How to Convert PNG to JPG Free Online (3 Easy Ways)

PNG and JPG are the two most common image formats, but they are designed for different purposes — and using the wrong one results in files that are larger than they need to be, or images that lose their transparent backgrounds when you did not want them to. This guide covers when and why to convert PNG to JPG, and three ways to do it for free.

PNG vs JPG — why it matters

Understanding the difference will help you decide whether you actually need to convert.

PNG (Portable Network Graphics) uses lossless compression. Every pixel is stored exactly — no quality is lost during compression, and the file can be opened and re-saved indefinitely without degrading. PNG also supports transparent backgrounds (alpha channel), which makes it the correct format for logos, icons, screenshots, and any image that needs to sit on a coloured background without a white box around it.

JPG (JPEG) uses lossy compression. The algorithm analyses nearby pixels and discards data that is hard for the human eye to detect — this typically achieves 5–10× smaller file sizes than PNG for photographic content. The trade-off: opening and re-saving a JPG at anything less than 100% quality degrades it slightly each time, and JPG does not support transparency at all.

When to convert PNG to JPG:

• The image is a photograph and the PNG file is very large
• You are uploading images to a website and page speed matters
• The image does not have a transparent background that you need to preserve
• You are sending images by email and need to reduce the attachment size

When NOT to convert:

• The image has a transparent background (logos, icons, stickers) — JPG will fill it with white
• The image contains text, diagrams, or screenshots — JPG's compression blurs edges and creates artefacts around sharp lines
• You need to edit and re-save the file multiple times — keep PNG for editing, export JPG only for the final version

Method 1 — Online tool (fastest, works on any device)

The fastest way to convert PNG to JPG on any device — Windows, Mac, iPhone, Android — is a browser-based converter. No installation, no account, no waiting.

1. Go to criply.co/image/png-to-jpg
2. Upload your PNG files — drag and drop or click to browse. You can upload up to 20 files at once for batch conversion.
3. Adjust the quality slider if needed. The default (90) gives excellent visual quality with a meaningful file size reduction. Drop to 75–80 for web thumbnails. Use 95–100 if you need near-lossless output.
4. Download the converted files individually or click "Download all as ZIP" for batch results.

The conversion runs in your browser — no file is uploaded to a server. This makes it suitable for any image, including private or confidential documents.

Quality setting guide:

• 95–100: Near-lossless. For professional photography or print work where quality is the priority.
• 85–90 (default): Excellent quality for most uses. Social media, presentations, email attachments.
• 70–80: Smaller files, minimal visible degradation. Website thumbnails, background images.
• 50–65: Noticeable compression at full zoom. Only use this when file size is the top priority and quality is not.

Method 2 — Windows Paint

If you prefer not to use an online tool, Windows Paint handles PNG to JPG conversion with no extra software needed:

1. Right-click the PNG file in File Explorer and select Open with → Paint.
2. In Paint, click File → Save as → JPEG picture.
3. Choose a save location and click Save.

Limitations: Paint does not let you adjust the output quality level, it processes one file at a time, and the quality it uses is fixed at its own internal setting (which is decent but not configurable). For batch conversion or quality control, the online method is better.

Method 3 — Mac Preview

On macOS, Preview handles image format conversion natively:

1. Open the PNG file in Preview (double-click it, or right-click and choose Open With → Preview).
2. Click File → Export.
3. In the Format dropdown, choose JPEG.
4. Use the Quality slider to set the output quality (0–100%).
5. Click Save.

Preview also supports batch conversion via Automator (a built-in macOS tool), but the setup is more complex. For most users, the online tool is faster even on Mac.

What to do after converting

Once you have your JPG files, two follow-up tools are often useful:

• Compress the image further — if the JPG is still larger than you need, a compression pass can reduce it another 20–40% with no visible quality loss.
• Resize the image — if you need specific pixel dimensions for a website, social profile, or document, resize after converting to keep the workflow clean.

Converting from PNG to JPG typically reduces file size by 60–80% for photographic images. A 4 MB PNG photo will often become a 600 KB–1 MB JPG at 90% quality — a dramatic improvement for anything that will be served over the web or sent as an email attachment.

Frequently asked questions

Will the image lose quality when I convert PNG to JPG?
At a quality setting of 85 or higher, the quality difference is not visible in normal use. If you inspect individual pixels at 200% zoom, you may see slight differences near edges — this is the nature of JPG compression. For screen viewing and web use, the difference is imperceptible.

Can I convert JPG back to PNG after converting?
You can, but the file will not recover the quality lost during JPG compression. Converting JPG → PNG gives you a larger file with the same slight quality loss as the JPG — it does not undo the lossy compression.

What happens to the transparent background?
Transparent areas in a PNG are filled with white when converted to JPG. JPG does not support transparency. If preserving transparency is important, keep the file as PNG.