JPEG XL vs WebP: Which Image Format Should You Use?

Choosing between jpeg xl vs webp matters more than it seems. The format you pick affects page speed, visual quality, storage cost, and even how long your content stays future‑proof.

Both formats promise smaller files than classic JPEG and PNG. Both can deliver sharp images for modern screens. Yet they differ in compression style, browser support, and how they handle advanced use cases like HDR and lossless workflows.

This article walks through webp vs jpeg xl with a practical lens: what each format does well, where it falls short, and how to decide what to ship in production.

What Are WebP and JPEG XL?

Before comparing, it helps to understand what each format was designed to solve.

WebP in a nutshell

WebP is a modern image format created by Google and based on the VP8 video codec. It supports both lossy and lossless compression, along with transparency and simple animation.

A concrete example: a 120 KB JPEG product photo can often be reduced to around 60–80 KB as WebP with similar perceived quality. On a catalog page with 20 images, that can save close to 1 MB per view.

Key traits of WebP:

Lossy and lossless modes
Alpha transparency (like PNG)
Basic animation (like GIF)
Strong support in Chromium‑based browsers and Firefox

JPEG XL in a nutshell

JPEG XL is a newer image format designed by the Joint Photographic Experts Group (the same body behind classic JPEG). It aims to be a long‑term replacement for JPEG, PNG, and even some TIFF workflows.

One standout feature is lossless JPEG recompression. You can convert an existing JPEG to JPEG XL without any quality loss and still shrink the file by 20–30% or more.

Example: a 1.2 MB high‑quality JPEG from a DSLR can often be turned into a 700–800 KB JPEG XL file with no visible difference, and in some cases, no difference at all at the pixel level.

Key traits of JPEG XL:

Very efficient lossy and lossless compression
Support for wide color gamuts and HDR
Lossless JPEG recompression
Designed for professional imaging pipelines

Compression: JPEG XL vs WebP File Sizes

Compression efficiency is usually the first concern in an image format comparison. Smaller files mean faster loads and lower bandwidth bills, as long as quality stays acceptable.

Lossy compression

Both formats use advanced techniques beyond classic JPEG, such as better entropy coding and more flexible transforms.

In many real‑world tests:

WebP often reduces file size by 25–35% compared to JPEG for similar visual quality.
JPEG XL often reduces file size by 35–50% compared to JPEG at similar or better visual quality.

Imagine a news site with 100 hero images, each 400 KB as JPEG. Converting them to WebP might bring them down to ~260–300 KB each. Using JPEG XL could push them to ~200–250 KB each at the same perceived sharpness. Across the full library, that difference adds up to tens of megabytes.

JPEG XL also handles difficult content, such as gradients and fine textures, more gracefully. Banding in skies, noise in shadows, and subtle skin tones tend to survive better at lower bitrates.

Lossless compression

Lossless compression matters for UI assets, icons, screenshots, and any image that must remain pixel‑perfect.

WebP lossless typically beats PNG by 20–40%.
JPEG XL lossless can beat PNG by 30–60%, and often beats WebP as well.

Take a 500 KB PNG UI screenshot. A WebP lossless version might land around 300–350 KB. A JPEG XL lossless version could drop closer to 250–300 KB while remaining bit‑identical to the original.

Lossless JPEG recompression

This is where JPEG XL does something WebP cannot.

You can take an existing JPEG file, wrap it into JPEG XL, and shrink it without losing a single bit of image data. The format stores enough information to reconstruct the original JPEG byte‑for‑byte.

For a photo archive of 100 GB of JPEGs, recompressing to JPEG XL can save 20–30 GB without re‑encoding images or risking new artifacts. WebP would require a lossy re‑encode, introducing generational loss.

Compression speed and decoding cost

Compression speed depends heavily on encoder settings. Aggressive tuning for the smallest size will always be slower, regardless of format.

Broadly:

WebP encoding is mature, stable, and reasonably fast at standard quality levels.
JPEG XL encoding can be slower at the highest quality or smallest size targets, though tools are improving.
Decoding speed for both formats is suitable for web use, with WebP having more battle‑tested implementations in browsers.

For a typical web workflow that pre‑encodes assets during a build step, encoding speed rarely becomes a blocker. For on‑the‑fly image services, benchmarks and careful tuning matter more.

