By MiniCrafts · Updated
A logo can look correct in one preview and appear inside a white or black rectangle after conversion. First check whether its background is actually transparent. A white rectangle already stored in a photograph is ordinary image content; exporting that photograph as PNG does not remove it.
Choose the output for the destination
- PNG: keeps transparent pixels and encodes the decoded pixels without JPEG-style quality loss. Detailed photographs can produce large PNG files.
- WebP: supports transparent pixels and a quality setting. Compare fine text and edges after encoding, and confirm the destination accepts WebP.
- JPEG/JPG: cannot store transparency. MiniCrafts fills transparent areas with the white or black background you select before encoding.
These are output choices, not a ranking of every image. Converting a small JPEG to PNG does not restore detail previously lost to JPEG compression. A file with a .png name may contain a completely opaque image.
A repeatable comparison using your own non-sensitive test image
Use a small PNG logo or drawing that you know has transparent areas. Keep the original. You do not need to send it to us: Convert runs in the browser's local editor.
- Open Convert and choose the transparent PNG. Leave optional dimensions empty and do not crop.
- Export as PNG. Check the preview, then download and check that transparent areas remain transparent in an editor or on a contrasting page background.
- Return to the original PNG and export as JPEG with a white background. The transparent areas now become white pixels.
- Repeat from the original with a black JPEG background. Check the edges as well as the empty areas; pale halos that blend into white can become visible against black.
Always compare exports from the original. Reopening the white-background JPEG and exporting it as PNG keeps the white rectangle: the transparency was already discarded. A checkerboard can help identify transparency in an editor, but a checkerboard drawn into the source itself is also just ordinary pixels.
When a JPEG-only upload form is the destination
Pick the background that matches the required use, confirm that small text remains readable, and check the actual output dimensions and bytes. JPEG is often appropriate for an opaque photograph; for a logo with sharp edges, its compression can introduce ringing around text. Raising quality may improve those edges while increasing file size.
If the form specifies a strict byte limit, use Compress and verify its Fits limit result. The displayed KB value is rounded; the check uses actual bytes. A destination can still reject a file for its dimensions, content or its own validation rules.
What this converter does not do
- It does not remove an opaque background or reconstruct transparency from JPEG.
- It does not support every format or preserve animation. The supported inputs are JPEG, PNG and WebP.
- It re-encodes browser-decoded pixels rather than preserving the original file and its embedded metadata. Keep an untouched source if metadata or color-profile fidelity matters.
- PNG compression has no quality slider here. If a PNG exceeds your limit, changing JPEG quality settings will not make that PNG smaller; review its dimensions or choose an accepted alternative format.
Before submitting, inspect the downloaded file on a contrasting background, verify its extension and dimensions, and select that exported file in the destination form. For the separate format, pixel and byte checks, follow the image-upload checklist.
Report a mismatch with the page URL, browser and settings to yunfeng2003@hotmail.com. Do not send a personal photo.