Altere a Capa do Seu EPUB Instantaneamente
Envie seu arquivo EPUB e uma nova imagem de capa, combine-os no seu navegador e baixe o resultado. Funciona no iPhone, Android, Kindle, Kobo e todos os e-readers.
Trocador de Capa
Solte seu EPUB e uma nova imagem de capa abaixo. Nós os combinaremos para você.
FUNCIONA EM TODOS OS LUGARES
Altere a Capa do EPUB em Qualquer Dispositivo
Não importa qual e-reader ou celular você use, o Alterar Capa EPUB funciona diretamente no seu navegador — sem software extra necessário.
iPhone & iPad
Altere a capa do EPUB no iPhone ou iPad usando Safari, Chrome ou qualquer navegador móvel. O novo EPUB é baixado direto no app Arquivos, pronto para importar no Apple Books.
Android
Altere a capa do EPUB em qualquer celular ou tablet Android. Funciona com Moon+ Reader, Lithium e outros apps de leitura Android.
Kindle, Kobo & Mais
Altere a capa do EPUB para Kindle, Kobo, Nook ou qualquer e-reader. Altere a capa e transfira via USB ou e-mail.
COMO FUNCIONA
Três Passos para uma Nova Capa
Enviar
Arraste e solte seu arquivo EPUB e a nova imagem de capa nos dois slots. Tudo permanece no seu navegador.
Alterar
Clique no botão de alterar e veja seus arquivos serem combinados. O processamento leva apenas alguns segundos.
Baixar
Seu novo EPUB com a capa substituída está pronto. Baixe instantaneamente — sem cadastro, sem marca d'água, sem limites.
POR QUE ESCOLHER
Why EPUB Cover Changer Is Different
Unlike generic online converters, EPUB Cover Changer is built specifically for EPUB cover replacement with a focus on privacy, performance, and format fidelity.
True Client-Side Processing
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.
Full EPUB Format Preservation
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.
Adaptive Performance
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 devices handle up to 500 MB / 100 MB. This prevents browser crashes while maximizing capability on powerful hardware.
Broad Format Support
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.
SOB O CAPÔ
How EPUB Cover Replacement Works
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.
EPUB Extraction
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.
Cover Image Identification
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.
Image Processing & Replacement
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.
Manifest & Metadata Update
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.
Repackaging & Download
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.
FAQ
Perguntas Frequentes
Quais formatos são suportados?
Existe um limite de tamanho de arquivo?
Meus arquivos são enviados para algum lugar?
Quais dimensões de imagem devo usar?
Como alterar a capa do EPUB no iPhone?
Posso alterar a capa do EPUB no Kindle?
Como alterar a capa do EPUB sem o Calibre?
Qual é o melhor trocador de capa EPUB grátis?
Pronto para Alterar a Capa do Seu EPUB?
Grátis. Sem cadastro. Funciona no iPhone, Android, Kindle e todos os e-readers.
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