PNG to JPG, WebP to PNG, SVG to PNG, HEIC to JPG — convert any image format to any other format for free, instantly, in your browser. No software needed.
I have a confession: I once spent forty-five minutes trying to figure out why my website's hero image wouldn't display properly. The file looked fine on my desktop. The dimensions were right. The colors were right. But the browser just showed a broken image icon.
The problem? The image was a .webp file, and I was testing in an old browser that didn't support it. Forty-five minutes of my life, gone, because I picked the wrong image format.
If you've ever stared at the "Save As" dropdown in an image editor and wondered what the difference between PNG, JPG, WebP, TIFF, and BMP actually is — or if you've ever received an HEIC file from an iPhone and had no idea how to open it — this guide is for you.
I'm going to explain every major image format in plain English, tell you exactly when to use each one, and show you how to convert between any of them for free, right in your browser. No software to install. No accounts to create. No files uploaded to anyone's servers.
Let's start with the question nobody seems to answer clearly.
This is genuinely a good question, and the answer is surprisingly simple: every format was designed to solve a different problem.
JPEG (1992) was created when the internet was slow and storage was expensive. It threw away some image data to make files smaller — a tradeoff that made sense when a 100KB photo took thirty seconds to download on a dial-up connection.
PNG (1996) was created because the company that owned the GIF patent started demanding royalties. PNG was free, open, and supported something JPEG couldn't: transparency. Now you could put a logo on any background without an ugly white box around it.
GIF (1987, but still somehow alive) survived because of one killer feature: animation. Before HTML5 video was a thing, GIF was the only way to put a moving image on a webpage.
SVG (2001) took a completely different approach. Instead of storing pixels, it stored math — shapes, lines, curves. Scale it to any size and it stays perfectly sharp. Your browser just redraws the math.
WebP (2010) was Google's attempt to replace both JPEG and PNG with a single format that produced smaller files at the same quality. It took over a decade, but it's now supported everywhere that matters.
AVIF (2019) pushed even further than WebP, squeezing even more quality out of even smaller files. It's still gaining browser support but is already usable for many workflows.
HEIC (2017) was Apple's choice for iPhone photos. Great compression, great quality — but almost nothing outside the Apple ecosystem can open it, which creates headaches for millions of people every day.
BMP and TIFF are the old guard. BMP stores every pixel without compression (enormous files). TIFF is used in professional printing and photography because it preserves every detail.
Each format represents a different point on the triangle of quality, file size, and features. There's no single "best" format — only the best format for your specific situation.
Here's everything you need to know at a glance:
| Format | Best For | Lossy/Lossless | Transparency | Animation | Typical Size | Browser Support |
|---|---|---|---|---|---|---|
| JPEG/JPG | Photos, gradients | Lossy | No | No | Small | Universal |
| PNG | Logos, screenshots, transparency | Lossless | Yes | No | Medium-Large | Universal |
| WebP | Web images (all types) | Both | Yes | Yes | Very Small | 97%+ browsers |
| AVIF | Modern web, high quality | Both | Yes | Yes | Smallest | ~93% browsers |
| SVG | Icons, logos, illustrations | Vector (lossless) | Yes | Yes (CSS/JS) | Tiny-Small | Universal |
| GIF | Simple animations, memes | Lossless (256 colors) | Yes (1-bit) | Yes | Large | Universal |
| HEIC/HEIF | iPhone photos | Lossy | Yes | Yes | Small | Safari only |
| BMP | Legacy systems | Uncompressed | No | No | Very Large | Universal |
| TIFF | Print, archival | Both | Yes | No | Very Large | Requires viewer |
| ICO | Favicons | Lossless | Yes | No | Tiny | Browsers only |
A few things jump out from this table. WebP and AVIF can do almost everything — transparency, animation, lossy or lossless compression — in smaller file sizes. The reason we haven't all switched to them is compatibility. JPEG and PNG work literally everywhere, on every device, in every application, going back decades.
That said, the world is moving toward WebP fast. If you're building anything for the web in 2026, WebP should be your default. More on that later.
Stop guessing. Walk through these questions:
1. Is it a vector graphic (logo, icon, illustration with clean lines)?
2. Does it need animation?
3. Does it need transparency?
4. Is it a photograph or image with lots of color gradients?
5. Is it a screenshot, diagram, or image with text?
6. Is it for email or social media?
Still not sure? When in doubt: WebP for web, PNG for transparency, JPEG for photos, SVG for vectors. You'll be right 95% of the time.
Before we get into actual conversion, let's talk about the thing that trips people up the most: quality loss.
