Choose JPG for photographs that must work everywhere, PNG for pixel-perfect graphics and screenshots, WebP for almost everything you publish on your own website, and SVG for logos and icons that must scale cleanly at any size. Those four sentences answer most format questions — but the reasons matter, because the wrong format quietly costs you page speed, quality or compatibility every single day. This guide compares the four formats properly: how each stores an image, what each does to file size and quality, and the edge cases where the simple rules bend.
Key takeaways
- JPG: photos where compatibility matters most — small files, no transparency, supported everywhere since forever.
- PNG: pixel-perfect graphics, screenshots and transparency — exact, but heavy for photographs.
- WebP: the web default — photos and graphics 25–35% smaller than JPG, with transparency and animation, in every modern browser.
- SVG: not pixels at all but drawing instructions — infinitely scalable logos and icons at tiny file sizes. Convert between them free with the Bulk Image Converter.
How the four formats actually store an image
JPG, PNG and WebP are raster formats: they store pixels. JPG uses lossy compression designed for photographs, discarding fine colour detail the eye barely notices. PNG uses lossless compression — every pixel exact — which is safe but heavy. WebP offers both modes, using newer prediction techniques borrowed from video codecs, which is why it beats both at their own games, as What Is WebP? WebP vs JPG vs PNG — A Complete Beginner's Guide details.
SVG is a different species: it stores drawing instructions — lines, curves, shapes, text — in XML. The browser or printer redraws the picture at whatever size is needed. A logo as SVG is a few kilobytes and razor-sharp at favicon size and at billboard size. But SVG cannot represent a photograph; photos are millions of unpredictable pixels, not instructions.
File size: the honest comparison
Take one typical photograph. As PNG it might weigh 4 MB — every pixel kept. As JPG at quality 82, roughly 380 KB. As WebP at equivalent quality, around 260 KB. The JPG and WebP versions are visually indistinguishable from the PNG at display size; the PNG is mostly carrying precision nobody can see.
Now take a logo with flat colours and sharp edges. As PNG: 18 KB and perfect. As JPG: 25 KB — larger, and the edges grow fuzzy halos because JPG's photo tricks punish hard edges. As SVG: 3 KB and perfect at every size. The lesson generalises: match the format to the content, not to habit. Our How to Compress Images Without Losing Quality (Step by Step) guide turns these numbers into a step-by-step workflow.
Transparency, animation and other special powers
Transparency: PNG and WebP both support smooth alpha transparency; JPG supports none — transparent pixels become white or black when converted to JPG. SVG handles transparency naturally, since shapes simply may not cover the canvas. Animation: GIF is the ageing incumbent, WebP animates in full colour at a fraction of the size, while JPG and PNG stay still (the animated-PNG variant exists but support is patchy).
Screenshots deserve a special note. Text and interface edges are exactly what JPG damages, so screenshots belong in PNG — or WebP lossless — even though they are 'images on a screen'. This single rule fixes most blurry-screenshot complaints overnight.
Quality: what 'lossy' really does to your pixels
Lossy formats discard information permanently; every re-save discards a little more. A JPG edited and re-saved ten times visibly degrades — generation loss. PNG and lossless WebP never degrade, which is why masters and archives belong in lossless formats even when published copies are lossy.
The practical workflow professionals use: keep one lossless master (PNG, or your camera original), export JPG or WebP copies for each destination, and never edit the copies. Converting formats becomes a publishing step — and with the Bulk Image Converter handling whole folders at once, it is a quick one.
Compatibility: where each format is welcome
JPG remains the world's most welcome format: every printer, platform, email client and decade-old program accepts it. PNG is nearly as universal. WebP runs in every modern browser — support above 97% of traffic — but some older desktop editors and a few upload forms still refuse it; if a platform rejects your WebP, the WebP to PNG Converter and WebP to JPG Converter exist precisely for that moment.
SVG is supported by all modern browsers for web graphics, but email clients and some social platforms will not touch it — upload a PNG version there, produced at exactly the size you need by the SVG to PNG Converter. Print is its own country with its own rules: see What Is DPI? The Right DPI for Print, Web and Photos Explained before sending anything to a print shop.
