then process as PDF |
| `.xlsx`   | `application/vnd.openxmlformats-officedocument.spreadsheetml.sheet`       | Convert to PDF, then process as PDF |

## Archives

Accepted and passed through to your order or storage — no checks run on the contents.

| Extension | MIME type           | What Filecheck can do |
| --------- | ------------------- | --------------------- |
| `.zip`    | `application/zip`   | Accept and hand off   |
| `.tar`    | `application/x-tar` | Accept and hand off   |
| `.gz`     | `application/gzip`  | Accept and hand off   |

## Everything else

By default, a Rule rejects file types it doesn't list. You can instead choose to accept unknown types and hand them off unchecked — useful for reference material or supporting assets.

## Size limits

There is no fixed platform limit — you set a maximum size per accepted file type (and an optional total per upload) on each Upload Rule, and uploads are checked against it before processing. Files up to **500 MB** are supported.