Lossless compression is like zipping a file. The file gets smaller, but when you unzip it, every single bit is identical to the original. PNG and lossless WebP work this way. Convert back and forth all day — you'll never lose a pixel.
Lossy compression is like summarizing a book. You keep the important parts and discard the details most people won't notice. JPEG does this aggressively, throwing away subtle color variations and fine texture details. The result is dramatically smaller files, but the discarded data is gone forever.
Here's the critical thing: every time you re-save a lossy image, you lose more quality. Save a JPEG, open it, save it again — each cycle introduces more artifacts. It's like making a photocopy of a photocopy. This is called generation loss.
For JPEG, the sweet spot is 80-85% quality. Below 75%, you'll start seeing visible artifacts — those blocky patches around edges and in smooth gradients. Above 90%, the file size increases dramatically with minimal visible improvement.
For WebP, you can typically go 5-10% lower than JPEG and get the same visual result. A WebP at 75% quality often looks as good as a JPEG at 85% quality, in a smaller file.
For AVIF, the compression advantage is even more dramatic. An AVIF at 60% quality can rival a JPEG at 85%. But encoding is slower, which matters for batch operations.
Always convert from the highest-quality source you have. If you have the original PNG, convert from that. If you only have a JPEG, convert from the JPEG — but understand you can't get back quality that was already lost. Converting a 50%-quality JPEG to PNG doesn't make it lossless; it just stores the already-degraded image without further degradation.
Think of it like this: you can pour water from a big glass into a smaller glass and back, but the water that spilled is gone.
Let me walk you through the most common conversions people need, and how to do them right.
Why you'd do this: Your PNG is too large for email, social media, or a website, and it doesn't need transparency.
What to expect: A PNG photo that's 5MB might become a 500KB JPEG. That's a 90% reduction. The trade-off is a slight loss in quality — but at 85% compression, most people can't tell the difference.
Steps:
Watch out for: If your PNG has transparency, the transparent areas will become white (or whatever background color the converter uses) in the JPEG. JPEG simply doesn't support transparency. If you need transparency, convert to WebP instead.
Why you'd do this: You need a lossless version for editing, or you're adding the image to a design that requires transparency support.
What to expect: The file will get larger, not smaller. You're converting from a lossy format to a lossless one — but remember, you're not getting back the data JPEG already discarded. You're just preventing further degradation.
Steps:
Pro tip: This conversion is useful when you're going to do heavy editing. Edit in PNG (no generation loss), then export to JPEG for final delivery.
Why you'd do this: You downloaded a WebP image from a website and need to use it in software that doesn't support WebP, or you need to upload it somewhere that only accepts JPEG/PNG.
This is one of the most common conversion needs I see. WebP is everywhere on the web now, but plenty of applications, email clients, and social media platforms still don't handle it well.
Steps:
Why you'd do this: You're building a website and want smaller images that load faster. This is the single most impactful thing you can do for web performance without changing your images visually.
What to expect: 25-35% smaller files than JPEG at equivalent quality. For PNG images, the savings can be even more dramatic — sometimes 50-70% smaller.
Steps:
This deserves its own section because it affects millions of people and the solution should be simple, but Apple makes it confusing.
Since iOS 11 (2017), iPhones save photos in HEIC format by default. HEIC files are about 50% smaller than JPEG at the same quality, which saves space on your phone. Great.
The problem: almost nothing outside Apple's ecosystem can open HEIC files. Try to email an HEIC photo to someone on Windows or Android, upload it to many websites, or open it in most image editors, and you'll get an error or a blank preview.
The quick fix:
The long-term fix: On your iPhone, go to Settings → Camera → Formats and select Most Compatible. Your photos will now save as JPEG. You'll use more storage, but you'll never have compatibility problems again.
Why does Apple do this? Honestly, HEIC is a better format technically. The problem is that Apple adopted it years before the rest of the ecosystem was ready. In 2026, Windows and Android have gotten better at handling HEIC, but it's still not universal. If you share photos frequently, stick with JPEG or convert before sharing.
Why you'd do this: You have a vector logo or icon that needs to be a raster image — maybe for a social media profile picture, an email signature, or software that doesn't support SVG.
What to expect: You'll specify the output dimensions (e.g., 1024x1024), and the converter will rasterize the SVG at that exact size. The result is pixel-perfect because SVG scales to any resolution before rasterizing.
Steps:
Pro tip: Always export SVG to PNG at 2x the size you need (e.g., 2048x2048 if you need 1024x1024). This gives you a high-DPI version that looks crisp on retina displays, and you can always scale it down.