Visual Quality and Advanced Features

File size alone does not tell the full story. The way a format handles gradients, text, and color depth has a direct impact on perceived quality.

Handling gradients and fine detail

Classic JPEG often struggles with smooth gradients. Skies, out‑of‑focus backgrounds, and subtle vignettes can show banding or blocky artifacts at lower bitrates.

Both WebP and JPEG XL improve on this, but JPEG XL generally retains gradients and fine detail better at the same file size.

Example: a landscape photo with a blue sunset sky and distant foliage. At 100 KB:

A WebP version may show slight banding in the sky and some loss of leaf texture.
A JPEG XL version at the same size tends to keep smoother gradients and more natural detail in the trees.

Text, UI, and line art

For screenshots, diagrams, and interface elements, sharp edges are critical.

WebP lossless works well as a drop‑in replacement for PNG in many UI scenarios.
JPEG XL lossless often produces even smaller files, while keeping crisp lines and readable small text.

A concrete case: a dark‑mode dashboard screenshot with thin grid lines and small labels. PNG might be 800 KB. WebP lossless could bring it to 450 KB. JPEG XL lossless might land around 350–400 KB with identical sharpness.

Color, HDR, and future‑proofing

WebP was designed primarily for standard dynamic range (SDR) and sRGB workflows. While it supports more than the bare minimum, it does not target advanced imaging scenarios aggressively.

JPEG XL, on the other hand, supports:

Wide color gamuts (such as Display P3 and Rec.2020)
High dynamic range content
Higher bit depths suitable for professional photography and video pipelines

For a streaming service serving HDR stills from 4K content, JPEG XL can store frame grabs or promotional art with much richer tonal range than WebP, while keeping sizes manageable.

Animation support

WebP supports simple animation, which often replaces GIF for short loops and stickers.

JPEG XL can also store animation, but browser support for animated JPEG XL is currently limited.

If you rely on animated stickers or looping UI elements, WebP remains the practical choice for the web today. JPEG XL is more attractive for static high‑quality images and archives.

Browser Support and Ecosystem Readiness

Technical strength does not matter if users cannot see the images. Browser and tooling support is a central part of any image format comparison.

WebP browser support

WebP enjoys broad support across modern browsers:

Chrome, Edge, and other Chromium‑based browsers: full support
Firefox: full support
Safari: support for WebP since Safari 14

On desktop and mobile, this coverage is strong enough that many sites now serve WebP as the primary format with a JPEG or PNG fallback for older clients.

A typical pattern in HTML uses <picture> with multiple sources, starting with WebP and falling back to JPEG when needed.

JPEG XL browser support

JPEG XL has a more complex story.

Chrome and Edge: experimental support existed but was removed from stable builds.
Firefox: no default support at the time of writing.
Safari: early experimental support has appeared in some releases and platforms, but not across the board.

Some browsers can enable JPEG XL via flags or experimental builds, and various image tools already support it. However, you cannot assume universal support on the public web yet.

For a consumer‑facing site, that means JPEG XL must be served as an optional enhancement with robust fallbacks. For internal tools, native apps, or controlled environments, JPEG XL can already be used more aggressively.

Tooling and CDN support

WebP:

Supported by major CDNs and image optimization services like Cloudflare Images, Cloudinary, Imgix, and others.
Supported by popular build tools and libraries such as Sharp, ImageMagick, and many CMS plugins.

JPEG XL:

Supported by some image processing libraries and command‑line tools.
Limited direct support in commercial CDNs, though this is slowly changing.

If your pipeline depends heavily on third‑party optimization services, WebP usually integrates with less friction right now.

Practical Use Cases: When to Choose Each Format

The jpeg xl vs webp decision rarely has a single answer for every asset. Different image types benefit from different trade‑offs.

High‑traffic public websites

For a content site, ecommerce catalog, or marketing landing page, the priorities are:

Reliable browser support
Good compression
Simple deployment

In this environment, WebP is usually the primary choice.

Example: an online clothing store with product photos and lifestyle shots.

Serve WebP for supported browsers.
Keep JPEG as a fallback for older devices.
Use responsive images to avoid over‑sending pixels.

JPEG XL can still play a role for internal storage, but not as the main delivery format yet.

Photo archives and media libraries

For photography portfolios, stock photo libraries, or news archives, long‑term quality and storage cost are key.

