What the image converter does
The CubTools image converter changes your images from one format to another: PNG to JPG, JPG to WebP, WebP to PNG, and every combination between. Select up to 20 images and each converts automatically — no upload, no queue, no account.
Every converted image gets its own card showing the original and new sizes, so you can confirm the conversion actually helped before downloading. Grab files individually or take them all as one ZIP.
Converting step by step
Choose your images — they start converting the instant you select them. Pick the target format from the options: JPG for universal photo compatibility, PNG for lossless quality and transparency, WebP for the smallest modern files.
If you are converting to a lossy format (JPG or WebP), the quality slider controls the size-versus-fidelity balance, and everything re-converts automatically when you adjust it. Review the cards, then download. That is the entire process.
Which target format to pick
Heading to the web? WebP is the modern default — dramatically smaller than JPG with transparency support. Need maximum compatibility with old software or picky upload forms? JPG remains the format nothing chokes on.
Converting to PNG makes sense when you need lossless quality or when the source has transparency worth preserving. Just remember: converting a lossy JPG to PNG will not restore lost quality — it only makes a bigger file.
After the conversion
Spot-check the results before using them: open a converted image and confirm it looks right, especially if transparency was involved. Then replace the old files wherever they are used — a converted image sitting in your downloads folder helps no one.
Keep the originals if the conversion was lossy. You can always convert again from the master, but you cannot recover quality from a converted copy.
Converting for specific destinations
Different destinations reward different targets. Publishing to a modern website or blog? WebP at 75–80 gives the smallest files at full visual quality. Submitting to a form, portal, or print shop? JPG is the format nothing rejects — maximum compatibility beats maximum efficiency when a deadline is on the line. When a platform lists several accepted formats, prefer the smallest modern one it supports — you get the size win without risking rejection.
For archives and future editing, convert to PNG: lossless means the converted file becomes a trustworthy master for later work. And when transparency matters — logos, overlays, interface graphics — PNG or WebP are your only safe targets, because JPG flattens transparency without asking.
Steps
- Open the CubTools image converter in your browser — no sign-up needed.
- Select up to 20 PNG, JPG, or WebP images; conversion starts automatically.
- Choose the target format: WebP for smallest files, JPG for compatibility, PNG for lossless/transparency.
- If converting to JPG or WebP, adjust the quality slider to taste.
- Review each card's before/after sizes to confirm the conversion helped.
- Download images individually or as a single ZIP.
Frequently asked questions
Is the image converter free?
Yes — completely free, no account, no watermarks, no limits on batches. Everything runs locally in your browser.
Which formats can I convert between?
PNG, JPG, and WebP in any direction: PNG to JPG, JPG to WebP, WebP to PNG, and every other combination.
How many images can I convert at once?
Up to 20 per batch. They convert automatically on selection, each with its own result card.
Will converting reduce quality?
Converting to a lossless format (PNG) preserves pixels exactly. Converting to JPG or WebP is lossy — use the quality slider to control the trade-off.