Upload your EPUB file and a new cover image, combine them together in your browser, and download the result. Works on iPhone, Android, Kindle, Kobo, and every e-reader.
Drop your EPUB and a new cover image below. We will combine them for you.
WORKS EVERYWHERE
No matter which e-reader or phone you use, EPUB Cover Changer works directly in your browser — no extra software required.
Change EPUB covers directly in Safari or Chrome on your iPhone or iPad. Pick your EPUB from the Files app, choose a new cover from Photos (HEIC images from your camera roll work natively), and download the updated EPUB straight back to Files. Open it with Apple Books and your new cover appears immediately — no computer needed.
Works on all Android devices running Chrome, Firefox, Samsung Internet, or any modern browser. After changing your cover, open the downloaded EPUB in Moon+ Reader, Lithium, ReadEra, FBReader, or Google Play Books. The tool adapts file size limits to your device's memory, so even budget Android phones handle it smoothly.
Change your EPUB cover first, then send the updated file to your Kindle using Send to Kindle (via email or the app), or transfer via USB cable. Works with all Kindle models — Paperwhite, Oasis, Scribe, and the basic Kindle — plus the Kindle app on iOS, Android, and desktop.
Fully supports Kobo Kepub format (.kepub.epub). Change the cover, then drag and drop the file onto your Kobo device via USB, or sideload using Calibre. Kobo devices display cover thumbnails in the library grid — the new cover shows up immediately after reimporting. Compatible with Kobo Clara, Libra, Sage, Elipsa, and all models.
Use any desktop browser — Chrome, Edge, Firefox, or Safari. With more RAM available, the tool allows larger EPUB files (up to 500 MB) and higher-resolution cover images (up to 100 MB). Ideal for processing batches of books or working with large, image-heavy EPUB files that would strain a phone.
The tool outputs standard-compliant EPUB files that work on virtually any e-reader or reading app — Nook, PocketBook, Onyx Boox, Tolino, and more. As long as your device supports EPUB (EPUB2 or EPUB3), the changed cover will display correctly in your library and on the reading screen.
HOW IT WORKS
Drag and drop your EPUB or Kepub file into the left slot, and your new cover image into the right slot. You can also click either slot to browse files from your device. Supported ebook formats include .epub (EPUB2 and EPUB3) and .kepub.epub (Kobo Kepub). For cover images, we accept PNG, JPG, JPEG, WebP, GIF, BMP, TIFF, HEIC, and HEIF — so you can use photos straight from your iPhone camera roll without converting first. All files stay in your browser; nothing is uploaded to any server.
Once both files are loaded, the Change Cover button becomes active. Click it and the tool extracts your EPUB, identifies the existing cover image, replaces it with your new one, updates the internal manifest and metadata, and repackages everything back into a valid EPUB file. The entire process typically completes in under 30 seconds, depending on your file sizes and device speed. A preview of your updated book cover appears so you can verify the result before downloading.
Your updated EPUB is ready to download instantly with a single click. The file keeps its original filename (with the cover replaced inside), so it slots right back into your library without confusing your e-reader. No sign-up, no watermark, no usage limits. Transfer it to your Kindle via Send to Kindle or USB, open it in Apple Books on your iPhone, or load it onto your Kobo — the new cover displays perfectly across all e-readers and reading apps.
USE CASES
There are many reasons you might want to replace a book cover. Here are the most common scenarios where EPUB Cover Changer helps.
Many EPUB files come with generic, low-resolution, or missing covers — especially older books, public domain titles from Project Gutenberg, or DRM-free backups. Replace them with high-quality cover art that looks great in your e-reader library grid.
Have a series where each book has a mismatched cover style? Standardize them by applying a consistent cover design across all books in a series — same fonts, layout, and color scheme — for a clean, organized library appearance.
If you have a book in one language but want the cover from a different edition (e.g., the original language cover or a localized version), use this tool to swap covers without affecting the book's content or metadata.
Add custom covers to your own writing, fan fiction, or personal documents converted to EPUB. A custom cover makes your self-published content look professional and easier to identify in your reading app.
When converting books between formats (e.g., PDF to EPUB via Calibre or online converters), the cover image is often lost, distorted, or replaced with a generic placeholder. Use EPUB Cover Changer to restore the proper cover art after conversion.
Publishers often release updated cover designs for reissues or movie tie-in editions. Keep your digital library current by swapping old covers for the latest official artwork without needing to repurchase the book.
WHY CHOOSE
Unlike generic online converters, EPUB Cover Changer is built specifically for EPUB cover replacement with a focus on privacy, performance, and format fidelity.
Every file operation — ZIP extraction, image replacement, manifest updates, and repackaging — runs inside your browser using JavaScript and Web APIs. No server ever sees your EPUB or cover image. This is not just a privacy claim; it is an architectural guarantee verified by inspecting the browser's Network tab: zero upload requests.
EPUB Cover Changer replaces only the cover image and updates the OPF manifest and metadata accordingly. All other content — chapter files, CSS stylesheets, embedded fonts, navigation, and NCX/NAV documents — remains untouched. The tool handles EPUB2, EPUB3, and Kobo Kepub formats with proper MIME type detection and container.xml parsing.