Here, JPEG XL shines:

Lossless JPEG recompression saves space without any quality loss.
Future‑proof features like wide gamut and HDR support protect against repeated migrations.

A photo agency with 5 million JPEGs can convert them to JPEG XL as a back‑end storage format, while still exporting WebP or JPEG derivatives for web delivery.

Design systems, UI kits, and documentation

Interface assets need crisp edges and small file sizes. They also benefit from lossless workflows.

WebP lossless works well for many cases, but JPEG XL offers even better compression and better handling of mixed content, such as gradients plus text.

A design team could:

Store master UI screenshots and diagrams as JPEG XL lossless.
Export to WebP or PNG for platforms that do not yet support JPEG XL.

This keeps source assets small and flexible, while still serving compatible formats to users.

HDR and high‑end imaging

Where HDR, wide color, and high bit depth matter, JPEG XL is more suitable.

Use cases include:

Still frames from HDR video production
High‑end photography retouching workflows
Scientific imaging where precision is important

WebP can still be used for SDR previews, but JPEG XL is better suited as the master format.

Verdict Table: JPEG XL vs WebP at a Glance

The following table summarizes major differences in webp vs jpeg xl across several dimensions.

AspectWebPJPEG XLCompression (lossy)~25–35% smaller than JPEG~35–50% smaller than JPEG at similar qualityCompression (lossless)~20–40% smaller than PNG~30–60% smaller than PNG; often smaller than WebPLossless JPEG recompressionNot supportedSupported; ~20–30% savings on existing JPEGsVisual quality at low bitratesGood, better than JPEGVery good; smoother gradients, fewer artifactsHDR and wide gamut supportLimited, mainly SDR workflowsStrong support for HDR and wide gamutsAnimationSupported (replaces GIF in many cases)Supported but not widely implemented in browsersBrowser support (public web)Strong across major browsersLimited and inconsistentTooling and CDN integrationMature and widely availableEmerging, not universalBest suited forPublic websites and appsArchives, pro imaging, and future‑proof storage

Recommended Strategies for Real‑World Use

Rather than picking a single winner, it helps to define a strategy that leverages both formats where they fit best.

For public websites

Use WebP as the main modern format for photos and illustrations.
Keep JPEG or PNG as a fallback for legacy browsers.
Consider using build tools or CDNs that auto‑convert to WebP.

If JPEG XL support improves in mainstream browsers, you can extend the <picture> element to offer a JPEG XL source first, then WebP, then JPEG.

For internal storage and workflows

Store master assets as JPEG XL for long‑term durability and lower storage costs.
Export to WebP, JPEG, or PNG depending on the target platform.

This dual‑format approach provides the best of both worlds: modern delivery today and a flexible archive for tomorrow.

For performance‑critical apps

When every millisecond counts, such as in mobile apps on slow networks:

Benchmark WebP and JPEG XL decoding on target devices if possible.
Consider using WebP for compatibility and speed, while exploring JPEG XL for specific high‑value assets.

FAQ: JPEG XL vs WebP

Is JPEG XL better than WebP?

JPEG XL often delivers better compression and quality than WebP, especially for high‑quality photos, lossless images, and HDR content. However, WebP has far better browser support today, which makes it more practical for most public websites.

Should you replace WebP with JPEG XL on your site?

For most sites, no, not yet. WebP remains the safer choice for primary delivery because of its strong browser support. JPEG XL can be used as an internal storage format or as an optional enhancement where you can detect support.

Which format gives the smallest files?

For many image types, JPEG XL produces smaller files than WebP at the same quality level. This is especially true for lossless images and recompressed JPEGs. That said, real‑world results depend on encoder settings and the source content, so testing on your own assets is important.

Is WebP still worth using if JPEG XL exists?

Yes. WebP is widely supported, well integrated into tools and CDNs, and offers a strong balance of quality and size. JPEG XL adds capabilities on top of that, but until browsers support it consistently, WebP remains essential.

How should you decide between WebP and JPEG XL?

For general web delivery, prefer WebP with legacy fallbacks. For archives, professional imaging, and HDR workflows, consider JPEG XL as the master format and convert to WebP or JPEG for distribution. Combining both formats gives a flexible, future‑ready image strategy.

JPEG XL vs WebP: Which Image Format Should You Use?

JPEG XL vs WebP: Which Image Format Should You Use?