Download 10 MB WebP file for testing
Preview the WebP and test your accepted-image rules. The preset is 10 MiB (10,485,760 bytes); choose MB for decimal megabytes.
1 MB = 1,000,000 B · 1 MiB = 1,048,576 B
Advanced: test an upload limit
Enter the byte limit above, then choose one byte below, the exact limit or one byte above. Each choice uses the same base: 10,485,760 B. Generate and download each file to test your endpoint.
What to test with this WEBP fixture
- Decode the WebP image and inspect its RIFF container. Re-encoding can remove padding, so compare the original download when testing an exact size.
- Checking that upload forms which only list JPG and PNG handle WebP correctly.
- Testing CDN image transformation with a heavy WebP source.
- Sharing a test image on Discord's free tier.
Limits it lands on
- Discord's free upload limit is 10 MB, so this file sits on the boundary.
- WebP itself limits images to 16383 × 16383 pixels; this file is 800 × 600, so only its byte size is unusual.
What is inside the file
The browser encodes the picture as WebP, then a custom RIFF chunk absorbs the remaining bytes; the RIFF size field is corrected so the container stays valid.
Chrome, Edge, Firefox and Safari display it; libwebp tools such as dwebp decode it too.
Questions
Is a WebP of this size realistic?
Rarely — WebP is usually small. That makes it useful for checking that size limits apply to every format, not just JPG.
Will converting to JPG keep the size?
No. Conversion drops the custom chunk, so the result is a small JPG.
Does 10 MB on this page mean 10000000 bytes?
This legacy URL selects 10 MiB: 10,485,760 bytes. A decimal 10 MB cap is 10,000,000 bytes. Select decimal MB or enter exact bytes on the WEBP format page.
Reference and checks
Format reference: WebP RIFF container.
Preset target: 10 MiB (10,485,760 bytes). Verify the downloaded file's byte count.
Generate another size in this format · Technical notes for every format · Guide to testing file upload limits · Data processing and privacy
Related tools: Image Convert · Resize Image · Compress Image.
Noticed an issue with this test file? Report an issue →