Image Converter
Pick a PNG, JPEG, or WebP file, choose the format you want instead, and download the result — the image never leaves your device.
Overview
Image format choice is usually a tradeoff between compatibility, file size, and quality. PNG is lossless and supports transparency, which makes it the safe default for graphics and screenshots, but it produces larger files for photos. JPEG compresses photos well but has no transparency support and loses detail every time it's re-saved. WebP generally beats both on file size at a comparable quality, but older tools and some email clients still don't handle it well. This tool converts between all three so you can pick the right format for wherever the image is going, without installing an image editor.
Conversion happens using the browser's built-in Canvas API: the image is drawn onto an in-memory canvas, then re-encoded in the target format. That's the same mechanism a browser uses internally to decode and display images, so there's no server-side processing step and no upload — the file is read, converted, and offered back for download entirely on your machine.
For JPEG and WebP output, a quality slider controls the compression level. Lower quality means a smaller file at the cost of visible compression artifacts; higher quality keeps more detail but produces a larger file. PNG output ignores this setting, since PNG compression is lossless — there's no quality/size tradeoff to make.
Examples & Sample Data
Converting a PNG to WebP
photo.png
photo.webp (smaller file size, same image)
How It Works
- Click the file input and choose a PNG, JPEG, or WebP image from your device.
- Select the output format you want to convert to.
- If converting to JPEG or WebP, adjust the quality slider to balance file size against image detail.
- Click Convert to run the conversion in your browser.
- Preview the converted image, then click Download to save it.
Common Use Cases
Shrinking images for a website
Convert PNG screenshots or graphics to WebP to reduce page weight and improve load times, without a build pipeline or image CDN.
Preparing a photo for email or upload
Convert a large PNG photo to JPEG at a lower quality setting to fit a file size limit.
Getting transparency back
Convert a JPEG that was exported without transparency into PNG if you need an alpha channel for further editing — note this only adds PNG's transparency support, it can't recover transparency the JPEG never had.
Standardizing a batch of mixed formats
Convert one-off images to a single consistent format before uploading them somewhere that expects a specific file type.
Tips & Best Practices
- WebP usually produces the smallest file for a given visual quality, but check that wherever you're using the image actually supports it.
- Converting a JPEG to PNG doesn't add back detail lost to earlier JPEG compression — it just changes the container format.
- If the source image has transparency, converting to JPEG will lose it, since JPEG has no alpha channel.
- For photos, start the quality slider around 80% — it's usually indistinguishable from 100% at a meaningfully smaller file size.
- Very large source images may take a few seconds to process, since encoding happens on your device rather than a server.
Frequently Asked Questions
No. The conversion happens entirely in your browser using the Canvas API — your image is never uploaded or sent anywhere.
PNG, JPEG, and WebP as both input and output. Formats like HEIC or vector formats like SVG are not supported, since browsers can't decode or rasterize them through the Canvas API used here.
JPEG and WebP are lossy formats — lower quality means a smaller file size at the cost of some image detail. PNG output ignores the quality setting since it's lossless.
No. The width and height stay the same — only the file format and, for lossy formats, the compression change.
No hard limit is enforced, but very large images may be slow to process since conversion runs in your browser rather than on a server.
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