Caspian Office

Image converter

Convert images to PNG, JPG, WebP or AVIF — including from iPhone HEIC photos and SVG — with a quality slider and optional resizing, one at a time or in a batch. Download each, or all as a ZIP. Fully offline.

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Private · runs in your browserOffline · after first loadFree · no signup

What is the image converter?

A private image converter that turns images into PNG, JPG or WebP — including iPhone HEIC photos and SVG files — with a quality slider and optional resizing. Convert one image or a whole batch, then download each file or all of them as a ZIP. It runs fully offline in your browser, so nothing is uploaded.

How to use Image converter

  1. Add your images — Drop in one or more files, including HEIC photos from an iPhone or SVG vectors.
  2. Choose the output format — Pick PNG, JPG or WebP as the target format for all the images in your batch.
  3. Set quality and resizing — Adjust the quality slider, and optionally fit within a maximum width and height or scale by a percentage.
  4. Convert and download — Run the conversion, then download each image individually or grab everything as a single ZIP.

Frequently asked questions

Are my images uploaded during conversion?

No. Conversion runs entirely in your browser, so your files stay on your device and the tool works offline after the first load.

Can it convert iPhone HEIC photos?

Yes. HEIC photos are supported as input and can be converted to PNG, JPG or WebP so they open anywhere.

Can I convert several images at once?

Yes. Add a batch of images, convert them all to the chosen format, and download them together as a ZIP.

Does the quality slider apply to PNG?

PNG is lossless, so the quality slider mainly affects compressed formats like JPG and WebP. Use it to balance file size against detail.

Can I resize while converting?

Yes. You can fit the image within a maximum width and height — which never upscales — or scale it by a percentage as part of the conversion.

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