WebP vs AVIF vs JPG: Which Image Format Should You Use in 2026?
You picked up a JPG in 1996. You picked up WebP around 2018. You started seeing AVIF appear in browser downloads sometime in 2023. Each one is technically "better" than the last — smaller files, same quality — and yet you still have to choose, because each one has somewhere it doesn't quite fit. This is the practical guide to which format wins which job, and what to do when you need to move an image from one bucket to another.
The thirty-second answer
If the destination is a webpage, AVIF first, WebP if AVIF isn't ready, JPG as a final fallback. If the destination is a person — an email attachment, a Word doc, a CMS that hasn't been touched since 2018 — JPG, every time. If the source has transparency or sharp edges (UI screenshots, logos, line art), substitute PNG for JPG in those rules. The rest of this post is the why, the numbers, and what to do when reality doesn't match the rule.
JPG: The thirty-year-old that still wins on compatibility
JPG has been the default photographic format since 1992. Every imaging tool ever made opens it. Every email client renders it inline. Every CMS, ad uploader, government portal, or vintage Word installation accepts it. There is exactly one thing you give up by sticking with JPG: the file is larger than the modern alternatives at the same quality, sometimes much larger.
For everyday user-facing workflows — sending a photo to a friend, attaching a screenshot to a doc, uploading a profile picture, posting to a platform that re-encodes everything anyway — that file-size cost rarely matters. What matters is the file actually opens on the other side. JPG never has the "what is this format and why won't it load" problem.
The other thing JPG can't do is transparency. There's no alpha channel — every transparent pixel becomes whatever background colour you save against (usually white). If your image is a logo on a transparent background, a UI screenshot with rounded corners, or a cut-out product photo, JPG will visibly flatten the edges. PNG is the right fallback there, not JPG.
If you've got HEIC photos from an iPhone and need them to open anywhere, the HEIC to JPG converter is the universal-compatibility move. There's also a HEIC to PNG converter when you need the lossless version.
WebP: The modern web default
WebP showed up in 2010 as Google's answer to "JPG and PNG are both bigger than they need to be." A WebP file is typically twenty-five to thirty-five percent smaller than the equivalent JPG at the same visual quality, and it supports both lossy and lossless modes plus full transparency. Every modern browser — Chrome, Edge, Firefox, Safari — ships with native WebP decoders. The format is no longer "experimental" by any reasonable definition.
For anything web-bound — site assets, CDN-served photos, blog images, product galleries on an ecommerce store — WebP is the right default. Converting your existing JPG and PNG assets typically buys back gigabytes of CDN bandwidth and improves Lighthouse / Core Web Vitals scores noticeably without any visible change to users. The JPG to WebP converter and PNG to WebP converter are the most direct routes for that bulk migration.
The catch is the same one HEIC users hit on Windows: WebP is fine inside browsers and modern apps, but software outside that bubble lags. Microsoft Word still can't reliably embed a WebP. Plenty of email clients refuse to render them inline. Some corporate CMSes will silently reject WebP uploads. If your image needs to travel through one of those workflows, you'll want to convert back to JPG. That's what the WebP to JPG converter is for, and the WebP to PNG converter when transparency matters.
AVIF: The smallest, but with edges
AVIF arrived in 2019 and reached usable browser support around 2022. It's based on the AV1 video codec — the same compression engine that lets you stream 4K video at modest bitrates — applied to single still images. The result is roughly twenty to thirty percent smaller than WebP, fifty percent smaller than JPG, at the same visual quality. It supports transparency, wide colour gamuts, and HDR.
Browser support is now universal: every current Chrome, Edge, Firefox and Safari renders AVIF natively. For squeezing the last bit of file size out of a high-traffic site, AVIF is the most aggressive lever available without sacrificing quality. The JPG to AVIF converter and PNG to AVIF converter handle the source-to-AVIF migration.
The catches are real, though. First, AVIF encoding is computationally expensive — converting a batch of photos takes noticeably longer than the equivalent JPG or WebP encode. You'll feel it on a hundred-image batch on an older laptop. Second, software outside browsers is still uneven. Microsoft Office handles AVIF inconsistently, lots of email clients don't render inline AVIFs, design tools have spotty support, and some asset pipelines silently reject the format. If your image needs to land somewhere outside a modern browser, AVIF is still risky enough to want a fallback. The AVIF to JPG converter and AVIF to PNG converter cover those returns; the AVIF to WebP converter is the right move when the destination accepts WebP but not AVIF.
