JPG vs PNG vs WEBP: Which Format Should You Use?
Three formats dominate the modern web, and each one is best at something different. This guide unpacks the differences, shows when each shines, and gives you a decision rule you can apply in five seconds.
The Quick Answer
If you only read one paragraph of this article: use WEBP when you can (modern browsers, full size savings). Fall back to JPEG for photographs when WEBP isn't an option, and use PNG for anything with transparency, sharp edges, or text.
JPEG (also called JPG)
JPEG is the elder statesman of web images — born in 1992, universally supported, and still the most-used image format on the internet.
How It Works
JPEG uses lossy compression based on the Discrete Cosine Transform. It breaks the image into 8×8-pixel blocks, converts each block into frequency data, and discards high-frequency detail that the human eye is poor at perceiving.
When to Use JPEG
- Photographs with gradual color transitions (landscapes, portraits, lifestyle shots)
- Complex scenes where artifacts blend into the noise
- Situations where you need maximum compatibility (ancient browsers, embedded devices)
- Email attachments where recipient software might not support WEBP
When NOT to Use JPEG
- Images needing transparency — JPEG doesn't support alpha channels
- Graphics with sharp edges or solid color areas — JPEG produces visible "ringing" artifacts
- Text inside images — letters get fuzzy and ugly
- Images you'll edit repeatedly — each save degrades quality further
PNG
PNG (Portable Network Graphics) arrived in 1996 as a free alternative to the then-patented GIF. It's losslessly compressed, supports transparency, and handles sharp-edged graphics beautifully.
How It Works
PNG uses the DEFLATE algorithm (the same one in ZIP files) combined with filtering steps that predict pixel values based on neighbors. It's fully lossless — the decompressed image is bit-for-bit identical to the original.
When to Use PNG
- Images requiring transparency (logos on colored backgrounds, UI elements, overlays)
- Screenshots — pixel-perfect text and UI chrome
- Graphics, illustrations, and icons with solid colors
- Images with embedded text that must stay sharp
- Any image you plan to edit further and re-export
When NOT to Use PNG
- Photographs — file sizes are often 5–10× larger than equivalent JPEG
- Any case where WEBP-lossless is available (WEBP typically beats PNG by 20–35%)
WEBP
WEBP is Google's 2010 answer to "what if we redesigned JPEG for modern needs?" It's now supported in every major browser (Chrome, Firefox, Safari 14+, Edge, Opera) and by every modern graphics tool.
How It Works
WEBP offers both lossy and lossless modes. Lossy WEBP uses predictive coding borrowed from the VP8 video codec — it predicts each block from neighboring blocks and only stores the difference. Lossless WEBP uses a more sophisticated version of DEFLATE with custom entropy coding.
When to Use WEBP
- Almost always — it produces smaller files than JPEG (25–35% typically) and PNG (20–35%) at equivalent quality
- Both photographs (lossy WEBP) and graphics (lossless WEBP) work well
- Animated images — WEBP does animation, replacing GIF with far smaller files
- Images with transparency — lossy WEBP is much smaller than PNG
When NOT to Use WEBP
- Email — many email clients (especially corporate Outlook) still don't render WEBP
- Legacy systems — some CMSes, photo frames, or embedded devices don't understand it yet
- Situations where recipients will download and open files locally (double-check their tools support WEBP)
Head-to-Head Comparison
Photograph (landscape, 2000×1200)
- JPEG quality 85: 480 KB, looks great
- PNG: 4.8 MB, same visual quality, impractical size
- WEBP quality 80: 290 KB, indistinguishable from JPEG but 40% smaller
Logo on Transparent Background (512×512)
- JPEG: cannot do transparency — not an option
- PNG: 28 KB, sharp and clean
- WEBP lossless: 18 KB, identical appearance
Screenshot of a Web Page (1920×1080)
- JPEG: 220 KB, but text looks fuzzy
- PNG: 180 KB, text is crisp
- WEBP lossless: 130 KB, crisp text AND smaller file
Browser and App Support
As of 2026:
- JPEG and PNG: universal support, everywhere, every browser and app
- WEBP: supported by all modern browsers and most modern apps. The notable holdouts are older email clients and a few specialized image viewers.
If your audience is the general web-browsing public, WEBP is safe. If you're sending images to clients via email or for use in older publishing workflows, JPEG/PNG remain the safer choice.
A Simple Decision Rule
Ask these three questions in order:
- Does the image need transparency? → Yes → WEBP (or PNG if WEBP isn't supported)
- Is it a graphic with sharp edges, text, or solid colors? → Yes → PNG (or WEBP lossless)
- It's a photograph → WEBP lossy (or JPEG as fallback)
Converting Between Formats
Our free Image Converter handles all the common conversions in your browser with no upload. A few practical notes:
- Converting JPEG → PNG won't restore lost detail — it just wraps the JPEG artifacts in a lossless file. You'll get a bigger file with the same visual quality.
- Converting PNG → JPEG will lose transparency (transparent pixels become a flat color you choose).
- Converting to WEBP is almost always a win if your end destination supports WEBP.
What About AVIF and HEIC?
AVIF (2019) and HEIC (2015) are even newer formats that often beat WEBP on compression. However:
- AVIF: impressive compression but still-growing browser support and slower encoding. A good choice for large photo libraries where encoding time isn't critical.
- HEIC: native on Apple devices but not universally supported on the web. Good for personal archives; bad for web delivery.
For now, WEBP is the practical sweet spot. AVIF will likely be worth revisiting in another year or two as ecosystem support matures.
Wrapping Up
Most websites should default to WEBP for photos and graphics, with PNG fallbacks for complex transparency work and JPEG fallbacks for email and legacy systems. A good compressor and converter are all you need to apply this consistently.