Why you'd do this: GIFs are absurdly large. A 5-second GIF animation can easily be 10-20MB. The same animation as MP4 might be 500KB. That's not a typo — video compression is just vastly more efficient than GIF's frame-by-frame approach.
If your GIF is going on a webpage, converting it to WebP or MP4 will make your page load dramatically faster. Most browsers now autoplay muted MP4 videos just like GIFs, so the user experience is identical.
One image? Use any converter. Fifty images? You need batch conversion.
Batch conversion lets you convert multiple images at once, applying the same settings to all of them. This is essential when you're:
Browser-based converters like the ones on akousa.net handle batch conversion well — you can drop multiple files at once and download them all when they're done. Everything runs in your browser, so even with fifty images, nothing gets uploaded to a server.
For truly massive batches (thousands of images), you might need a command-line tool. But for most people, browser-based batch conversion handles the workload just fine.
Organize first. Separate images by type before converting. Photos go in one folder (convert to WebP or JPEG), screenshots and graphics go in another (convert to PNG or WebP lossless).
Test with a few images first. Convert 3-5 images, check the quality, adjust settings, then batch the rest.
Keep your originals. Always. Convert copies, not originals. Storage is cheap; lost originals are expensive.
Use consistent quality settings. If you're converting a batch for a website, use the same quality level for all images so the visual consistency is maintained.
Different destinations have different requirements. Here's what you need to know for the most common ones.
If you're building or managing a website, image format choice is one of the biggest performance levers you have. Images typically account for 50-70% of a webpage's total size.
Best practice in 2026:
Dimensions matter too. Don't upload a 4000x3000 pixel photo for a 800px-wide content area. Resize it to the maximum display width (plus 2x for retina) and then convert. A 1600x1200 WebP at 80% quality will be a fraction of the original's file size.
Social media platforms re-encode your images no matter what you upload. Twitter, Instagram, Facebook, LinkedIn — they all have their own compression pipelines. But you can still control the input quality.
For Facebook and Instagram:
For Twitter/X:
For LinkedIn:
General rule: Upload the highest quality you can within the platform's size limits. The platform will compress it; let them work with the best source material possible.
Email is the most restrictive medium for images. Here's why:
Many email clients don't support WebP. Outlook (desktop), older versions of Gmail's mobile app, and many corporate email systems still don't render WebP. Stick to JPEG and PNG for email.
Total email size matters. Many corporate mail servers reject emails over 10-25MB. If you're attaching images, compress them.
Embedded images vs. attachments. Images in the email body (embedded) need to be small — under 200KB each if possible. Attachments can be larger.
For email, convert to:
Print has completely different requirements from web. On screen, 72-96 PPI (pixels per inch) looks fine. In print, you need 300 DPI minimum.
For print, prioritize:
Never use for print: WebP (not supported by most print software), GIF (only 256 colors), or any image that started as a low-resolution web graphic.
Resolution check: For a 4x6 inch print at 300 DPI, you need an image that's at least 1200x1800 pixels. For a poster (24x36 inches), that's 7200x10800 pixels. If your source image isn't large enough, no amount of format conversion will save you — you need a higher-resolution original.
I want to spend some extra time on WebP because it represents a genuine shift in how images work on the web, and many people still haven't adopted it.
WebP produces files that are:
In 2026, WebP is supported by 97%+ of browsers globally. The remaining holdouts are old Internet Explorer installations and some embedded browsers. For all practical purposes, WebP is universally supported.
Google has been very clear that page speed affects search rankings. Images are typically the largest assets on any webpage. Switching from JPEG to WebP can cut your image payload by a third without any visible quality difference.
For a typical blog post with 5-6 images totaling 2MB in JPEG, converting to WebP would save roughly 500-700KB. That's 0.5-0.7 seconds on a 3G connection. For image-heavy sites like portfolios or e-commerce stores, the savings are even more significant.
If you manage a website, here's the pragmatic approach:
Akousa<picture> element to serve WebP with fallbacks:<picture>
<source srcset="image.webp" type="image/webp" />
<source srcset="image.jpg" type="image/jpeg" />
<img src="image.jpg" alt="Description" />
</picture>The conversion itself takes seconds using any browser-based converter. It's the easiest performance win you'll ever get.
SVG (Scalable Vector Graphics) deserves special attention because it works fundamentally differently from every other format on this list.
Every other format here stores pixels — a grid of colored dots. Zoom in far enough, and you see squares. SVG stores instructions — "draw a circle here, a line there, fill this area with blue." Your browser (or any SVG viewer) follows the instructions and draws the image fresh every time, at whatever size is needed.
