Can I use the generated C header with Arduino and ESP32?

Yes! The `.h` file contains standard PROGMEM compatible byte arrays with image length definitions.

Does it support LVGL and embedded display libraries?

Yes! The array is formatted for easy inclusion into embedded C/C++ codebases.

Is conversion instant?

Yes, in-browser byte array serialization takes less than a millisecond.

Free WebP to C Array Converter | C/C++ Header Byte Array Generator

100% Free User-Side

WebP to C Array

Convert WebP images into C/C++ byte arrays (`const unsigned char image[]`) in standard `.h` header files for Arduino, ESP32, STM32, and OLED displays.

WebP - up to 100MB each

Drop your images here

or click anywhere to browse files

WebP - up to 100MB each

How to Convert WebP to C Array?

Upload JPG Images

Drop your JPG files into the upload zone above, or click to choose files from your device. You can convert multiple files at once.

Adjust Advanced Options (Optional)

Click the settings panel if you need to resize the images, customize background, or adjust AVIF compression quality.

Download Converted PNG

Click 'Convert to PNG' to process. You can download the AVIFs individually or as a single ZIP archive.

Full Transparency Support

Preserves 100% alpha channel transparency so your logos, icons, and cutouts look flawless on any background.

Next-Gen Compression

Delivers up to 50% smaller file sizes than PNG while retaining remarkable high-definition clarity.

100% Offline & Private

No network transfers. All images stay entirely inside your local device memory for complete cryptographic privacy.

What is a WebP file?

WebP is a modern open image format developed by Google specifically for web performance. Saved under the .webp extension, it offers efficient lossy and lossless compression for web graphics.

Why convert WebP to a C Array?

Embedded hardware platforms like Arduino, ESP32, STM32, and Raspberry Pi Pico microcontrollers lack operating systems and WebP decoders. Converting a WebP image into a C Array compiles the pixel data into a static byte array that can be linked straight into microcontroller flash memory for display on LCD and OLED screens.

Developed by: Google

Initial Release: September 30, 2010

What is a C Array image file?

A C Array image file is a C or C++ source header file (typically saved with .c or .h extensions) containing image pixel data represented as a comma-separated list of hexadecimal byte values. This allows compilers like GCC and Clang to link the graphical asset directly into firmware binaries for instant hardware display.

How to use C Array image data in embedded software?

You simply #include "image.h" in your microcontroller code and pass the byte array pointer to your display library, such as TFT_eSPI, Adafruit_GFX, or LVGL. The graphic renders immediately on your OLED or LCD screen without requiring an SD card reader or file system.

Our local tool converts any WebP graphic into clean, production-ready C Array source code directly in your browser with zero network latency.

Developed by: Dennis Ritchie (ANSI C Standard)

Initial Release: 1972

FAQs

Can I convert WebP to C Array free of charge and without limits?

Absolutely. You can convert WebP to C Array free with no hidden paywalls, no watermarks, and no daily file caps. It is a completely free image converter built for developers and everyday users alike.

Why is a client-side WebP to C Array converter safer for personal photos?

An offline architecture ensures that sensitive documents, financial screenshots, or family photos remain entirely inside your device memory. As a secure local PNG converter no server upload, it provides total cryptographic privacy because your files never leave your browser.

Does AVIF support PNG transparency?

Yes! AVIF features advanced alpha-channel coding that completely preserves translucent and transparent graphics with zero black box artifacts.

Why Choose Our WebP to C Array Converter?

We designed our tool to be the fastest and safest option available. Here’s how our private WebP to C Array converter gives you an edge:

100% Private & Secure: All processing happens locally on your device. Since there is no server upload, your personal and sensitive images are never stored or seen by anyone else.
Preserve Transparency: Clean alpha transparency retention guarantees your graphics and icons render flawlessly.
Instant Performance: Enjoy unthrottled speeds with zero cloud latency. Whether you use it on a desktop or need to convert WebP to C Array on mobile, it feels like a native app.
Bulk ZIP Packaging: Process multiple images in seconds and download them all together in a single convenient ZIP file.

About this tool

The WebP to C Array converter by FreeImgLab offers a secure and high-speed way to change WebP to C Array directly from your browser. We prioritize your privacy - our offline WebP to C Array transformer runs entirely on your device, meaning your photos are never uploaded to any server. If you need to reduce your file weight after converting, try our Bulk Image Compressor.

Fully running inside a safe browser-based client-side engine, it outputs crisp, modern AVIF images without any latency or artificial limits. Get professional-grade results without paying for a subscription. You can also securely scale dimensions using our Bulk Image Resizer.