Why did my transparent PNG get a white background?

Because you converted it to a format that cannot store transparency — JPG, BMP, or PCX. The transparent pixels are composited onto white, which is permanent. Convert to WebP or AVIF instead if you need a smaller file and the transparency.

Does converting JPG to PNG improve the image?

No. PNG is lossless, but it can only preserve what is already in the JPG. Detail the JPG discarded does not come back, and because PNG compresses photographs poorly, the file usually gets several times larger while looking identical.

Which format gives the smallest file?

AVIF, usually by a clear margin, followed by WebP. Both beat JPG substantially at the same visual quality. The trade-off is encoding time and, for AVIF, support outside the browser.

Can I convert several images at once?

Yes. Drop multiple files to convert them as a batch and download the results as a single ZIP, or combine them into one PDF, DOCX, or PPTX with drag-to-reorder before exporting.

Image Converter

Convert images between popular formats like JPG, PNG, WebP, HEIC, AVIF, TIFF, and SVG. Prepare images for websites, email, social media, or editing tools — free and in your browser.

All supported formats

JPG JPEG PNG WEBP GIF BMP TIFF ICO HEIC HEIF AVIF SVG EPS PDF

Choosing an image format

Image formats differ along three axes that matter in practice: whether the compression throws data away, whether the format can store a transparent background, and how widely it is supported. Almost every conversion decision comes down to trading one of those against another.

JPG is lossy, has no transparency, and is supported by absolutely everything. PNG is lossless, keeps transparency, and produces large files for photographs. WebP and AVIF are modern formats that give you smaller files than either while keeping transparency — at the cost of being rejected by some older software.

The formats you will actually choose between
Format	Use it when
JPG	A photo is going somewhere you do not control — email, a print shop, an upload form.
PNG	The image has transparency, hard edges, or text, and must stay exact.
WebP	You want a smaller file than PNG or JPG and control where it is used.
AVIF	You are serving images on a modern website and can provide a fallback.
GIF	You need a short animation. For stills there is always a better option.
TIFF	Print and archival workflows that specifically require it.
HEIC	It is what your iPhone produced. Convert before sending it anywhere else.
SVG	The artwork is vector — logos, icons, diagrams. Never for photographs.

What happens during an image conversion

Images are decoded into memory with Pillow and written back out in the target format. Where the target cannot represent something the source contains, the converter makes an explicit decision rather than leaving it to chance.

Transparency is the most common case. Converting to JPG, BMP, or PCX composites your image onto a solid white background using its own alpha channel as the mask, so a soft cutout edge blends into white rather than leaving stray colour data behind. More restrictive targets go further: MSP and PBM are dithered down to pure black and white, Palm is flattened and reduced to a 256-colour palette, and BLP is quantized to 256 colours while keeping its alpha channel.

Nothing else about the picture changes unless you ask. Resizing, cropping to an aspect ratio, and background removal are all opt-in, so a plain format change keeps the original pixel dimensions.

Converting images to documents

Images do not only convert to other images. A single image can be embedded into a PDF losslessly — the original bytes are copied into the page rather than re-compressed — and several images can be combined into one PDF, Word document, or PowerPoint deck, reordered by dragging before you export.

There is also an OCR path: converting an image to plain text runs it through a recognition engine and returns the words it can read. Accuracy depends on the source being clean, high-contrast, and straight.

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Frequently asked questions

Why did my transparent PNG get a white background?: Because you converted it to a format that cannot store transparency — JPG, BMP, or PCX. The transparent pixels are composited onto white, which is permanent. Convert to WebP or AVIF instead if you need a smaller file and the transparency.
Does converting JPG to PNG improve the image?: No. PNG is lossless, but it can only preserve what is already in the JPG. Detail the JPG discarded does not come back, and because PNG compresses photographs poorly, the file usually gets several times larger while looking identical.
Which format gives the smallest file?: AVIF, usually by a clear margin, followed by WebP. Both beat JPG substantially at the same visual quality. The trade-off is encoding time and, for AVIF, support outside the browser.
Can I convert several images at once?: Yes. Drop multiple files to convert them as a batch and download the results as a single ZIP, or combine them into one PDF, DOCX, or PPTX with drag-to-reorder before exporting.
Is the Image Converter free?: Yes, every conversion is completely free with no account and no watermark.
Do I need to install anything?: No. Use the tool from your browser; files are uploaded to our servers for processing.
Are my files safe?: Files are auto-deleted after 2 hours and are never shared.