This means:
Raster to SVG (PNG/JPG to SVG): This is tricky. You're asking a computer to figure out the shapes and lines from a grid of pixels. Simple images (logos with clean lines) convert reasonably well. Complex images don't. Tools that "trace" raster images to SVG exist, but the results require cleanup.
SVG to raster (SVG to PNG/JPG): This is straightforward. The converter renders the SVG at your specified dimensions and saves the result as pixels. Use an SVG to PNG converter and specify the exact dimensions you need.
AVIF is the newest format worth knowing about. It's based on the AV1 video codec and delivers stunning compression ratios.
| Metric | JPEG | WebP | AVIF |
|---|---|---|---|
| File size (same quality) | Baseline | ~30% smaller | ~50% smaller |
| Encoding speed | Fast | Fast | Slow |
| Browser support (2026) | 100% | 97%+ | ~93% |
| Max color depth | 8-bit | 8-bit | 10-bit, 12-bit |
| HDR support | No | No | Yes |
AVIF's main drawback is encoding speed — it takes noticeably longer to convert images to AVIF than to WebP or JPEG. For a single image, it's no big deal. For batch converting thousands of images, the time adds up.
For personal blogs and portfolios: Probably not yet. WebP gives you most of the benefits with wider support and faster encoding.
For high-traffic websites: Consider it. The bandwidth savings at scale are substantial, and you can fall back to WebP and JPEG for unsupported browsers.
For image-heavy applications: Yes, with fallbacks. Photo galleries, e-commerce product images, and media sites benefit the most from AVIF's superior compression.
Every time you take a photo, your camera (including your phone camera) embeds metadata — data about the data. This includes:
That GPS data is a big deal. If you take a photo at home and share it online with EXIF data intact, anyone who downloads the image can extract your home address. This is not a theoretical concern — it has been used to stalk people, identify homes for burglary, and dox individuals online.
When you convert images, metadata handling depends on the tool:
If you're sharing images online — on social media, blogs, forums, or anywhere public — strip the metadata first. Most social media platforms do this automatically, but not all platforms, and not all sharing methods (email, direct links, forum uploads) strip it.
Browser-based converters that process images locally (in your browser, not on a server) are ideal for this. Your files never leave your machine, and you can strip metadata before sharing. The image converters on akousa.net work this way — everything is processed client-side.
Different formats handle metadata differently:
When converting between formats, be aware that some metadata may be lost or transformed. If you're a photographer who needs to preserve camera data, verify that your conversion tool handles metadata correctly for your workflow.
This is where most people make mistakes that cost them image quality they can't get back.
The worst thing you can do is this: JPEG → PNG → JPEG → WebP → JPEG. Every time you encode to a lossy format, you lose quality. The PNG step in the middle doesn't help — it preserves the already-degraded image, but the round-trip back to JPEG degrades it again.
Do this instead: Always go from your highest-quality source directly to your target format. One conversion, one step.
If you need to edit an image before converting it to its final format:
This ensures you only take the lossy compression hit once.
Don't use the same quality setting for every output:
After converting, actually look at the result. Open it at 100% zoom and compare it to the original. Pay attention to:
If you see problems, increase the quality setting and convert again. It's better to have a slightly larger file than a visibly degraded image.
After years of dealing with image formats, here are the mistakes I see most often:
PNG is lossless, but it can't restore data that JPEG already discarded. A 200KB JPEG converted to PNG will be a 500KB file that looks exactly like the 200KB JPEG — just stored less efficiently. You've made the file larger without any quality improvement.
A photograph saved as PNG can be 5-10x larger than the same photo as JPEG or WebP, with no visible quality benefit to the human eye. PNG's strength is sharp edges and flat colors (logos, screenshots, text), not the organic gradients of photographs.
In 2026, WebP is supported by over 97% of browsers. Chrome, Firefox, Safari, Edge, Opera — they all support it. The only holdouts are legacy browsers that almost nobody uses anymore. If you're still serving only JPEG and PNG on your website, you're sending files that are 25-35% larger than necessary.
JPEG at 100% quality produces files that are enormous but visually indistinguishable from 90% quality. The last 10% of JPEG quality increases file size dramatically while providing imperceptible visual improvement. Save that storage and bandwidth — use 85% and move on.
I've seen people convert their entire photo library from PNG to JPEG to save space, then delete the PNGs. Two years later, they need the lossless originals for a print project and they're gone. Always keep your originals. Hard drives are cheaper than regret.
