HEIC vs JPG vs PNG vs WebP: Which Image Format Should You Use?

Someone asked me this week which image format they should use for their website. I gave the short answer: “WebP for photos, PNG for screenshots, SVG for icons.” Then they asked about HEIC, AVIF, JPEG XL, and the conversation turned into an hour-long discussion.

Image formats shouldn’t be this confusing, but here we are with more options than ever. Let me break it down based on actual production experience, not theoretical benchmarks.

The Quick Decision Tree

Before we get into details, here’s the decision tree I use daily:

Is it a photograph?
├── Yes → Is it for the web?
│   ├── Yes → WebP (quality 80)
│   └── No → JPEG (quality 85-90)
└── No → Does it need transparency?
    ├── Yes → PNG (or WebP if browser support is fine)
    └── No → Is it a vector (icon/logo)?
        ├── Yes → SVG
        └── No → PNG

That handles 95% of real-world decisions. The remaining 5% is where things get interesting.

JPEG: The Reliable Workhorse

Created: 1992 | Extension: .jpg, .jpeg | Compression: Lossy | Transparency: No

JPEG has been the default photograph format for three decades, and it earned that position. It’s universally supported — every browser, every email client, every image viewer on every operating system opens JPEG without question. There’s zero compatibility risk.

Strengths:

• Universal compatibility — literally everything supports it
• Excellent compression for photographs
• Adjustable quality from 1-100
• Small file sizes at quality 80-85

Weaknesses:

• No transparency support — opaque only
• Lossy only — each save degrades quality slightly
• No animation support
• Visible artifacts at low quality (blocky patterns around edges)

When I use JPEG: Email attachments, print files, any context where the recipient’s software is unknown, and legacy systems that don’t support WebP. Quality 85 is my default; below 75 artifacts become noticeable on most photos.

PNG: Pixel-Perfect Precision

Created: 1996 | Extension: .png | Compression: Lossless | Transparency: Yes (alpha channel)

PNG preserves every single pixel exactly as it is. No compression artifacts, no quality loss, no generational degradation. The trade-off is file size — PNGs are typically 5-10x larger than equivalent JPEGs for photographs.

Strengths:

• Lossless — zero quality loss
• Full alpha transparency
• Perfect for sharp edges, text, UI elements
• No generational quality loss (safe to edit and re-save)

Weaknesses:

• Large file sizes for photographs
• No lossy mode (can’t trade quality for size)
• No animation (APNG exists but isn’t widely supported)

When I use PNG: Screenshots (text must stay crisp), images with transparency (logos on various backgrounds), graphics with sharp edges (UI mockups, diagrams), and any image I’ll need to edit multiple times (no generational loss).

The biggest PNG mistake I see: using PNG for photographs. I reviewed a client’s website where every product photo was PNG. The homepage loaded 28MB of images. Converting to WebP quality 80 dropped it to 2.1MB with no visible difference. That’s a 93% reduction.

WebP: The Modern Default

Created: 2010 (Google) | Extension: .webp | Compression: Lossy and Lossless | Transparency: Yes

WebP is what JPEG should’ve evolved into. It supports both lossy and lossless compression, alpha transparency, and animation — all in a single format. In 2026, browser support is effectively universal (Chrome, Firefox, Safari, Edge all support it).

Strengths:

• 25-35% smaller than JPEG at equivalent quality (lossy)
• 26% smaller than PNG (lossless)
• Alpha transparency support
• Animation support (lighter than GIF)
• Universal browser support as of 2026

Weaknesses:

• Not universally supported in non-browser software (some image editors, email clients)
• Slightly slower encoding than JPEG
• Adoption still lower than JPEG/PNG in non-web contexts

When I use WebP: Every image on a website. Period. I generate WebP as the primary format with JPEG as a fallback for the rare edge case. The file size savings compound across a site — if you have 50 images per page, 30% savings per image is a massive performance win.

Convert to WebP: The Image Format Converter converts PNG, JPEG, AVIF, and BMP to WebP in your browser. Adjust quality and preview the result before downloading.

HEIC: Apple’s Efficient Format

Created: 2017 (adopted by Apple) | Extension: .heic, .heif | Compression: Lossy (HEVC-based) | Transparency: Yes

HEIC is what your iPhone uses by default since iOS 11. It produces files roughly 50% smaller than JPEG at equivalent quality — impressive compression thanks to the HEVC (H.265) video codec adapted for still images. It also supports features JPEG can’t: 16-bit color depth, depth maps, Live Photos, and burst sequences in a single file.

Strengths:

• ~50% smaller than JPEG at equivalent quality
• 16-bit color depth
• Multiple images in one file (Live Photos, bursts)
• Depth map support (Portrait Mode)

Weaknesses:

• Not web-compatible — no browser renders HEIC natively
• Windows support is limited (requires a paid codec or free extension)
• Many web platforms can’t accept HEIC uploads
• Editing software support is inconsistent

When HEIC is the right choice: On your iPhone. That’s basically it. HEIC saves storage space on your phone, which is its primary purpose. The moment you need to share outside the Apple ecosystem, convert to JPEG or WebP.

Convert HEIC files: The HEIC to JPG/PNG Converter handles batch conversion entirely in your browser. No upload, no server — your photos stay on your device.

AVIF: The Cutting Edge

Created: 2019 (Alliance for Open Media) | Extension: .avif | Compression: Lossy and Lossless | Transparency: Yes

AVIF is based on the AV1 video codec and offers the best compression ratios available today — roughly 50% smaller than JPEG and 20% smaller than WebP at equivalent quality. It’s the format to watch.

Strengths:

• Best-in-class compression (50% smaller than JPEG)
• 10-bit and 12-bit color depth
• HDR support
• Wide color gamut (BT.2020)

Weaknesses:

• Slow encoding — 10-100x slower than JPEG or WebP encoding
• Browser support is good but not quite universal (Safari added support relatively recently)
• Not supported in most non-browser software
• Decoding is more CPU-intensive

When I use AVIF: High-traffic pages where every KB matters and I have time to pre-encode (static sites, CDN-served assets). I always include a WebP fallback:

<picture>
  <source srcset="photo.avif" type="image/avif">
  <source srcset="photo.webp" type="image/webp">
  <img src="photo.jpg" alt="Description">
</picture>

Head-to-Head: Real File Size Comparison

I ran the same 12-megapixel photograph through each format at roughly equivalent visual quality:

For a screenshot (1920x1080 with text and UI elements):

The takeaway: WebP is the clear winner for web use in 2026. AVIF edges it out on compression but the encoding speed penalty and slightly lower compatibility make it situational. JPEG remains king for universal compatibility. PNG is for when quality cannot be compromised.

The Format I’d Choose for Each Scenario

Further Reading

• The Complete Guide to Browser-Based Image Editing
• Image Optimization for the Web
• SVG Optimization Guide

Need to convert between formats? The Image Format Converter handles PNG, JPEG, WebP, AVIF, and BMP conversions. For Apple HEIC files, use the HEIC Converter. Both run 100% in your browser.