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Convert images between PNG, JPEG, and WebP with a quality slider. See the final size before you download — 100% local
Image Format Converter is loading — interactive editor will appear here. Use examples below to try instantly once loaded.
Press ? for keyboard shortcuts
Converts images between PNG, JPEG, and WebP entirely in the browser. The image is drawn to a canvas and re-encoded with canvas.toBlob(type, quality): PNG output is lossless, while JPEG and WebP expose a quality slider from 1–100%. When the source has transparency and you choose JPEG, the tool warns you and composites onto a white background. The result is previewed next to the original with its final MIME type and byte size before you download.
Online file-conversion sites upload your images to a server you do not control. Image format conversion is a pure pixel operation — PNG, JPEG, and WebP encoders are built into every modern browser — so there is no reason for a file to leave the device just to change its format.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
Web developers optimizing images for performance, designers who need a quick PNG-to-JPEG export, and anyone who received a WebP image and needs a more compatible PNG or JPEG.
Click the drop zone or drag and drop an image (JPEG, PNG, GIF, or WebP, up to 10 MB)
Choose the target format: PNG (lossless), JPEG (lossy), or WebP
For JPEG or WebP, adjust the quality slider — lower values mean smaller files and more artifacts
If the image contains transparency and you select JPEG, read the warning: alpha is removed and filled with white
Click Convert and compare the original and converted previews
Check the reported MIME type and byte size, then click Download
Input: a 2 MB PNG screenshot converted to JPEG at 85% quality. Output: a ~200 KB JPEG, previewed with its exact byte size before download.Input: a WebP product image with transparency converted to PNG. Output: a lossless PNG that keeps the alpha channel for use in older tools.Is my image uploaded anywhere?
No. Conversion runs in your browser with the Canvas API; the file never leaves your device.
Which output formats are supported?
PNG, JPEG, and WebP. PNG ignores the quality slider because it is lossless.
Why did my transparent background become white in JPEG?
JPEG cannot store transparency, so the tool composites the image onto white and warns you first.
Why is my PNG output bigger than the JPEG input?
Lossless PNG stores every pixel; JPEG's lossy compression is far smaller for photos. Pick WebP or JPEG for photographic content.
What does the reported MIME type mean?
It is the actual format the browser encoder produced, read from the generated Blob, so you always know exactly what you downloaded.
Authoritative specifications, standards, and in-depth reading for Image Format Converter.
Click or drop an image here
JPEG, PNG, GIF, WebP · Max 10 MB · 100% local
Compress JPEG, PNG, and WebP images in your browser. Reduce file size without visible quality loss.
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Create animated GIF from images. Use when animating frames; for collages use image-collage. Input: images ≤10MB. Returns GIF. 100% client-side, files never leave browser.