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Image Converter
Change image formats without a round trip to a server. Useful for shrinking PNG screenshots into WebP or producing JPEGs that will open anywhere.
100% private — everything runs in your browser, nothing is ever uploaded.
What this tool does
A front-end developer exports a batch of PNG screenshots for a documentation site and then discovers the pages are slow because each one weighs 2 MB. Converting those screenshots to WebP typically cuts a quarter to a third of the bytes with no visible change, and every current browser renders WebP. This tool changes the container and codec of an image without changing what the picture shows, supporting WebP, JPEG and PNG in either direction and processing a whole selection at once. It is also the quick fix for compatibility problems: a printer that refuses WebP, an old editor that cannot open it, or a form that specifically asks for JPEG. Because the conversion uses the codecs your browser already ships with, there is no software to install and no account to create before a stack of files is ready to hand over.
How to use it in three steps
- Add the images that need a new format. Mixed input formats are fine; each file is converted independently with the target format you select.
- Choose the output format from the dropdown. WebP suits anything displayed on the web, JPEG suits email and older software, and PNG is the right choice when transparency must survive.
- Press Convert, then download the results one at a time or together. Check one file in the application that will consume it before you replace an entire batch. Convert one file first and open it in the target application before replacing a whole set of assets.
Questions people ask
Which format should I use for a website?
WebP is the practical default for web delivery: it is smaller than JPEG at comparable quality and is supported by all current browsers. Keep a JPEG copy for contexts where the file will be emailed, opened in older desktop software, or sent to a print service.
Will converting to PNG make a photograph smaller?
Usually the opposite. PNG is lossless, so a photograph saved from a JPEG as PNG often grows considerably. Use PNG for transparency, sharp edges, logos and diagrams, and use JPEG or WebP for photographs.
Can it open HEIC photos from an iPhone?
That depends on the browser rather than on this tool, because the conversion relies on the codecs the browser provides. Safari decodes HEIC directly; Chrome and Edge on Windows generally do not, so transfer those photos as JPEG first and then convert them here.
Will converting a PNG with transparency to JPEG keep the transparent area?
No. JPEG has no alpha channel, so transparent pixels are filled with a solid colour, usually white or black. Keep PNG or choose WebP when a logo, sticker or UI element must retain its transparent background.
Privacy: Format conversion uses your browser's built-in image codecs entirely in memory, so an unreleased screenshot or a confidential diagram is never transmitted, stored or seen by anyone but you.
How to use it
- Add the images you want to convert.
- Choose the output format from the dropdown.
- Press Convert and download the results.
Why it stays private
Format conversion uses your browser's own image codecs. Nothing is transmitted, so a confidential diagram or an unreleased screenshot stays exactly where it is.
Questions
Which format should I choose?
WebP is usually the best choice for the web — it is 25–35% smaller than JPEG at equivalent quality and every current browser supports it. Choose JPEG when you need maximum compatibility with older software or print pipelines. Choose PNG when you need transparency or lossless output.
Will I lose quality converting to JPEG?
Yes, JPEG is a lossy format. Each conversion re-encodes the image. If you need to convert the same file repeatedly, work from the original each time rather than from a previous JPEG.
Does converting to PNG reduce file size?
Usually not — PNG is lossless, so a PNG made from a JPEG will often be larger. PNG is the right choice for transparency and sharp-edged graphics, not for shrinking photos.
Can I convert HEIC photos from my iPhone?
That depends on your browser, not on this tool: the conversion uses the codecs your browser ships with. Safari can decode HEIC natively, so it converts directly. Chrome and Edge on Windows cannot, so those photos need converting to JPEG first — the Photos app on any iPhone does this the moment you transfer or share the picture. Once it is a JPEG, everything here works normally.
Is WebP safe to use everywhere now?
Every browser released in the last several years renders WebP, so for anything shown on the web it is safe. The remaining gaps are offline tools: some older image editors, printer drivers and Windows thumbnails choke on it. A practical habit is WebP for anything that lives on a website, JPEG for anything that has to survive being emailed or printed by other people.