Image Format Converter
Convert images to PNG, JPEG, or WebP locally.
Image Format Converter turns browser-supported images into PNG, JPEG, or WebP entirely on-device. Pick an output type and quality, get clear errors for unsupported formats, and download the result without uploading.
How it works
Load a local JPEG, PNG, WebP, or GIF, choose the target MIME type, and export via Canvas. WebP encoding is probed first so unsupported browsers get an explicit message instead of a broken file.
Benefits
- PNG / JPEG / WebP output
- Clear unsupported-format errors
- Quality control for lossy formats
- Fully offline after first load
Use cases
- Convert screenshots to PNG for docs
- Export photos as JPEG for email
- Produce WebP assets for modern sites
- Normalize mixed format uploads locally
Best practices
- Use PNG for graphics with sharp edges
- Use JPEG/WebP for photographs
- Keep a master original before lossy export
- Verify WebP support before shipping assets
Common mistakes
- Expecting GIF animation to survive conversion
- Using very low JPEG quality for text screenshots
- Assuming every browser encodes WebP
- Ignoring alpha: JPEG cannot keep transparency
Privacy
Pixels never leave your device. ToolHub does not receive converted files. Prefer private browsing on shared computers.
Frequently asked questions
- Which formats can I convert between?
- Input: JPEG, PNG, WebP, and GIF (still frame). Output: PNG, JPEG, and WebP when your browser supports encoding that type.
- What happens with unsupported formats?
- You see a clear error—for example if the file type is not accepted, decoding fails, or WebP encoding is unavailable. The tool never silently invents a format.
- Is conversion lossless?
- PNG output preserves pixels from the decoded bitmap. JPEG and WebP are lossy; quality controls how much detail is kept.
- Are files uploaded?
- No. Conversion uses Canvas.toBlob entirely in your browser.
- Why might WebP fail?
- Some older browsers decode WebP but cannot encode it. The tool probes support and asks you to pick PNG or JPEG instead.
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