PNG to JPG Converter
Convert PNG images to JPEG locally in your browser and fill transparent regions with white or any custom hex color.
Local Workspace (image-converter)
Max 25 MB/file • Up to 10 files • .pngHow to Use PNG to JPG Converter
- 1Select up to 10 PNG (.png) files up to 25 MB each from your device.
- 2Choose a Transparency Fill Color (White #FFFFFF, Black #000000, Light Slate #F8FAFC, or any custom 6-digit hex code) and set JPEG quality.
- 3Inspect the composited image in the split-curtain viewer and download individual .jpg files or a batch .zip archive.
Technical Specifications & Guardrails
- Custom hex color compositing prevents transparent PNG backgrounds from turning solid black
- Strict PNG IHDR binary signature verification (89 50 4E 47 0D 0A 1A 0A)
- Adjustable JPEG output quality from 10% to 100% with keyboard-accessible controls
- 100% local processing inside a dedicated Web Worker with zero cloud uploads
Practical Example: Flattening Transparent PNG Logos for Legacy Upload Portals
- Sample Input
- 2.4 MB transparent PNG company logo (2000x2000 px RGBA) rejected by a government portal that only accepts JPEG.
- Verified Local Output
- Composited cleanly onto a #FFFFFF pure white background and encoded as a 195 KB JPEG at 85% quality.
Operational Limits & Browser Guardrails
Accepts only authentic PNG files verified by the 8-byte PNG signature (up to 10 files per batch, 25 MB per file). Because the JPEG specification does not support alpha transparency, semi-transparent pixels are permanently flattened onto your selected solid fill color.
Frequently Asked Questions
What happens to transparent areas when converting PNG to JPG?
Because the JPEG specification does not support an alpha channel, FetchToolKit composites transparent pixels onto your selected background color (white #FFFFFF by default) before encoding.
Can I enter an exact brand hex color code without dragging a color picker?
Yes. Alongside the native color input and quick preset buttons, a plain-text hex field lets you type any 6-digit hex color code directly.
Why does converting a PNG screenshot to JPEG reduce file size so dramatically?
Screenshots of photographs or gradients contain thousands of unique color values that defeat PNG lossless Deflate compression, whereas JPEG chroma subsampling and DCT quantization compress continuous-tone imagery by 70% to 85%.