About Convert Image
Convert between PNG, JPG and WebP — single files or batches, entirely in your browser. SnapToolz uses the Canvas API's native encoders, so the output is identical to what Chrome / Safari / Firefox produce for that format natively. WebP usually saves 25-35% over JPG at the same visible quality; PNG is the right pick for transparency or lossless re-encoding. Transparent PNG to JPG flattens onto a configurable background (white by default). Quality slider for lossy formats. HEIC photos from iPhone are auto-detected and converted to a target you choose. No upload, no watermark.
- No uploads
- Browser-only
- Works offline
- 100% free
How it works
- 1
Drop your images
PNG, JPG, WebP, HEIC, GIF, AVIF — any modern browser format. Single or batch.
- 2
Pick the target format
JPG (smaller, lossy), PNG (lossless, transparency), or WebP (smallest with broad modern support). Quality slider applies to lossy formats.
- 3
Convert and download
Single image = direct download. Batch = ZIP. Filenames keep their basename with the new extension.
Related tools
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Frequently asked questions
Are my files uploaded to a server?
No. Every tool on SnapToolz runs entirely inside your browser using JavaScript and WebAssembly. Your file is read locally, processed in memory, and the result is offered as a download. Nothing is sent to a server — there isn't one to send to.
Which format should I pick?
JPG for photographs going to a system that demands JPG (some forms, email clients). WebP for modern websites — smaller files at the same visual quality, supported in every browser since 2020. PNG when you need transparency or when re-encoding lossy → lossy would compound quality loss.
What happens to transparency when I convert to JPG?
JPG doesn't support transparency, so transparent regions flatten onto a background colour (white by default; configurable). For images with semi-transparent edges, the antialiasing pixels blend with the background — usually invisible against white, more obvious on coloured backgrounds.
Does it handle HEIC from iPhone?
Yes — HEIC images are auto-detected on drop. The browser's built-in decoder (Safari natively, Chrome/Edge via fallback) reads the file, and the converter writes to your chosen format. Useful for sharing iPhone photos with people who can't open HEIC.
How is this different from Compress Image?
Convert changes the file format (e.g. PNG → JPG). Compress reduces the file size without necessarily changing the format. Use Convert for format-targeted output, Compress for size-targeted output. For 'I need this PNG to be smaller, format doesn't matter' use Convert to WebP.
Does it work offline?
Yes. SnapToolz is a Progressive Web App. After your first visit, the app is cached on your device and every tool keeps working without an internet connection.
Is SnapToolz free?
Yes — every tool is 100% free with no sign-up, no watermark, no hidden tier. The whole platform is open source and we have no plan to gate features.