image formats

The GIF Format Explained: Animation, Limits, and When to Use It

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The GIF format is the oldest image format still in everyday use, and it has survived for one reason: animation. A GIF can hold a short looping clip that plays anywhere, with no video player and no sound. That single trick kept GIF alive for more than thirty years. But the format also carries hard limits that make it the wrong choice for many jobs people still use it for. This guide explains what the GIF format is, where it works, where it does not, and how to work with GIF files.

In this guide

What the GIF format is

GIF, short for Graphics Interchange Format, dates from 1987. It stores an image, or a sequence of images, as a grid of pixels, and it is lossless, so it does not blur or smear the way a heavily compressed JPG can. The file extension is .gif.

Its standout feature is animation. A single GIF file can contain many frames and a timing instruction, so it plays as a short loop on its own. It is one of the formats covered in our wider guide to image file formats, and it is the only old format that handles motion.

The 256 colour limit

GIF has one limit that shapes everything else: a single GIF can contain at most 256 colours. A modern photo holds millions. When a photographic image is forced into 256 colours, smooth gradients break into visible bands, and the picture takes on a blotchy, posterised look.

This is why GIF works for a flat-colour logo animation or a simple icon, where 256 colours is plenty, and fails for a video clip or a photographic animation, where it looks rough and the file still ends up large. The colour limit is not a bug to work around. It is the line between what GIF does well and what it does badly.

Animated GIFs and what they cost

An animated GIF is convenient because it plays everywhere with no effort. The cost is weight. Because GIF compresses poorly compared with modern formats, a few seconds of animation can produce a file of several megabytes.

Picture a short five second product animation. As a GIF it might land near 4 MB, enough to slow a page noticeably on a phone. The same clip in a modern format can drop below 1 MB and look better doing it. On a busy page, a single heavy GIF can outweigh every other image combined.

GIF vs WebP vs MP4 for animation

For animation on your own website, GIF is rarely the best option today. Two alternatives beat it.

An animated WebP keeps full colour and compresses far better, so it looks sharper and weighs a fraction of a GIF. A short MP4 video is smaller still and is the right choice for anything longer or more detailed. GIF holds on mainly because some chat apps, messaging platforms, and older systems expect it specifically. When a platform asks for a GIF, give it one. When you control the page, reach for WebP or MP4 instead.

How to extract frames from a GIF

Sometimes you do not want the animation, you want one picture out of it: a single clean frame to use as a thumbnail, to edit, or to check a detail. The GIF frame capture tool separates an animated GIF into its individual frames so you can save the exact one you need.

It runs in your browser, processes the file on your own device, and asks for no account. Drop the GIF in, and every frame is laid out for you to pick from.

How to confirm a file is a GIF

A file named clip.gif is not always a GIF. Files get renamed and re-saved, and the extension can describe something the data is not, which causes uploads and editors to fail.

The GIF format checker reads the real file data and tells you whether the file is genuinely a GIF. If you need to produce a GIF from a bitmap image, the BMP to GIF converter handles that conversion.

When GIF is still the right choice

GIF earns its place in a few specific cases. Use it for a simple, flat-colour animation, such as an animated icon or a short looping graphic with few colours. Use it when a platform or piece of software explicitly requires a GIF and will not accept WebP or MP4. And use it for a tiny looping clip where guaranteed compatibility matters more than file size.

For anything photographic, anything longer than a few seconds, or anything on a page where speed matters, a modern format will serve you better.

Free GIF tools used in this guide

Frequently asked questions

Why do GIF files look grainy?

A GIF can hold only 256 colours. When a photographic image is forced into that limit, smooth gradients break into visible bands and the picture looks blotchy.

Why is my GIF file so large?

GIF compresses poorly compared with modern formats. A few seconds of animation can produce a file of several megabytes, where an animated WebP or MP4 of the same clip would be much smaller.

Should I use GIF or WebP for animation?

For your own website, WebP. An animated WebP keeps full colour, looks sharper, and weighs far less. Use GIF only when a platform specifically requires it.

Can I get a still image out of an animated GIF?

Yes. The GIF frame capture tool separates a GIF into its individual frames so you can save the exact one you want.

Does GIF lose quality like JPG?

No. GIF is lossless, so it does not blur or smear. Its weakness is the 256 colour limit, not lossy compression.

BMP Files: What They Are and How to Convert Them Free

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BMP files have one defining trait: they are huge. A 1920 by 1080 image saved as a BMP weighs around 6 MB. The same picture as a JPG drops to roughly 300 KB, and as a WebP, closer to 150 KB. That single fact explains almost everything about BMP, where it came from, why it is rarely used today, and why the usual job with a BMP is converting it into something smaller. This guide explains what BMP files are and how to convert them, free and in your browser.

In this guide

What a BMP file is

BMP, short for bitmap, is an image format Microsoft introduced for early versions of Windows. It stores a picture in the most direct way possible: a grid of pixels, with the colour of every single pixel written out in full. The file extension is .bmp.

That direct approach makes BMP simple and reliable. Any program can read it without guesswork. It is one of the formats covered in our wider guide to image file formats, and it sits at the opposite end of the scale from a format like WebP. Where WebP works hard to make files small, BMP does no real compression at all.

Why BMP files are so large

A modern format looks at a photo and finds shortcuts. A stretch of blue sky is thousands of nearly identical pixels, so JPG or WebP store that region compactly instead of repeating the same value over and over. BMP does not look for shortcuts. It writes every pixel at full size, sky and all.

The result is a file 20 to 50 times larger than the same image in a compressed format. A desktop wallpaper that would be 400 KB as a JPG can reach 15 MB or more as a BMP. That weight is the reason you almost never want to keep an image as a BMP, send one by email, or put one on a web page.

