A 10 MB PNG typically becomes 400 KB – 1.4 MB as JPG at quality 85.
Quality: Lossy — invisible on photos at quality 80+, but creates visible artifacts on text, sharp edges, and screenshots.
Heads up: JPG doesn't support transparency, so transparent backgrounds in your PNG will be flattened (usually to white).
Best for: photos, web images, email attachments, social media uploads.
Avoid when: image has transparency (alpha channel) or contains text/UI/diagrams that need crisp edges.
Tip: For mixed content (photo with text overlay), keep PNG. For pure photos, JPG quality 85 is virtually indistinguishable from the original.
Real use case
PNG to JPG — The lossless-to-lossy conversion — cut file size for uploads
PNG → JPG shrinks file size dramatically for photographic content — often 70-85% smaller. The classic use: a screenshot or exported design file that's too large for a portal upload cap, or a photo saved as PNG by accident (some phone screenshots, some scanner defaults). Downside: loses any transparency (transparent pixels become white), and re-editing after the conversion accumulates JPG compression artefacts.
About the output format
When JPG is the right output
JPG is the default format for photographs — 24-bit colour, lossy compression tuned for continuous-tone imagery, universally supported. Ubiquity is its main strength: government portals, e-commerce marketplaces, print labs, and CMS uploaders that don't say what format they want will accept JPG. The trade-offs: no transparency, no lossless option, compression artefacts around sharp edges (text, logos). Use JPG when the source is a photograph and the destination doesn't require a transparent background.
Why PNG-to-JPG changes more than the extension
PNG stores pixels losslessly with DEFLATE compression — every pixel survives the round trip unchanged. JPG uses lossy DCT compression that permanently discards high-frequency color information the eye is least sensitive to. The conversion decompresses the PNG, flattens any alpha channel onto a white background (JPG has no transparency), and re-encodes with the JPG algorithm. At quality 85, a PNG screenshot that was 2 MB typically becomes 150-400 KB as JPG with no visible difference in body text or UI elements. Gradients and smooth color transitions are where JPG artifacts first appear.
When to convert PNG to JPG
Convert when file size matters more than pixel-perfect fidelity: email attachments, social media uploads, web pages where bandwidth matters, or any platform with a file-size cap. Keep PNG when you need transparency, when the image will be edited further (each JPG save degrades quality), or when the image is line art or text where JPG blocking artifacts would be visible.
PNG vs JPG: Side-by-side
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
Property
PNG
JPG
Full name
Portable Network Graphics
JPEG (Joint Photographic Experts Group)
Year introduced
1996
1992
Developer / standard body
PNG Development Group / W3C
JPEG Committee
MIME type
image/png
image/jpeg
File extension
.png
.jpg / .jpeg
Compression
Lossless (DEFLATE)
Lossy (DCT-based)
Color / data depth
24-bit truecolor + 8-bit alpha
24-bit truecolor
Max dimensions / size
2,147,483,647 × 2,147,483,647 px
65,535 × 65,535 px
Transparency
Yes
No
Animation
APNG extension only
No
Standard / specification
W3C / ISO/IEC 15948
ISO/IEC 10918
Best for
Logos, screenshots, graphics with transparency or sharp edges
Photos, web images, email attachments
About the PNG Format
PNG (Portable Network Graphics) is a lossless image format created in 1996 as a patent-free replacement for GIF. It uses DEFLATE lossless compression, meaning every pixel is preserved exactly as intended — no visual information is discarded during encoding. PNG was developed by the web community and standardized by the W3C and ISO, making it one of the most trusted and universally supported image formats available.
PNG is best suited for screenshots, graphics, logos, and any image that requires transparency. Its support for a full alpha channel allows smooth, semi-transparent edges that blend seamlessly with any background. The main trade-off is file size — PNG files are significantly larger than JPEG for photographic content because no visual data is discarded. PNG does not natively support animation; for animated sequences, APNG (Animated Portable Network Graphics) serves as its extension.
PNG to JPG FAQ
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert PNG files to JPG.
How do I convert PNG to JPG online?
Upload your PNG image to iFormat and click Convert — it's decoded and re-encoded to JPG in seconds. It's free, adds no watermark, and needs no account. Batch upload is supported, and results download individually or as a ZIP.
Can I convert PNG to JPG without losing quality?
JPG is a lossy raster format. When JPG is lossless (PNG, TIFF, BMP), every pixel is preserved exactly. When it's lossy (JPG, WebP), iFormat uses a high default quality so the difference is invisible at normal viewing size. For the sharpest result, always convert from the highest-quality source you have.
How to batch convert PNG files to JPG for free
Upload multiple PNG files at once — iFormat converts them all to JPG in one batch. Each result downloads individually or as a single ZIP. No sign-up, no watermark, and no per-file limit on the free plan beyond the 50 MB per-file cap.
Does converting PNG to JPG keep transparency?
If both formats support an alpha channel (PNG, WebP, GIF, TIFF), transparency carries over. When the target lacks transparency (like JPG), transparent areas are flattened onto a solid background rather than lost silently — preview the result before you rely on it.
Can I convert PNG to JPG on my phone without installing an app?
Yes. iFormat runs entirely in your browser on iPhone, Android, iPad, or any mobile device — no app download needed. Upload your PNG photo, tap Convert, and save the JPG directly to your camera roll or files.
PNG vs JPG — which format should I use?
PNG is a lossless format with transparency support best for logos, screenshots, and graphics with sharp edges. JPG is a lossy raster format best for photos and web images where small size matters. Use JPG when a website, form, or app requires it, or when you need JPG's specific strengths like smaller file size, wider compatibility, or transparency support.
Is it safe to convert PNG to JPG online?
Yes. Uploads travel over an encrypted HTTPS connection, conversion runs on an isolated worker, and both your PNG source and the JPG result are automatically deleted from our servers within a short window. Nothing is stored, shared, or used for training.
Is there a file size limit for PNG to JPG conversion?
The free plan supports files up to 50 MB, which covers the large majority of PNG files. For longer or higher-resolution files, Starter raises the limit to 100 MB, Plus to 1 GB, and Pro to 5 GB.
Why does my PNG with transparency become a white background after converting to JPG?
JPG does not support transparency. When the converter flattens a transparent PNG, it fills the see-through areas with a solid color — white by default. To keep transparency, convert to WebP or keep the file as PNG.
How much smaller will my PNG become as a JPG?
For photos, expect a 60–90% reduction in file size. A 10 MB PNG photograph typically becomes 400 KB – 1.4 MB as JPG at quality 85. For screenshots, logos, and graphics with limited colors, the reduction is much smaller — and the quality loss is more visible.
Will my photo look worse after PNG to JPG conversion?
At quality 85 or higher, the difference is virtually invisible on photographs. JPG's compression is optimized for natural images. The conversion does become visible on text, UI screenshots, line art, and any image with sharp edges — for those, stay with PNG.
Should I use PNG or JPG for screenshots?
PNG. Screenshots typically contain text, UI elements, and sharp color boundaries — exactly what JPG compresses poorly. PNG keeps every pixel exact, and screenshots compress well in PNG's lossless DEFLATE algorithm.
