PNG files are lossless and crisp — and often five to ten times larger than they need to be. When a form rejects your upload, an email bounces, or a page loads slowly, converting PNG to JPG is usually the one-minute fix. Here's how to do it properly.
Convert PNG to JPG in 3 steps
Open Convert Image — free, no signup, runs entirely in your browser.
Drop in up to 20 PNG files (max 20MB each).
Choose JPG as output, set quality (85–92% is the sweet spot), and click Convert. Download files individually or as a ZIP.
Your images are processed locally with the Canvas API — nothing is uploaded, which matters when converting screenshots with personal data.
When should you convert PNG to JPG?
Photos saved as PNG. Cameras and screenshots sometimes produce PNGs of photographic content — JPG stores the same visual quality in a fraction of the size.
Upload limits. Job portals, government forms, and marketplaces often cap files at 1–2MB or accept JPG only.
Email and messaging. Smaller attachments send faster and don't bounce.
Web performance. Smaller images mean faster pages and better Core Web Vitals.
When you should NOT convert
Logos, icons, UI elements with sharp edges — JPG compression blurs hard edges and text. Keep those as PNG, or convert to WebP instead.
Images that need transparency — JPG has no alpha channel. Transparent areas will be filled with a solid color (NanoImage lets you pick which; white is the default).
Files you'll keep editing — re-saving JPG repeatedly compounds compression artifacts. Edit in PNG, export JPG once at the end.
Keeping quality high
JPG is lossy, but at quality 85+ the difference from PNG is invisible for photos. Practical settings:
Quality 90–92: portfolio images, product photos
Quality 80–85: blog images, social posts — best size/quality balance
Quality 70: thumbnails and previews
Need to hit an exact file size such as 200KB for a form? Convert first, then use Compress Image to 200KB — it automatically finds the highest quality that fits the limit.
What about transparency?
JPG cannot store transparent pixels. During conversion, transparent regions get a background color. If your PNG has a transparent background you want to keep, your options are: keep PNG, convert to WebP (smaller and supports alpha), or add a background color deliberately with Change Background first.
Batch conversion
Converting one file is easy anywhere; converting fifty is where tools differ. NanoImage handles up to 20 files per batch in the browser, and the NanoImage CLI converts entire folders from the terminal: `nanoimage convert ./screenshots --to jpg --output ./jpg`.
FAQ
Does converting PNG to JPG lose quality?
Technically yes (JPG is lossy), visibly no at quality 85+ for photographic content. Line art and text suffer most — keep those as PNG.
Why is my JPG bigger than the PNG?
For flat-color graphics (charts, screenshots of text), PNG compresses better than JPG. Convert those to WebP or leave them as PNG.
Is it safe to convert sensitive screenshots online?
Only if the tool doesn't upload them. NanoImage converts locally in your browser — verify with your browser's network tab.
More conversion tools
Explore convert image formats online: Convert Image, Convert to WebP, and Image to PDF. Then compress images online if the platform has a size cap.