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June 21, 2026 · 7 min read
Pick the wrong image format and you either ship a blurry photo or a file ten times heavier than it needs to be. The good news: the decision almost always comes down to a few simple questions. This guide walks through the four formats you actually meet in 2026 — JPEG, PNG, WebP and AVIF — and when each one wins.
JPEG (or JPG) has been the web's workhorse for nearly 30 years. It uses lossy compression, meaning it throws away detail your eye is unlikely to notice in order to shrink the file. For photographs — anything with smooth gradients, skin tones or natural scenes — it strikes an excellent balance between size and quality.
Its weaknesses: no transparency, and visible artifacts around sharp edges and text. Never save a logo, screenshot or line drawing as JPEG. But for a holiday photo headed to email or a blog, JPEG at 70–80% quality is hard to beat and works literally everywhere.
PNG is lossless: it keeps every pixel exactly as it was. That makes it the right choice for logos, icons, screenshots, diagrams and anything with text or hard edges. It also supports transparency, which JPEG cannot.
The catch is size. A photo saved as PNG can be five to ten times larger than the same photo as JPEG. Use PNG when you need crisp edges or a transparent background — not for full-colour photographs.
WebP, developed by Google, does both jobs: it has a lossy mode that beats JPEG by roughly 25–35% at the same quality, and a lossless mode that beats PNG. It also supports transparency and animation.
By 2026 every major browser supports WebP, so it's a safe modern default for the web. If you want one format that handles both photos and graphics while keeping pages light, WebP is usually it.
AVIF is the newest of the four and compresses the hardest — often 50% smaller than JPEG at comparable quality, with excellent handling of gradients and dark scenes. It supports transparency, HDR and animation.
The trade-offs: encoding is slower, and while browser support is now broad, a few older devices and apps still can't open AVIF. Use it for the web when squeezing every kilobyte matters, but keep a JPEG or WebP fallback if your audience uses older software.
Every choice in this article comes back to one question: is the format allowed to throw information away? Lossless formats — PNG, GIF, lossless WebP — reproduce the original pixel for pixel. Compress, decompress, and you get back exactly what you started with. Lossy formats — JPEG, lossy WebP, AVIF — permanently discard detail judged least visible, and get dramatically smaller files in exchange.
The trap is that lossy compression is cumulative. Each time a lossy image is opened and re-saved, another round of loss is applied on top of the last. Save a JPEG five times at 80% quality and it looks worse than the same image saved once at 60%. This is called generation loss, and it is the single most common cause of images that mysteriously degrade over time.
The working rule: use lossless while you are still editing an image, and convert to lossy once, at the end, when you export the final version.
JPEG has no alpha channel at all. There is no way to store a transparent pixel in a JPEG, so any transparency in the source has to be flattened onto a solid colour — almost always white. This is why a logo exported as JPEG arrives with a white box around it, and it is the single most common reason people are told to avoid JPEG for graphics.
PNG, WebP and AVIF all support a full 8-bit alpha channel, meaning 256 levels of transparency rather than a simple on/off. That matters more than it sounds: soft drop shadows, anti-aliased curves and faded edges all rely on partial transparency, and they look ragged without it.
GIF is the awkward exception you still meet occasionally. It supports transparency, but only one bit of it — a pixel is either fully opaque or fully transparent. Diagonal and curved edges therefore come out visibly jagged, which is why GIF logos look dated even when the design is not.
Animated GIF survives for cultural reasons rather than technical ones. It is limited to 256 colours per frame, has no lossy compression to speak of, and produces files that are routinely ten to twenty times larger than an equivalent video. A three-second animated GIF can easily weigh 5MB.
Both WebP and AVIF support animation, with full colour and proper compression, and either is a straight upgrade. An animated WebP of the same clip typically lands somewhere between a fifth and a tenth of the GIF's size while looking better.
For anything longer than a couple of seconds, though, the right answer is not an image format at all — it is a muted, autoplaying, looping MP4 or WebM video. Video codecs are designed for exactly this and will beat any image format by a wide margin. Reserve animated WebP for short loops where the simplicity of an image tag matters.
SVG is not a competitor to any of the four, because it is not made of pixels. It stores shapes as mathematical descriptions, so it scales to any size without ever blurring and usually weighs a fraction of a bitmap. For logos, icons, charts and line illustrations it is the correct choice and nothing else comes close. It cannot represent photographs.
HEIC is what your iPhone shoots by default. It stores roughly JPEG quality in half the space and supports 16-bit colour, but patent licensing kept it out of most non-Apple software. It is a fine storage format inside Apple's ecosystem and a poor sharing format outside it, which is why converting to JPEG remains such a common task.
TIFF is the archival and print format: lossless, enormous, and capable of storing layers, CMYK colour and 16 bits per channel. You will meet it in professional printing and document scanning workflows. It has no place on a website — a TIFF is often twenty times the size of the JPEG a browser would have been happy with.
Start with the content, not the format. If the image is a logo, icon, chart or line drawing, use SVG and stop — none of the four bitmap formats will do better. If it contains photographic detail, you are choosing between JPEG, WebP and AVIF. If it is a screenshot, a diagram or text on a flat background, you are choosing between PNG and lossless WebP.
Then apply the destination. For a website in 2026, serve AVIF with a WebP fallback for photographs, and lossless WebP or PNG for graphics. For a file you are sending to someone else, or uploading to a form you do not control, JPEG for photographs and PNG for graphics remain the formats nothing rejects.
Finally, apply the transparency test. If any part of the image needs to be see-through, JPEG is eliminated regardless of everything above, and you are choosing between PNG, WebP and AVIF.
Photo for the web and you want it as small as possible: AVIF, with WebP as fallback. Photo that must open anywhere: JPEG. Logo, icon, screenshot or anything with transparency: PNG, or WebP/AVIF lossless to save space. Still unsure: WebP is the modern all-rounder.
Whatever you choose, the file is almost always bigger than it needs to be straight out of the camera or design tool. Run it through our compressor, pick your output format, and watch the size drop — everything happens in your browser, so your image never leaves your device.