The numbers, concretely
The percentages above are averages, not guarantees. Real files vary depending on the source content. As a rough mental model for a typical photographic image (a phone photo of a meal, say) saved at "good but not visually lossless" quality:
The JPG might be 800 KB. The same photo saved as WebP at the same visual quality is around 550 KB. The same photo as AVIF is around 400 KB. So the JPG-to-WebP migration cuts thirty percent; WebP-to-AVIF cuts another twenty-five. The numbers swing in favour of the modern formats more aggressively for bigger images and for photos with smooth gradients (skies, skin tones); they swing back toward JPG for grainy or noisy sources.
For graphics — flat-colour logos, UI screenshots, comic-style illustrations — the lossless modes of WebP and AVIF beat PNG by roughly twenty-five and forty percent respectively. PNG is still the universal-compatibility choice there, but the file-size cost is real.
A practical decision tree
When you're saving a new asset, start with the destination. Web-bound assets — anything served by a CDN, embedded on a page, or rendered in a browser — should be AVIF if your tooling supports the encode, WebP otherwise. Person-bound assets — anything that has to land in an email, a Word doc, a presentation, or a CMS uploader you don't control — should be JPG, or PNG if there's transparency or sharp UI involved. When you're not sure who'll receive the file, default to JPG; the file-size penalty is real but small, and the compatibility win is total.
When you're moving an existing asset, ask whether the loss is acceptable. JPG to WebP is "free" in the sense that the new file is at the same quality but smaller; the conversion adds no quality loss beyond what the source JPG already contains. WebP to AVIF is similarly free. JPG to AVIF directly works fine but doesn't recover the quality that was lost in the original JPG encode — you're saving an AVIF of an already-lossy image, not magically restoring it.
When you're going backwards — AVIF to JPG, WebP to JPG — the file gets bigger but you gain compatibility. There's no quality loss in the conversion itself for typical workflows; the image content is preserved, just in a less efficient container. Worth doing when you need the file to open somewhere that doesn't speak the modern format.
What about PNG?
PNG is the lossless graphics format. It's bigger than the modern alternatives at the same quality, but every imaging tool ever made opens it, it supports transparency natively, and it survives any number of round-trips through edits without losing pixel data. The right place for PNG is the design source tree, archival storage, anything where lossless quality and universal compatibility together matter more than file size.
For shipping to the web, treat PNG as a legacy format you should usually replace with WebP or AVIF. The PNG to WebP converter and PNG to AVIF converter make the migration trivial. For everything else — design work, archival, anywhere transparency matters — PNG is still the right answer.
A few real scenarios
You're shipping a marketing site and Lighthouse keeps flagging your hero photo as too large. Your source is a 4 MB JPG. Converting to AVIF will land somewhere around 800 KB to 1.2 MB at the same visual quality. WebP gets you to about 1.5 MB. Either is a major Lighthouse win; AVIF is more aggressive but takes longer to encode. The JPG to AVIF converter handles this in about ten seconds for a single image.
You took a screenshot, your Mac saved it as PNG, and now it's a 4 MB file you can't email. The image is mostly UI with sharp text — that's actually a worst case for JPG (it'll smear the text edges). WebP lossless preserves the sharp edges and might cut the file size by twenty-five percent. AVIF lossless cuts it further. If the recipient is using Outlook 2019, fall back to JPG and accept some text smearing; otherwise, PNG to WebP is the right move.
You downloaded an AVIF from a modern site and your boss can't open it in PowerPoint. The fix is one click — convert AVIF to JPG and email the JPG. The file gets bigger but the deck embeds the image cleanly.
Your iPhone is generating HEICs and your team is on Windows. The HEIC format is even worse than AVIF for compatibility outside Apple's ecosystem. Convert in bulk to JPG with the HEIC to JPG converter before uploading anywhere shared, and the rest of your team will stop sending you screenshots of broken thumbnails.
The shortest path
You don't have to memorise the table. The conversion tools are all browser-side, free, no upload, no account. Pick the source format on the left, the target on the right, drop the file in, download the result. Most conversions take under a second per image. None of them upload your file anywhere — every conversion runs locally in your browser using the Canvas API.
If you want to keep more than format flexibility — crop, watermark, magic-erase a thing in the corner — open the result in the image editor and take it from there. The editor accepts any of the formats listed above and exports to any of them, so it's the right closing step when the conversion is just one part of what you're trying to do.