Best fit
A cover can look good in an editor but crop poorly, reuse the same composition for the square slot, contain accidental transparency, or arrive below a useful source size.
// Digital Products
Gumroad Image Preflight
Inspect a real Gumroad cover and thumbnail pair, render safe-zone previews, and get PASS, REVIEW, or REWORK findings before upload.
What problem does Gumroad Image Preflight solve?
A cover can look good in an editor but crop poorly, reuse the same composition for the square slot, contain accidental transparency, or arrive below a useful source size.
Use it to
- Check a Gumroad cover before upload
- Verify a separate square thumbnail composition
- Catch undersized or oddly shaped files
- Review transparency and web color-mode risks
What it returns
- File-fact report for both images
- PASS, REVIEW, or REWORK gate
- Cover safe-zone preview
- Square-thumbnail safe-zone preview
A representative input and result
input A 1280x720 RGB cover and a separately composed 800x800 RGB thumbnail.
result Gate: PASS. Both files are readable web formats, meet the review baselines, use separate compositions, and have generated safe-zone previews ready for visual review.
Access and approval boundaries
- Read access only to the user-supplied local input files.
- Write access only to the selected local output directory.
- No browser, network, credential, account, or environment-variable access is required.
Known limitations
- The baselines are review controls, not a guarantee that Gumroad will accept or crop files unchanged.
- Visual quality, subject placement, and brand suitability remain human decisions.
- Pillow must be available locally to inspect and render the files.
// choose with context
Is Gumroad Image Preflight the right skill?
It returns
File-fact report for both images. PASS, REVIEW, or REWORK gate.
Do not use it as
The baselines are review controls, not a guarantee that Gumroad will accept or crop files unchanged.
Compatibility, access, version, and licence
- Reads or accesses
- Declared local scope: cover.png|jpg|webp, thumbnail.png|jpg|webp, image-preflight/**.
- Compatibility
- PNG, JPEG, and WebP input Python 3.9 or newer with Pillow Local files only; no Gumroad account required
- Version
- 1.0.0
- Licence
- Review the package licence and seller terms at the linked destination.
Questions
Does it upload images?
No. It performs local preflight only.
Which formats are supported?
PNG, JPEG, and WebP are tested.
Why require a separate thumbnail?
A square slot needs a deliberate composition rather than an automatic crop of a landscape cover.
Does PASS guarantee acceptance?
No. Platform processing and visual judgment remain outside the automated check.
What previews are generated?
A landscape cover preview and a square thumbnail preview, each with an inset safe-zone overlay.
What is the paid next step?
Product Image Creator makes new options, while Gumroad Image Uploader handles the reviewed upload workflow.
Gumroad Image Preflight keeps proof and approval boundaries visible.
The listing includes the tested package, realistic samples, declared permissions, and known limitations.
Get Gumroad Image Preflight on Agensi