Free Image Converter

JPG 転換 PNG 変換器

Convert JPG to PNG online in your browser. Create a PNG copy for screenshots, graphics, icons, and images that need crisp edges or lossless saving.

登録不要 バッチ変換 Files auto-deleted
Image conversion icon
JPG
Photo image
to
PNG
Lossless image

またはここにファイルをドロップしてください。最大ファイルサイズは1GBです。

変換するファイルを選択してください。

After uploading a JPG file, select PNG from the output format menu and start conversion.

なぜJPGをPNGに変換するのか?

JPG is excellent for photos, but PNG is better for screenshots, logos, interface images, line art, and graphics with text because it keeps edges sharp after saving.

PNGを使用して清潔な編集を行う

A PNG copy is useful when you need to edit an image repeatedly, place it in a design tool, or avoid another round of JPG compression while preparing web assets.

迅速な画像作業プロセスに専念

Use this JPG to PNG converter for product photos, social graphics, downloaded images, thumbnails, screenshots, and design assets up to 1 GB per file.

オンラインでJPGをPNGに変換する方法

  1. 1

    Upload your JPG or JPEG image file.

  2. 2

    Choose PNG as the output format and start the conversion.

  3. 3

    Download your PNG image when processing is complete.

よくある質問

Can I convert JPG to PNG online for free?

Yes. Upload a JPG or JPEG image, choose PNG as the output format, and download the converted PNG file for free with no registration.

Will converting JPG to PNG make the image transparent?

No. Converting a JPG to PNG preserves the visible image, but it cannot recreate transparency that was not in the original JPG file.

Does JPG to PNG conversion improve image quality?

PNG uses lossless compression, so the new PNG will not add extra JPG compression damage. It cannot restore detail already lost in the original JPG.

When should I use PNG instead of JPG?

Use PNG for screenshots, graphics with text, icons, UI images, drawings, and files that need crisp edges or repeated editing without new compression loss.

Can I convert multiple JPG files to PNG at once?

Yes. Add multiple JPG images, choose PNG as the target format, and convert them together. Each uploaded file can be up to 1 GB.

Are my JPG images private?

Files are processed securely and automatically deleted after conversion. Your images are not kept for long-term storage.

関連するイメージコンバーガンツール

画像コンバーター

Convert JPG, PNG, WEBP, HEIC, GIF, BMP, and more.

PNG 変換ツール

Start from the PNG format hub for more input and output options.

WEBP で PNG

Create PNG files from WebP images when you need broad editing support.

AVIF を PNG に変換する

Create a lossless PNG copy from AVIF for transparency and broader compatibility.

PNG から SVG

Trace PNG images into SVG vectors for logos, icons, and simple graphics.

WEBP ジプジ

Convert modern WebP images into widely compatible JPG files.

タフPNG

Create lossless PNG files from TIFF scans and archive images.

HEICからJPGへ

Turn iPhone HEIC photos into JPG files before creating PNG copies when needed.

BMP ジョージ

Batch convert large bitmap files to compressed JPG when transparency and lossless pixels are not required.

What happens when JPG becomes PNG

変換元フォーマット

JPG uses lossy compression and does not support transparency.

ターゲットフォーマット

PNG uses lossless compression and supports full transparency.

どんな変化

The JPG pixels are decoded and written using PNG compression and color capabilities.

何が保持されるか
Pixel dimensions and visible composition are preserved unless resize or crop settings are selected.
What may be lost
Layers, editable vectors, camera-raw controls, animation, high bit depth, and metadata are preserved only when PNG supports them.
Codec and quality implications
Writing PNG without further lossy compression avoids additional codec loss, but it does not restore detail discarded by the JPG encoding.
Realistic limitations
Multi-page, layered, animated, camera-raw, or very large images may be flattened, reduced to one frame, or rejected if the decoder cannot safely read them.

変換ステップ

  1. Upload a JPG file no larger than 1 GB.
  2. Confirm that PNG is selected as the target.
  3. Start the conversion. A healthy compatible worker begins processing immediately.
  4. Download the PNG file and check the result before deleting your source.

トラブル解決

The JPG file is rejected or will not open.
Confirm that the file is not empty, password-protected, or corrupt and that its real format matches the extension.
The PNG file is larger than expected.
Choose a more efficient codec or lower quality setting when available. Lossless and uncompressed targets are often larger by design.
Transparency, color, or animation changed.
Choose a target that supports the needed feature and keep the original file; JPG cannot store transparency or animation.

プライバシーとファイル保管

Uploads and converted files are processed automatically and irreversibly deleted within 24 hours. You can delete them sooner with the delete control. Convertr does not read, mine, sell, or manually review file contents.

Read the privacy policy

役に立つ選択肢

JPG to AVIF Use this when AVIF better matches the app, codec, or editing workflow you need. JPG to BMP Use this when BMP better matches the app, codec, or editing workflow you need. PNG to JPG Use the reverse conversion when you need to return to the original format family.