So which format should you use? The decision guide
- Photographs on your own website → WebP (JPG fallback if your platform is old)
- Photographs for print shops, email and maximum compatibility → JPG
- Screenshots, diagrams and anything with text → PNG or lossless WebP
- Logos, icons and illustrations that must scale → SVG, with a PNG export for platforms that refuse SVG
- Product images with transparent backgrounds → WebP or PNG
- Animations and stickers → WebP (GIF only for legacy support)
- Masters and archives → PNG or the original camera file, always lossless
Notice the pattern: the question is never 'which format is best' but 'which format fits this content, this destination and this audience'. Formats are tools. The photographer, the web publisher and the print designer legitimately give different answers about the same picture.
Converting without the headaches
Most people need conversions in a handful of recurring moments: a website saved images as WebP but a platform wants JPG; a designer sent SVG but the upload box wants PNG; a folder of PNG photos is crushing a page's load time and needs to become WebP. All of these are one-minute jobs in a browser — no installs, no uploads — with the Image to WebP Converter for single files and the Bulk Image Converter for batches.
Whichever direction you convert, respect the two laws. Lossy to anything cannot restore detail that was already discarded — converting a JPG to PNG makes a bigger file, not a better picture. And converting down a generation — lossy to lossy to lossy — compounds damage, so always convert from the best copy you have.
What about GIF, TIFF and the rest?
GIF survives as the animation format of last resort: limited to 256 colours, large for its quality, but playable absolutely everywhere, including ancient software. WebP does its job better in every measurable way; GIF's remaining moat is pure habit. TIFF is the print and scanning industry's lossless heavyweight — superb quality, enormous files, no place on the web. BMP is a raw Windows relic you should convert away from on sight.
HEIC, the iPhone's photo format, deserves a practical note: it is efficient but poorly supported outside Apple's world, so photos that must travel usually take one trip through JPG or WebP first. The pattern across all of these is the same as the main four: every format is an answer to a specific historical problem, and choosing well means knowing which problem you actually have.
A working photographer's format workflow
Here is the stack a working web photographer actually uses, offered as a template. Camera originals (RAW or best-quality JPG) live untouched in an archive folder — the masters. Editing happens on copies, and the edited master is saved losslessly as PNG or TIFF for print-capable work. Web exports are made per placement: WebP at the exact display size for the site, a JPG twin for platforms that want one, an SVG only if a graphic — never a photo — is involved.
Nothing in that workflow is exotic, and every step maps to a tool on this page: resizing and cropping before export, the Bulk Image Converter for the format passes, and the DPI and EXIF checks from What Is DPI? The Right DPI for Print, Web and Photos Explained and What Is EXIF Data? The Hidden Info Your Photos Carry (and How to Check It) before anything leaves the building. Formats stop being a debate and become a pipeline.
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Frequently asked questions
Which format has the best quality?
PNG and lossless WebP preserve every pixel exactly. For photographs at display sizes, a well-made JPG or WebP is visually identical while being far smaller — 'best quality' depends on whether you mean mathematically exact or visually indistinguishable.
Which format is smallest for photos?
WebP, in almost every test: typically 25–35% smaller than JPG at the same visible quality, and dramatically smaller than PNG for photographic content.
Can SVG replace PNG for logos?
On the web, mostly yes — SVG logos are smaller and sharp at every size. Keep PNG exports for platforms, email clients and tools that do not accept SVG uploads.
Why do my JPG logos look fuzzy?
JPG compression is designed for photographs and smears hard edges and flat colour. Logos should be SVG or PNG; if a JPG already exists, re-export from the vector or PNG master rather than re-saving the JPG.
Does converting JPG to PNG improve quality?
No. It makes the file much larger while keeping exactly the quality the JPG already has — the detail JPG discarded is gone. Always convert from the best available original. When in doubt, keep the original file untouched and convert copies — storage is cheap, but detail discarded by a lossy save is gone forever.
