Frequently asked questions

Questions

What is the best free image converter that does not upload files?

Any converter that processes images with the Canvas API and WebAssembly in the browser keeps your files local. This one converts between 11 formats that way, with no account, no watermark and no daily limit. You can confirm nothing is transmitted by watching your browser's Network tab during a conversion.

Which image format is the smallest?

AVIF is usually smallest, at roughly half the size of a JPG at matched visual quality. HEIC matches it but is barely supported outside Apple devices. WebP is about 25-35% smaller than JPG and works in every modern browser, which makes it the practical choice for most websites.

Which image format should I use on a website in 2026?

WebP for photographs and general imagery, since every modern browser supports it and it is materially smaller than JPG or PNG. AVIF where you can serve a fallback for older browsers. SVG for logos and icons. Keep PNG only where you need lossless flat graphics with transparency.

What is the difference between lossy and lossless compression?

Lossy compression permanently discards image data to make the file smaller, and repeated re-saving compounds the damage. JPG, WebP, AVIF and HEIC are lossy. Lossless compression stores every pixel exactly, so re-saving never degrades the image. PNG, BMP, TIFF and GIF are lossless.

Does converting between formats reduce image quality?

It depends on the target. Converting to a lossless format such as PNG discards nothing further. Converting to a lossy format such as JPG or WebP discards some detail, controlled by the quality slider. Neither can restore quality already lost inside the source file.

Why is my PNG so much bigger than the JPG I converted from?

PNG is lossless and was designed for flat graphics, not photographs. A photographic PNG is typically 5-10 times the size of the same image as a JPG. That is expected behaviour, not a fault in the conversion.

Why does my transparent image have a white background now?

You converted to a format that cannot store transparency, such as JPG, BMP or PDF. Transparent pixels have to become something, so the converter paints a background underneath. Use the colour picker in the settings panel to choose a colour other than white, or convert to PNG or WebP to keep transparency.

Can I convert a PDF into images?

Yes. Drop a PDF in and every page is rendered at high resolution and offered as a separate image, or bundled into a ZIP. Going the other way, a set of images becomes one PDF with a page per image in the order you added them.

Is this converter safe for confidential documents?

The file never leaves your device, so no third party receives it. That removes the main risk of an online converter. As with any web page, the usual caveats about your own device and network still apply, and you should verify the behaviour yourself in the Network tab if the material is sensitive.

Do you store, view or train on my images?

None of the three, and not as a policy commitment but as an architectural fact. There is no upload endpoint, so no image ever reaches us. We could not view or retain your files even if we wanted to.

How many files can I convert at once?

There is no limit on the number of files. They convert one after another with individual progress, and you can download them separately or as a single ZIP built in your browser.

Do I need to install software or create an account?

Neither. There is no download, no browser extension, no account and no email address required. Open the page and convert.

Are my images really never uploaded?

Correct. The converter is JavaScript and WebAssembly running in your browser tab. Your file is read into that tab's memory, decoded, re-encoded and handed back as a download. There is no upload endpoint on our side, so there is nothing for us to store or leak. Open developer tools, watch the Network tab, and convert something to confirm it.

Which formats can I convert from?

JPG/JPEG, PNG, WebP, GIF, BMP, TIFF, ICO, SVG, HEIC/HEIF and AVIF, plus PDF (each page becomes an image).

Which formats can I convert to?

JPG, PNG, WebP, BMP, ICO, AVIF and PDF. GIF, TIFF and SVG are read-only: writing an animated GIF or tracing a bitmap into true vector SVG needs tooling well beyond a browser tab.

Why is there a 50 MB limit per file?

Conversion happens in your browser's memory. Very large images can exhaust a tab's memory and crash it — particularly on phones and tablets. 50 MB is a conservative ceiling that works reliably across devices. There is no limit on how many files you queue.

Does the quality slider matter for every format?

Only for lossy targets — JPG, WebP, AVIF and the images inside a PDF. For PNG, BMP and ICO the encoding is lossless and the slider is disabled. 85% is a good default: visually indistinguishable from the original for most photographs.

My animated GIF converted to a still image. Why?

Canvas-based decoding reads the first frame. Converting an animated GIF to PNG or JPG therefore gives you frame one as a still. To keep animation, keep the file as a GIF or use a dedicated video tool.

Can I convert something to SVG?

No. SVG is a vector format; turning a photograph into one requires tracing algorithms that produce large, approximate results. We read SVG and rasterise it out to PNG, JPG, WebP and the rest, but we do not pretend to write it.

Why does my JPG look different after converting from PNG?

JPG has no transparency. Any transparent pixels have to be filled with something, so the tool paints a background colour underneath — white by default, and changeable with the colour picker in the settings panel.

The converter says my browser cannot write a format. What now?

Browsers differ in which formats they can encode. AVIF in particular is native in recent Chrome and Safari, and falls back to a WebAssembly encoder elsewhere, which is slower. Updating your browser, or trying Chrome or Edge, resolves nearly all of these.

Does it work offline?

Once the page and the codecs it needs have loaded, conversion itself requires no network connection at all.

Is there a watermark, an account or a paywall?

None of the three. No watermark, no sign-up, no quota, no paid tier.

How do I convert several files at once?

Drop or select them all together. They convert one after another with per-file progress, and you can download them individually or as a single ZIP built in your browser.

Do you support HEIC photos from my iPhone?

Yes. HEIC and HEIF are decoded with a WebAssembly build of libheif that loads only when you actually add one, so people converting JPGs never pay for it in page weight.