Free Online Tool

Change Your PDF Cover Instantly

Upload your PDF 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.

100% in-browser No file uploads No sign-up needed

Cover Changer

Drop your PDF and a new cover image below. We will combine them for you.

Drop PDF file .pdf

Loading cover...

Replace

✓

Drop cover image .png .jpg .jpeg .webp .gif .bmp .tiff .heic .heif

Replace

✓

❖

Changed Successfully

WORKS EVERYWHERE

Change PDF Cover on Any Device

No matter which e-reader or phone you use, PDF Cover Changer works directly in your browser — no extra software required.

iOS

iPhone & iPad

Change PDF cover on iPhone or iPad using Safari, Chrome, or any mobile browser. The new PDF downloads straight to your Files app, ready to open.

ANDROID

Android

Change PDF cover on any Android phone or tablet. Works with any PDF reader app.

E-INK

Kindle, Kobo & More

Change PDF cover for Kindle, Kobo, Nook, or any e-reader. Change the cover then transfer via USB or email.

Unlike Calibre or other desktop tools, PDF Cover Changer runs entirely in your browser — no installation, no plugins, no account needed.

HOW IT WORKS

Three Steps to a New Cover

Upload

Drag and drop your PDF file and the new cover image into the two slots. Everything stays in your browser.

Change

Click the change button and watch your files combine. Processing takes just seconds.

Download

Your new PDF with the replaced cover is ready. Download instantly — no sign-up, no watermark, no limits.

WHY CHOOSE US

Why PDF Cover Changer Is Different

Not all PDF cover tools are the same. Here is what makes this tool unique.

100% Client-Side Processing

Your files never leave your device. Unlike other tools that upload your PDF to a server, PDF Cover Changer runs entirely in your browser using JavaScript. Your content stays private — always.

No Sign-Up, No Watermark, No Ads

Many free PDF tools require an account, add watermarks to your output, or bombard you with ads. PDF Cover Changer has none of that — just a clean, fast tool that works.

Works on Every Device

Whether you are on iPhone, Android, Kindle, Kobo, or desktop, the tool works the same way. No app installation, no Calibre setup, no plugins — just your browser.

Preserves PDF Metadata

When you change the cover, the original PDF metadata, formatting, bookmarks, and all other pages remain intact. Only the cover image is replaced.

Supports 10+ Image Formats

PNG, JPG, JPEG, WebP, GIF, BMP, TIFF, HEIC, HEIF — drag and drop any common image format. The tool handles the conversion automatically.

Smart Device Adaptation

The tool automatically detects your device's memory and adjusts file size limits accordingly — up to 500 MB for PDFs and 100 MB for images on high-end devices.

UNDER THE HOOD

How PDF 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.

1

PDF Validation

The file is checked to ensure it starts with %PDF magic bytes, confirming it is a valid PDF document. The file size is also validated against device memory limits — up to 500 MB on high-end devices.

2

PDF Parsing

The PDF is loaded into memory using pdf-lib, a pure JavaScript PDF manipulation library. It parses the document structure including cross-reference tables, the page tree, and document metadata. The tool reads the first page dimensions and identifies all existing pages.

3

Image Decoding & Format Conversion

The new cover image is decoded from its binary format. Non-standard formats like HEIC, HEIF, TIFF, and BMP are converted to JPEG using the Canvas API — since PDF readers may not support these formats natively. PNG and JPEG images are processed directly without conversion.

4

Cover Image Embedding

The processed image is embedded into the PDF document as a new image object. PNG images are embedded using FlateDecode (lossless compression) via embedPng(), while JPEG images retain their original DCT compression via embedJpg(), preserving image quality.

5

First Page Replacement

The tool retrieves the dimensions of the first page and draws the new cover image over it, filling the entire page area. All other pages, bookmarks, links, annotations, and document metadata remain completely untouched.

6

PDF Serialization & Download

The modified PDF document is serialized back into a valid PDF binary using pdf-lib's save() method, which rebuilds the cross-reference table and file structure. The resulting Blob is offered as a download with the original filename.

FAQ

Frequently Asked Questions

What formats are supported?

Upload .pdf files and .png, .jpg, .jpeg, .webp, .gif, .bmp, .tiff, .heic, or .heif cover images. The new image replaces the existing cover in the PDF while preserving all other content.

Is there a file size limit?

PDF files up to 50-500 MB and cover images up to 10-100 MB (adjusted based on your device memory). All processing happens locally in your browser, so speed depends on your device.

Are my files uploaded anywhere?

No. PDF Cover Changer processes everything client-side using JavaScript. Your PDF and images never leave your device — complete privacy by design.

What image dimensions should I use?

Most e-readers display covers at 1600 x 2560 pixels (roughly 2:3.2 ratio). Use that resolution or higher for the sharpest results across all devices.

How to change PDF cover on iPhone?

Open this page in Safari or Chrome on your iPhone. Tap the left slot to choose your PDF file from the Files app, tap the right slot to pick your new cover image from Photos, then tap Change. The new PDF downloads to your Files app — open it and the new cover appears immediately.

Can I change PDF cover on Kindle?

Yes. Change the new PDF cover on any device using this tool, then send the updated PDF file to your Kindle via Send to Kindle, email, or USB cable. This works for Kindle Paperwhite, Oasis, Scribe, and the Kindle app.

How to change PDF cover without Calibre?

PDF Cover Changer is a browser-based alternative to Calibre for changing PDF covers. No software installation needed — upload your PDF and a new cover image, click change, and download. Works on phones, tablets, and computers.

What is the best free PDF cover changer?

PDF Cover Changer is a free, privacy-first PDF cover changer that works entirely in your browser. No file uploads to servers, no sign-up, no watermark, no ads. Supports PNG, JPG, and JPEG cover images up to 100 MB.

Ready to Change Your PDF Cover?

Free. No sign-up. Works on iPhone, Android, Kindle, and every e-reader.

Start Changing