Comparison 2026

JPEG, PNG, WebP: which format compresses best for your use?

WebP isn't always the lightest format. It depends what you're compressing. And that's where most guides get it wrong. Here are the real rules, with concrete cases where each format wins.

8 min read JPEG, PNG, WebP: which format to choose?

En résumé

WebP offers the best web compromise: 25 to 35% lighter than JPEG at equivalent quality, with transparency support. JPEG remains the safe choice for universal compatibility. PNG is for logos and illustrations with transparent background. AVIF compresses even better but its browser support reaches ~94% in 2026.

✓Meilleur choix : WebP: best weight/quality ratio for the web in 2026
✗À éviter : PNG for photos: unnecessarily heavy with no visible benefit

JPEG: the universal photo format

Déf

JPEG

Lossy compression format created by the Joint Photographic Experts Group in 1992. It works by reducing details the human eye perceives poorly: especially color shifts in uniform zones.

Aussi appelé : JPG (equivalent extension)

Ex : A beach photo at JPEG 80% quality weighs about 3 to 5 times less than PNG, for visually identical results at standard display.

JPEG remains the most compatible format that exists. All browsers, all applications, all cameras read it. Its principle: sacrifice imperceptible data to reduce weight.

In practice, it’s the right choice for:

Natural photos (portraits, landscapes, products)
Images with lots of gradients or textures
Any context where universal compatibility matters more than weight

Its main limit: lossy compression leaves visible artifacts if you push the compression ratio too far. And it doesn’t handle transparency, a white background in a JPEG is opaque white, not transparent.

PNG: when transparency comes first

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PNG

Lossless compression format (Portable Network Graphics) that preserves every pixel identically. Supports transparency via alpha channel.

Aussi appelé : PNG-8 (256 colors), PNG-24 (16 million colors with alpha)

Ex : A logo with transparent background exported as PNG-24 keeps exactly its colors and borders, even after recompression.

PNG loses no data on compression. Which makes it the best choice for logos, icons, text-bearing screenshots, and anything needing transparent background.

Its problem: photos in PNG are massive. A 2 MB JPEG photo can exceed 10 MB in PNG. Lossless compression doesn’t change a photo’s information density — it just archives it without erasing anything.

Frequent mistake

Using PNG for product photos on e-commerce because “it’s higher quality”. In practice, JPEG at 85% quality gives visually identical results for 5 to 8 times less weight.

PNG is only relevant when you need transparency or pixel-perfect fidelity (infographics, text-bearing screenshots, diagrams with readable text).

WebP: the successor, not yet perfect

Déf

WebP

Format developed by Google in 2010, designed to replace JPEG and PNG on the web. Supports lossy and lossless compression, transparency, and animation.

Aussi appelé : Successor to JPEG and PNG

Ex : A 200 KB JPEG photo converted to WebP at equivalent quality typically weighs between 130 and 160 KB.

WebP is now supported by ~96% of browsers per caniuse.com (May 2026), including Chrome, Firefox, Safari (since 2020) and Edge. For most web projects in 2026, the absence of fallback is no longer necessary.

Its concrete advantage: 25 to 35% lighter than JPEG at equivalent quality on photos. On graphics with solid colors, it approaches lossless PNG while being significantly more compact.

❌ Idée reçue

WebP is always lighter than JPEG.

✅ Réalité

Not systematically. On some images (especially highly detailed photos with digital noise, or already high-quality JPEG) the gain can be marginal or even zero. WebP compression is particularly efficient on uniform zones and gradients.

Source : Squoosh tests / Google Developers WebP documentation

In practice, WebP suits the vast majority of web images. But if you convert a photo already compressed at JPEG 90%, you might get a WebP file barely lighter — or the same size.

AVIF: more efficient, adoption underway

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AVIF

Image format derived from the AV1 video codec, developed by the Alliance for Open Media. Offers compression superior to WebP, particularly efficient on gradients and low-contrast zones.

Aussi appelé : AV1 Image File Format

Ex : A photo compressed to AVIF at visually equivalent quality typically weighs 20 to 30% less than WebP, the gain is more marked on uniform zones and gradients.

AVIF is technically superior to WebP on almost all compression metrics. 2026 benchmarks document gains of 20 to 30% over WebP at equivalent quality, more on photos with uniform zones and gradients, less on highly detailed or already-compressed images. Google, Netflix and many CDNs have adopted it for their images.

Adoption is progressing: Chrome supports it since version 85 (2020), Firefox since version 93 (2021), Safari since version 16 (2022). In 2026, browser coverage reaches ~94% per caniuse.com.

Its real limits:

Slow encoding: generating an AVIF file takes more CPU time than WebP or JPEG. On a dynamic image flow, that’s a real server cost.
Tool support: some editing software and CMS don’t yet natively read or export AVIF.
Platform compatibility: social networks, emails, and some file readers don’t yet recognize AVIF. For these uses, JPEG remains the norm.

