About

Image compatibility remains a significant hurdle in web development and digital archiving. Legacy systems often reject modern formats like WebP, while high-performance web pages demand the compression efficiency of AVIF. Incorrect formatting leads to slow load times or broken layouts. This tool processes raw pixel data directly within the browser using the HTML5 Canvas API. It eliminates server-side uploads. This ensures data privacy and zero latency.

Accuracy in conversion involves more than changing file extensions. Transparency channels (Alpha) in PNGs turn into jagged black artifacts when converted to JPEGs without proper handling. This converter allows specific background blending to preserve visual integrity. Furthermore, privacy is enforced by default. The reconstruction of the image on a canvas strip effectively scrubs EXIF data, GPS coordinates, and camera serial numbers from the final output.

Formulas

The core of image conversion relies on re-encoding pixel data. When calculating the estimated file size or Aspect Ratio (AR), strict mathematical relationships apply.

Aspect Ratio Calculation:

AR = WH

Where W is width and H is height. If resizing while maintaining aspect ratio, the new height H_new is calculated as:

H_new = W_newAR

Compression quality (q) in lossy formats acts as a coefficient reducing the high-frequency data in the Discrete Cosine Transform matrices.

Reference Data

Format	MIME Type	Transparency (Alpha)	Compression Algo	Typical Use Case
JPEG	image/jpeg	FALSE	Lossy (DCT)	Photography, High-color depth, Prints
PNG	image/png	TRUE	Lossless (Deflate)	Logos, Text, Screenshots, Overlays
WebP	image/webp	TRUE	Lossy & Lossless	Modern Web, General Purpose
AVIF	image/avif	TRUE	AV1 Codec	Next-Gen Web, High Efficiency
GIF	image/gif	TRUE (1-bit)	LZW (Limit 256 colors)	Simple Animations, Retro Graphics
BMP	image/bmp	FALSE	Uncompressed	Windows Internal, Raw Data
TIFF	image/tiff	TRUE	Variable	Print Industry, Scanning
ICO	image/x-icon	TRUE	BMP/PNG container	Favicons, System Icons

Frequently Asked Questions

This occurs when converting a format with an Alpha channel (like PNG or WebP) to a format without one (like JPEG). The missing pixel data defaults to zero values (black). To fix this, use the "Background Fill" option in this tool to explicitly set a white or custom color matte before conversion.

Yes. This tool uses the Canvas API to redraw the image pixel-by-pixel. This process constructs a completely new file structure. Metadata segments such as EXIF (which contains camera model, date, and GPS coordinates) are not copied to the new file, ensuring the output is scrubbed of sensitive personal data.

AVIF encoding requires support from the underlying browser engine. While most modern versions of Chrome and Firefox support it, older browsers or Safari versions might not implement the encoder yet. If unsupported, the browser may fallback to PNG or fail to generate the file.

Significantly. Image file size is roughly proportional to the total pixel count ($W \times H$). Reduces dimensions by 50% reduces the total pixel count (and thus uncompressed data size) by 75%. This is often the most effective way to optimize images for the web alongside format selection.