nTools

Image format converter

Convert JPEG, PNG and WebP images locally with live previews, quality control and file-size comparison.

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How to use

Choose a JPEG, PNG or WebP image (up to 30 MB and 40 megapixels). The tool converts it straight away: to WebP, or to JPEG if the original is already WebP, and shows both versions side by side with their dimensions and file sizes. Changing the format or moving the quality slider converts again automatically; the download button saves the result under the original name plus -converted and the new extension (for example photo-converted.webp); unusual characters become hyphens.

JPEG suits photos but has no transparency, so transparent areas are filled with white. PNG is lossless and keeps transparency, which makes it the format for logos, screenshots and graphics with sharp edges, but photos saved as PNG are usually much larger. WebP keeps transparency and is often smaller than JPEG at similar quality. It is lossy below 100%; at 100%, Chrome and Edge save it lossless. The quality slider (10–100%, 85% by default) applies to JPEG and WebP; PNG output is always lossless.

The image keeps its width and height. Conversion redraws it in the browser, so camera metadata such as the date, the camera model and GPS location is not carried over to the new file, and photos taken in portrait are saved the right way up rather than with a rotation tag. An animated image becomes a single still frame, usually the first.

Converting cannot add detail that was lost: a JPEG converted to PNG keeps its compression artefacts and only gets bigger. Converting a lossy file several times, or at low quality, makes the losses add up, so work from the original when you can. Safari, and every browser on iPhone and iPad, cannot create WebP files this way and produces PNG instead; the result shows the format you actually got.

Everything happens on your device. The image is not uploaded to nTools or to any conversion service.

Example

  • Phone photo, JPEG → WebP at 85%Usually a noticeably smaller file with no visible difference; the result shows the exact change in percent.
  • Logo with a transparent background, PNG → JPEGThe transparent background becomes white, because JPEG cannot store transparency. Choose WebP or keep PNG to preserve it.
  • Screenshot, PNG → WebPOften much smaller, but at the default 85% WebP is lossy and small text can soften; check the preview, or use 100%.
  • JPEG → PNGA larger file with the same image: PNG keeps every pixel as it is, including the JPEG artefacts.

Frequently asked questions

Does quality affect PNG output?

No. PNG output is lossless in this tool; the quality control applies to lossy JPEG and WebP encoding.

Why is the converted file bigger than the original?

Usually because a photo was saved as PNG, or a well-compressed file was saved again at a higher quality. Try WebP or JPEG at a lower quality.

Is the location in my photo removed?

Yes, from the converted file. It is drawn from the pixels only, so EXIF data, including GPS coordinates, is not copied.

Can I convert HEIC or AVIF?

This tool accepts JPEG, PNG and WebP. For iPhone HEIC photos, use the HEIC to JPEG converter.

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