The tool dynamically adjusts file size limits based on your device's memory (navigator.deviceMemory API) and CPU cores. Low-end phones get 50 MB EPUB / 10 MB image limits; high-end workstations handle up to 500 MB / 100 MB. This prevents browser crashes while maximizing capability on powerful hardware.
Accepts 9 image formats including HEIC (iPhone photos) and WebP. The cover image is automatically converted to the optimal format for EPUB compatibility. EPUB inputs support standard .epub, Kobo .kepub.epub, and any valid EPUB2/EPUB3 container — no pre-conversion needed.
EPUB Cover Changer is and always will be free to use. There are no premium tiers, no daily usage limits, no forced sign-ups, and no watermarks on your output files. You can change as many EPUB covers as you want, whenever you want, on any device. The tool is supported by non-intrusive advertising — no paywalls hiding features behind subscriptions.
Install EPUB Cover Changer to your device's home screen and it works like a native app — complete with offline support via Service Worker caching. Open it from your home screen, and the tool loads instantly even without an internet connection. Your files still process locally in the browser, exactly the same as online.
UNDER THE HOOD
Understanding the technical process helps you trust the tool and troubleshoot any issues. Here is exactly what happens when you click the Change Cover button.
The EPUB file is loaded into memory as an ArrayBuffer and parsed using JSZip. An EPUB is essentially a ZIP archive containing XHTML, CSS, images, and metadata files. The tool reads the META-INF/container.xml to locate the OPF package document, which is the manifest for the entire book.
The tool scans the OPF manifest for the cover image reference. In EPUB2, this is the item with id="cover-image" or referenced by the <meta name="cover"> element. In EPUB3, the properties="cover-image" attribute identifies the cover. Multiple detection strategies ensure compatibility with non-standard EPUBs.
Your new cover image is decoded, normalized to a standard format, and written into the EPUB archive at the correct path. The tool preserves the original image filename and directory structure to maintain manifest integrity. HEIC images are converted to JPEG or PNG since EPUB readers do not support HEIC natively.
The OPF manifest is updated to reflect the new cover image's MIME type and file size. If the EPUB includes a cover XHTML page, its <img> tag dimensions are updated. The EPUB metadata (<meta> and <dc:date>) receives a modification timestamp so e-readers recognize the updated file.
The modified archive is compressed back into a valid EPUB using JSZip's DEFLATE compression with the correct mimetype entry (stored uncompressed as required by the EPUB specification). The resulting Blob is offered as a download with the original filename or a new one if you choose to rename.
COVER IMAGE GUIDE
The quality of your cover image makes a big difference in how your library looks. Follow these guidelines for the best results across all e-readers.
The ideal EPUB cover size is 1600 x 2560 pixels — a 2:3.2 aspect ratio that matches the screen proportions of most e-readers including Kindle, Kobo, and Apple Books. This resolution ensures crisp display on high-DPI e-ink screens. The minimum safe size is 800 x 1280 pixels. Avoid images narrower than 600 pixels, as they will appear blurry or pixelated on modern devices. If your image is larger (e.g., 2400 x 3840), do not worry — e-readers automatically downscale covers to fit their display.
JPEG is the recommended format for book covers — it provides excellent image quality at small file sizes, keeping your EPUB lightweight and fast to load. Use PNG only if your cover contains text, sharp geometric shapes, or requires transparency (uncommon for book covers). WebP offers good compression but may not be supported by older e-readers — the tool converts it automatically. Avoid GIF and BMP for covers as they are either limited in color or produce unnecessarily large files.
Use the sRGB color profile for maximum compatibility across all devices. CMYK images (common in print design) may display with incorrect colors on digital screens. Ensure your cover has good contrast between the title text and background — remember that many e-readers display covers in grayscale on e-ink screens, so a cover that relies solely on color differentiation may not read well on a Kindle or Kobo.
E-reader library grids often display covers as small thumbnails (about 100-150 pixels wide). Make sure your book title and author name are large enough to be readable at thumbnail size. Avoid overly decorative fonts that become illegible when scaled down. A good test: zoom out your cover image to thumbnail size on your screen — if you can still read the title, it will work well on an e-reader.
Several legitimate sources provide high-quality book cover art: Open Library (openlibrary.org) has covers for millions of books; Google Books and Amazon product pages often have high-resolution cover images; ISBN databases like ISBNdb or the Library of Congress offer cover scans. You can also design your own cover using free tools like Canva, GIMP, or Photopea (a free browser-based Photoshop alternative). Set your canvas to 1600 x 2560 and export as JPEG for best results.
FAQ
id="cover-image" attribute or a <meta name="cover"> tag in the OPF file. EPUB3 uses the properties="cover-image" attribute on the manifest item. EPUB Cover Changer detects and handles both formats automatically, so you do not need to know which version your EPUB uses.<dc:date> and <meta property="dcterms:modified"> fields) so e-readers recognize the file has changed. Other metadata — title, author, publisher, language, description — remains unchanged. However, some e-readers may treat the modified file as a new book and reset reading progress. To avoid this, use the same filename when reimporting.Free. No sign-up. Works on iPhone, Android, Kindle, and every e-reader.
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