Convert an Image
Pick an image, choose a target format — it's converted in your browser, nothing is uploaded.
Convert an image in your browser
Pick an image, choose a target format (JPEG, PNG, or WebP), and get a converted copy instantly. The conversion runs entirely in your browser with ffmpeg compiled to WebAssembly — your image is never uploaded to a server.
Formats
- JPEG — small, lossy; great for photos. The quality knob (1-100) controls compression.
- PNG — lossless; great for graphics and transparency. Quality is ignored.
- WebP — modern, smaller than JPEG/PNG at similar quality.
Tips
- Leave quality blank to use the default (85). It only affects JPEG and WebP.
- Works offline once the page has loaded.
FAQ
What image formats can I convert to and from?
The output is JPEG, PNG, or WebP — those are the three targets the tool offers. The input can be anything the bundled ffmpeg decoder reads, which covers all the everyday formats: JPEG, PNG, WebP, GIF, BMP, TIFF and more. If ffmpeg can't decode the file, the conversion fails with an error rather than producing a broken image.
How does the quality setting work?
Quality runs from 1 to 100 (default 85) and only applies to JPEG and
WebP — under the hood it's mapped onto ffmpeg's -q:v scale. PNG is a lossless
format, so the quality value is ignored entirely when PNG is the target.
What happens to transparency when I convert a PNG to JPEG?
It's lost — JPEG has no alpha channel, so transparent regions get flattened into a solid background. If you need to keep transparency while shrinking the file, convert to WebP instead, which supports alpha and usually compresses better than PNG.
Will converting a JPEG to PNG make it sharper?
No. PNG stores the pixels losslessly, but the JPEG compression artifacts are already baked into those pixels — you'll get a much larger file with exactly the same visual quality. Converting in that direction only makes sense when a workflow strictly requires a PNG.
Popular conversions
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool image-convert 'url=https://example.com/input' 'format=jpeg' 'quality=85'New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/image-convert/?url=https://example.com/input&format=jpeg&quality=85Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.