Checker
Redbubble resolution checker
All four of Redbubble's hard numbers, checked at once. The file stays in your browser.
Batch, auto-fix and exports
Everything above is free for one file at a time, and always will be. Doing it to a whole folder — batch checking up to 100 files, one zip with every platform file for every design, and a CSV report — is part of Seller.
Exports are padded and centred to each platform's size on a transparent canvas. Nothing is ever upscaled — a file enlarged to pass a dimension check still prints soft, which is the failure this tool exists to prevent.
Redbubble: the numbers that matter
| Dimensions | set per product |
|---|---|
| Graphic T-Shirt | 3873 × 4814 px |
| Premium T-Shirt | 2875 × 3900 px |
| Platform-wide long-edge rule | none |
| Platform-wide DPI threshold | none published |
| Authoritative source | the Dimensions & Format page |
How this tool calculates DPI
It ignores the DPI tag written into the file and divides the pixel count by the 12.91″ × 16.05″ print area instead — which is the figure the platform actually enforces.
Frequently asked questions
What DPI does Redbubble require?
Prepare at null DPI across the print area. Redbubble is permissive about low-resolution uploads, so the risk sits in the finished product rather than at the upload step.
Do I need an account to check a file?
No. The whole check runs in your browser — no account, no upload.