Switch formats with honest warnings about transparency and quality — no server round-trip.
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Select one or more images.
Choose the target format; consequences (like losing transparency in JPEG) are shown before converting.
Pick a background color if converting transparency to JPEG.
Convert and download individually or as a ZIP.
Every output is re-decoded to confirm it parses as the target format with the expected dimensions; failures are isolated per file.
JPEG is smallest for photos without transparency. PNG is lossless and keeps transparency, best for UI screenshots. WebP usually beats JPEG at the same quality and supports transparency — a good default when your destination supports it.
No. The file is opened with your browser's File API and processed by code running in your tab. You can confirm this yourself: open your browser's developer tools, watch the Network panel, and process a file — no request carries your file's bytes. See our How it works page for a step-by-step verification guide.
The same local tool, preconfigured for a specific job.
Technical guidance, limitations, and safer workflows related to this tool.
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Quality slider and target-size search with side-by-side comparison. Metadata is stripped by default.
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