Two separate tools. Resize the pixels to a KDP trim size with bleed, or set the DPI tag to 300 without touching a single pixel. Free, in your browser, nothing uploaded.
Drop images to resize
JPG & PNG · batch supported
KDP trim sizes at 300 DPI
Or set it manually
KDP does not have one set of image rules — it has three, and they differ on colour space, file type and size limit. Check the column that matches what you are uploading.
| Item | eBook cover | Paperback cover | Interior |
|---|---|---|---|
| File you upload | JPEG or TIFF | One PDF | PDF, DOC, DOCX, RTF, HTML, TXT |
| Colour space | RGB | CMYK recommended | Follows the manuscript |
| Maximum file size | Under 50 MB | 650 MB (40 MB or less advised) | 650 MB |
| Resolution | 2,560 × 1,600 px ideal | 300 DPI at printed size | 300 DPI at printed size |
| Bleed | Not applicable | 0.125" (3.2 mm) per bleeding edge | 0.125" (3.2 mm) per bleeding edge |
The two size limits are often confused. 50 MB is the Kindle eBook cover limit; 650 MB is the limit for print files — both the paperback cover PDF and the manuscript. They are not interchangeable.
This page does two things that are easy to confuse, so they are kept apart deliberately — separate tabs, separate drop zones, separate buttons.
| Resize pixels | Set DPI tag | |
|---|---|---|
| What it changes | Every pixel in the image | A few bytes of metadata |
| Pixel count after | Whatever you asked for | Identical to before |
| Quality | Re-encoded, so slightly lossy | Untouched, bit for bit |
| Use it when | Your image is the wrong size for the page | Your image has the pixels but places wrong |
The presets come straight from Amazon's trim size list and its bleed formula: page height with bleed is the trim height plus 0.125″ twice, page width is the trim width plus 0.125″ once, because the inner edge is bound and does not bleed.
| Trim size | Pixels at 300 DPI (no bleed) | With bleed |
|---|---|---|
| 5 × 8 in | 1500 × 2400 | 1538 × 2475 |
| 5.25 × 8 in | 1575 × 2400 | 1613 × 2475 |
| 5.5 × 8.5 in | 1650 × 2550 | 1688 × 2625 |
| 6 × 9 in | 1800 × 2700 | 1838 × 2775 |
| 7 × 10 in | 2100 × 3000 | 2138 × 3075 |
| 8.5 × 11 in | 2550 × 3300 | 2588 × 3375 |
Shrinking an image is safe: you are throwing away detail you had, and the result is genuinely sharp at the smaller size. Enlarging is the opposite. There is no extra detail anywhere in the file, so the new pixels are guessed by interpolating between the ones that existed. The picture gets bigger and softer at the same time.
That is why the resize tool refuses to proceed on an enlargement until you tick a box confirming you understand it. It is not there to be annoying — it is there because a 900-pixel-wide photo blown up to 1838 px will pass KDP's automated check and still look disappointing in print.
This tool rewrites the DPI tag stored inside your image. That tag does not decide whether KDP accepts your file — KDP works out resolution by dividing your pixel count by the printed size. What the tag does decide is the physical size programs like Word, InDesign and Affinity give the image when you place it.
An image tagged 72 DPI drops into a manuscript roughly four times larger than intended, and that oversized placement is what drags the effective resolution below 300. Correcting the tag to 300 makes the image land at its true size, which resolves that whole class of problem.
For an image printed across the full 6 inches of a 6×9 page you need 6 × 300 = 1,800 px wide; a full-page image needs 9 × 300 = 2,700 px tall. Add bleed and the page grows to 6.125 × 9.25 inches, so a full-bleed image needs 1,838 × 2,775 px. Check your dimensions in Windows (right-click → Properties → Details) or on Mac (Preview → Tools → Inspector).
For the full breakdown of Amazon KDP image specs, read our guide: Amazon KDP Image Requirements 2026.
If your image already has the pixels but lands at the wrong size in Word or InDesign, use Set DPI tag: it edits metadata and changes no pixels. If the image is genuinely the wrong size for the page, use Resize pixels. The tabs keep the two apart so you always know which one is about to run.
Shrinking is safe and normally looks crisp at the smaller size. Enlarging is not: there is no hidden detail to recover, so the extra pixels are interpolated from the ones that already existed and the result looks softer than the original. The tool will not enlarge anything until you tick a box confirming you understand that.
Yes, by default. Amazon asks for 0.125 inches of bleed on the top, bottom and outside edges, which makes the page a quarter inch taller and an eighth of an inch wider than the trim size. You can switch bleed off if your artwork does not run to the edge of the page.
Most cameras and phones write 72 into the file by default, a leftover from a 1984 screen convention. It is not a measure of quality: a 24-megapixel photo tagged 72 DPI still holds all 24 megapixels.
Then the image genuinely lacks pixels for the size it is printed at. Multiply the printed width in inches by 300 to see what you need. You can enlarge it here, but that will not add detail, so the better fix is to place it smaller on the page or start from a higher-resolution original.
A full-width image on a 6-inch-wide page needs 6 by 300 = 1,800 pixels across, and a full-page image needs 9 by 300 = 2,700 pixels tall. Add bleed and you need 1,838 by 2,775 pixels.