A 10-second GIF can easily be 50MB. The same animation as MP4 or WebM might be 2MB. If your "GIF" is longer than 2-3 seconds, seriously consider using video format instead. Modern web pages can autoplay muted videos that look and behave exactly like GIFs.
For quick reference, here are the most common conversion paths and when they make sense:
PNG → JPG: When you need a smaller file and don't need transparency.
JPG → PNG: When you need to edit without further quality loss, or when you need a lossless archival copy.
PNG/JPG → WebP: When optimizing images for the web. Do this.
WebP → PNG/JPG: When you need compatibility with older software, email clients, or platforms that don't support WebP.
HEIC → JPG: When sharing iPhone photos with non-Apple users. The most common iPhone-related conversion.
SVG → PNG: When you need a raster version of a vector graphic at a specific size.
Any → AVIF: When you want maximum compression and can accept limited browser support.
GIF → MP4/WebM: When your animation is more than a few seconds long or the GIF file is unreasonably large.
Any → TIFF: When preparing images for professional printing.
Any → BMP: Almost never. BMP exists for legacy compatibility only.
This matters more than most people think.
When you use an online image converter, there are two architectures:
Server-side processing: Your image is uploaded to someone else's server, converted there, and the result is sent back to you. Your images pass through third-party infrastructure. You're trusting that company to not store, analyze, or misuse your images.
Client-side (in-browser) processing: Your image never leaves your computer. The conversion happens entirely in your browser using JavaScript. No upload, no server, no trust required.
For privacy-sensitive images — personal photos, business documents, client work, anything containing faces or identifying information — client-side processing is strongly preferable. It's not just about trust; it's about reducing attack surface. Data that never leaves your machine can't be intercepted, leaked, or breached.
Check the privacy policy of any converter you use. Better yet, use one that demonstrably processes everything locally. A good indicator: if the conversion works while your internet is disconnected, it's client-side.
The image format landscape is still evolving, and here's where it's heading:
WebP is the present. It's the pragmatic choice for web images right now, with near-universal support and meaningful compression advantages over JPEG and PNG.
AVIF is the near future. Browser support is growing steadily. Within a year or two, AVIF will be as universally supported as WebP is today. Its compression efficiency is remarkable, especially for photographic content.
JPEG XL was the ambitious future — but Google removed support from Chrome in 2023, effectively killing its adoption for web use. It still has niche applications in photography and archival, but it won't be a web standard anytime soon.
AI-generated images are creating new format considerations. These images often have different compression characteristics than photographs — they may have unnatural patterns, perfectly smooth gradients, or unusual color distributions that some codecs handle differently.
HDR (High Dynamic Range) is pushing format requirements forward. AVIF supports HDR natively; JPEG and PNG don't. As HDR displays become more common, this will become a more important consideration.
For now, the practical advice remains the same: WebP for the web, JPEG for maximum compatibility, PNG for lossless and transparency, SVG for vectors. Master these four and you'll handle 99% of real-world situations.
If you work with web development or deal with file uploads, here's a reference you'll appreciate:
| Format | Extensions | MIME Type |
|---|---|---|
| JPEG | .jpg, .jpeg | image/jpeg |
| PNG | .png | image/png |
| WebP | .webp | image/webp |
| AVIF | .avif | image/avif |
| GIF | .gif | image/gif |
| SVG | .svg | image/svg+xml |
| HEIC | .heic, .heif | image/heic |
| BMP | .bmp | image/bmp |
| TIFF | .tif, .tiff | image/tiff |
| ICO | .ico | image/x-icon |
Note that .jpg and .jpeg are identical formats — the three-letter extension is a holdover from the DOS era when file extensions were limited to three characters. Use whichever you prefer; they're the same thing.
Image format conversion sounds mundane, but getting it right saves you time, bandwidth, storage, and headaches. Here's the TLDR:
Know your formats. JPEG for photos, PNG for transparency and lossless, WebP for web, SVG for vectors, AVIF for bleeding-edge compression.
Always convert from the highest quality source. One conversion, direct to the target format.
WebP should be your default for the web. It's 2026. There's no good reason not to use it.
Keep your originals. Always. No exceptions.
Strip metadata before sharing images publicly, especially GPS coordinates.
Use client-side converters for privacy. Your images shouldn't need to visit someone else's server to change format.
Batch convert when migrating or optimizing. Test a few, then do the rest.
The tools to do all of this are free and available right in your browser. No software to install, no accounts to create, no subscriptions to maintain. Open a converter, drop your files in, and you're done. Now go fix those images.