AVIF is excellent for websites with numerous images and high traffic flow. For a standard blog or brochure site, WebP remains simpler to deploy.

WebP vs AVIF: which to choose in 2026?

WebP vs AVIF

★ Recommandé

WebP

8.5/10

+Quasi-universal browser support
+Fast encoding
+Compatible with most tools and CMS
+Good weight/quality balance for photos and illustrations
−Less efficient than AVIF on gradients and uniform zones
−Not recognized by all email clients and social platforms

The safe and universal choice for 2026.

AVIF

9/10

+Better compression: 20 to 30% lighter than WebP
+Excellent for photos with gradients
+Browser support progressing strongly
−Slow encoding: CPU intensive
−Partial support in tools, CMS and social platforms
−Requires fallback outside browser contexts

Technically superior, but premature without fallback.

The short answer: if you’re only publishing images on the web and your compression tool supports it, AVIF is interesting for further weight reduction. If you need broad compatibility (emails, social sharing, CMS without native support), WebP remains the best practicality/compression ratio.

Decision table by use case

Which format for your use case?

Use case	Recommended format	Why
E-commerce product photo	WebP	25-35% lighter than JPEG, transparency if white background cut
Logo / icon with transparent background	PNG	Lossless compression, alpha channel preserved
Blog or article photo	WebP	Good quality/weight ratio, universal support
Exported vector illustration	PNG or SVG	Pixel-perfect sharpness on lines and text
Screenshot with text	PNG	Text stays readable, no JPEG artifact
Image for high-traffic site	AVIF with WebP fallback	Maximum gain if tool supports it
Image for email	JPEG	Only universally compatible format in mail clients
Image for social media	JPEG or PNG	Platforms recompress anyway
Light animation	Animated WebP or GIF	Animated WebP: 3x lighter than GIF

Based on documented compatibilities and benchmarks, May 2026

Social media rule

Instagram, X (Twitter) and Facebook recompress all images on upload according to their own algorithms. Sending WebP or AVIF adds nothing, the platform converts anyway. JPEG priority for these uses.

Convert your images on Impmage

Impmage converts JPEG, PNG, WebP and AVIF directly in the browser — no image leaves your device. Processing is 100% local, no server, no account required.

For each conversion, you choose the target format and compression level. The comparison table displays before/after weight in real time.

For more on compression techniques themselves, see our complete image compression guide.

🪄

Convert your images to the right format

JPEG, PNG, WebP or AVIF: choose the format and compress directly in the browser. 100% local, free, no account.

Try Impmage

Frequently asked questions

Which image format is lightest between JPEG and WebP? ▾

WebP is on average 25 to 35% lighter than JPEG at visually equivalent quality. But this gain varies by image: it's more marked on photos with uniform zones or gradients, and less on highly detailed or already-optimized images.

PNG or JPEG: which for a photo? ▾

JPEG in nearly all cases. PNG preserves every pixel losslessly, making it 5 to 10 times heavier than equivalent JPEG for a photo. PNG is only relevant if you need a transparent background or pixel-perfect fidelity.

Is WebP compatible with all browsers? ▾

Yes for modern browsers. Chrome, Firefox, Edge and Safari (since 2020) support WebP. Browser coverage reaches ~96% per caniuse.com (May 2026). However, WebP isn't universally supported in email clients and some social platforms.

Is AVIF really better than WebP in 2026? ▾

Technically yes: AVIF compresses 20 to 30% more efficiently than WebP at equivalent quality. In practice, its relevance depends on context. For a high-traffic site with many images, the gain is real. For a standard blog, WebP is simpler to deploy and sufficient.

Why is my WebP image sometimes heavier than the JPEG original? ▾

It's possible if the source JPEG was already highly compressed and you convert to WebP at high quality level. Conversion doesn't guarantee a lighter file — it depends on compression parameters and image content.

Which format for images with transparent background? ▾

PNG or WebP. JPEG doesn't support transparency — transparent background becomes opaque white. PNG is the classic choice for logos and icons. WebP also supports transparency while being lighter than PNG for complex images.

Which format for Instagram or social media images? ▾

JPEG or PNG — both work. Social platforms recompress all images on upload per their own algorithms. Uploading WebP or AVIF adds no benefit: the platform converts anyway. Prioritize source quality, not format.

Is AVIF slow to encode? ▾

Yes, significantly more than JPEG or WebP. AVIF encoding is CPU-intensive, which can be problematic on dynamic image flows or mass exports. For manual compression of static images, this delay is negligible.

Sources

[1] 📎 WebP Documentation — Google Developers (2026)
[2] 📎 Can I Use — WebP support (2026)
[3] 📎 Can I Use — AVIF support (2026)
[4] 📎 Alliance for Open Media — AVIF specification (2024)

GlitchGhost

Independent developer

Developer specializing in web performance and image optimization. Creator of Impmage.

Web developerPerformance specialistCreator of Impmage

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