What This Tool Does
This image format converter translates images between PNG, JPG, and WebP formats. Useful for converting WhatsApp WebP stickers to PNG, replacing huge PNG photos with smaller JPG files, or modernizing JPG archives to WebP. The tool handles transparency correctly — converting PNG-with-transparency to JPG fills the background with your chosen color.
Inputs Explained
- Image File: Upload PNG, JPG, WebP, GIF, or BMP (up to 20 MB).
- Output Format: PNG (lossless), JPG (small, no transparency), or WebP (modern, smaller).
- Quality: For JPG and WebP (0-100). Ignored for PNG.
- Background Color: Used when converting transparent PNG to JPG (which has no transparency).
How It Works
The source image is decoded by the browser and drawn onto a Canvas element. The canvas is then re-encoded in the target format using canvas.toBlob() with your chosen quality. For JPG output with transparent sources, the canvas is first filled with your background color.
Formula / Logic Used
Image Format Converter (PNG ↔ JPG ↔ WebP)
Convert images between PNG, JPG, and WebP with one click — all in your browser.
Step-by-Step Example
Common conversions and typical savings:
- PNG photo → JPG (quality 85): 70-90% smaller. Huge win — PNG wastes space on photographs.
- JPG → WebP (quality 85): 25-35% smaller at the same visual quality.
- PNG graphic → WebP: 25-50% smaller, lossless mode available.
- WebP → PNG: Larger file, but needed for older software that can't read WebP.
- WhatsApp WebP stickers → PNG: Convert for use in Photoshop, Figma, or older platforms.
Use Cases
- Convert WhatsApp stickers: Turn .webp WhatsApp stickers into PNG for use in other apps.
- PNG photo cleanup: Find PNG screenshots of photos and convert to JPG for massive size savings.
- Modern web delivery: Convert JPG/PNG archives to WebP for faster-loading websites.
- Legacy compatibility: Convert WebP to PNG/JPG for systems that don't support WebP (older email clients, legacy software).
- Transparency workflows: Flatten transparent PNGs to JPG with a specific background color for specific use cases.
Assumptions and Limitations
- Converting JPG to PNG doesn't restore lost quality — PNG just stores the same lossy JPG pixels in a bigger file.
- WebP encoding requires Chrome, Firefox, Safari 14+, or Edge. Older browsers can't generate WebP.
- Animated formats (animated WebP, GIF) lose animation when converted — only the first frame is kept.
- HEIC/HEIF iPhone images may not be supported depending on your browser — try JPEG from iPhone settings first.
Frequently Asked Questions
PNG vs JPG — when should I use each?
JPG: photographs, photos, complex images where file size matters. PNG: screenshots, logos, diagrams, anything with sharp edges, transparency, or large flat colored regions. JPG uses lossy compression (smaller), PNG is lossless (bigger).
Is WebP better than JPG?
For most uses, yes — WebP is 25-35% smaller at the same visual quality. Every modern browser supports it (Chrome, Firefox, Safari 14+, Edge). Use WebP for new websites unless you need to support very old browsers.
Why does my PNG become much smaller when converted to JPG?
PNG stores each pixel exactly — great for graphics, wasteful for photos where each pixel has subtle variations. JPG uses specialized compression that exploits how human vision works, making photo files 5-10× smaller.
What happens to transparency when I convert PNG to JPG?
JPG doesn't support transparency, so the transparent parts are filled with a background color (white by default, customizable). For transparent graphics, stick with PNG or convert to WebP (which supports transparency).
Why is my JPG larger after converting to PNG?
JPG is lossy — some data was discarded to make it small. PNG is lossless — it preserves every pixel exactly, including the JPG compression artifacts. So JPG→PNG usually produces a larger file that looks identical to the JPG.
Can I convert HEIC iPhone photos?
Browser support varies. Safari on iOS handles HEIC natively, Chrome/Firefox often can't. If HEIC fails, change your iPhone setting to take photos in 'Most Compatible' (JPEG) mode under Camera → Formats.
What about AVIF format?
AVIF is newer than WebP with even better compression (30-50% smaller than JPG). Browser support is still growing — Chrome, Firefox, Safari 16+ support it. This tool supports the widely-compatible PNG/JPG/WebP trio.
Is my image uploaded?
No. The conversion happens entirely in your browser. Your image never leaves your device. You can even use this tool offline once the page has loaded.
Sources and References
- MDN — Image file type guide — Comparison of image formats and when to use each.
- web.dev — Choose the right image format — Google's recommendations for format selection.
- WebP — Google Developers — Official WebP documentation.
- Can I Use — WebP — Browser support for WebP format.