Where you still run into BMP files

If BMP is so heavy, why does it still turn up? Because some software never moved on. Older Windows programs, certain scanners, some industrial and medical imaging devices, and a few specialised tools still produce BMP files by default.

So a BMP usually lands on your desk from somewhere else: a scan, an export from a legacy application, a file a colleague sends from an old system. You rarely choose to create one. The task is almost always the same, turn it into a smaller, more portable format.

Which format to convert a BMP to

The right target depends on what the image is and where it is going.

  • PNG if the image is a graphic, a screenshot, or line art, or if it needs a transparent background. PNG is lossless, so sharp edges stay crisp.
  • JPG if the image is a photograph headed for email or the web and you want a small file. JPG compresses photos efficiently.
  • WebP if file size matters most. WebP produces the smallest result of the common formats and works in every current browser.
  • GIF only if a specific platform or piece of software asks for a GIF. It is limited to 256 colours and is rarely the best choice otherwise.

How to convert a BMP file

Pick the converter that matches your target and drop the BMP onto it. Each tool runs in your browser, processes the file on your own device, and asks for no account.

Conversion is a one-way step. The new file is what you will use, but keep the original BMP until you have checked the result looks right, especially if you converted to a lossy format like JPG.

How to confirm a file is really a BMP

A file named scan.bmp is not always a BMP. Files get renamed and re-saved, and the extension can end up describing something the data is not. If a converter rejects your file, a format mismatch is a likely cause.

The BMP format checker reads the actual file data and confirms whether it is genuinely a BMP, so you know which converter you really need before you start.

Quick reference

Your goalConvert BMP to
Keep graphics and edges losslessPNG
Small photo for web or emailJPG or JPEG
Smallest possible web fileWebP
A platform that requires GIFGIF

Frequently asked questions

Why is my BMP file so large?

BMP stores every pixel at full size with no real compression. That makes it 20 to 50 times larger than the same image as a JPG or WebP.

What should I convert a BMP to?

PNG for graphics and transparency, JPG for photographs, WebP for the smallest web file. GIF only if a platform specifically requires it.

Does converting a BMP lose quality?

Converting to PNG keeps every pixel exactly. Converting to JPG or lossy WebP discards a small amount of detail once, in exchange for a much smaller file. The BMP itself loses nothing in the process, so keep the original until you are happy with the result.

Can I open a BMP file without special software?

Yes. Almost every image viewer and browser can open a BMP. The problem is its size, not its compatibility, which is why converting it is usually worthwhile.

Is my file uploaded when I convert it?

No. These converters run inside your browser. The file is processed on your own device and is never sent to a server.

WebP Format Explained: Why It Is the Best Image Format for the Web

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WebP format is Google’s answer to a simple problem: images on the web are too heavy. A WebP file is usually 25 to 35 percent smaller than the same photo as JPG, and smaller than PNG for graphics, with no visible drop in quality. This article explains what the WebP format is, why Google built it, how it compares to JPG and PNG, when to use it, and how to check, compress, and edit WebP files. It goes deeper on one format from our wider guide to image file formats.

In this guide

What the WebP format is

WebP is an image format Google released in 2010 and has refined ever since. It is designed for one job: showing images on web pages using as few bytes as possible. The file extension is .webp.

What makes WebP unusual is range. JPG handles photographs but cannot do transparency. PNG handles graphics and transparency but produces large files. GIF handles animation but only 256 colours. WebP does all of it: photographs, graphics, transparency, and animation, in a single format. That is why it has become the default recommendation for web images.

Why Google created WebP

Google measures the web for a living, and one number kept growing: page weight. Images are the largest part of most pages, often more than half the total bytes a visitor downloads. Heavier pages load slower, and slower pages lose visitors and rank lower in search.

JPG and PNG were designed in the early 1990s. They are reliable, but their compression is old. Google built WebP to compress the same image far harder while keeping it looking the same, so a page could carry the same pictures at a fraction of the download cost. For a business, that is faster pages, lower bandwidth bills, and a small but real ranking benefit, since page speed is part of how Google ranks results.

How much smaller WebP files are

The savings are large enough to notice on a real page. Picture an online store with a product gallery of twelve photos, each one an 800 KB JPG. That gallery is 9.6 MB. Re-saved as WebP at the same visible quality, the same twelve images land near 3 MB. The page that took eight seconds on a phone now takes under three.

As a rough guide, expect a WebP file to be 25 to 35 percent smaller than the equivalent JPG, and around 26 percent smaller than a PNG for the same graphic. The exact figure depends on the image, but WebP wins almost every time.

WebP does both lossy and lossless

Most formats pick a side. JPG is always lossy, it throws away detail to shrink the file. PNG is always lossless, it keeps every pixel and stays larger. WebP offers both modes in one format.

Lossy WebP is the choice for photographs, where discarding a little invisible detail is a fair trade for a much smaller file. Lossless WebP is the choice for logos, screenshots, and flat-colour graphics, where sharp edges must stay crisp. You pick the mode that matches the image, and in both cases the result is smaller than the older format it replaces.

Transparency: WebP vs PNG

Transparency is the see-through background that lets a logo sit cleanly on any colour. For years PNG was the only practical way to get it. WebP supports transparency too, and it does so at a much smaller size.

A transparent logo that is 180 KB as a PNG is often near 60 KB as a WebP, with the edges just as clean. If a site uses transparent graphics in its header, footer, and product images, switching them to WebP trims real weight from every page without any visible change.

Animation: WebP vs GIF

WebP can also hold short animations, the same looping clips GIF is known for. The difference is quality and size. GIF is locked to 256 colours, so a photographic animation looks blotchy, and GIF files are large. Animated WebP keeps full colour and compresses far better.

A short product animation that is 4 MB as a GIF can drop below 1 MB as an animated WebP, and it will look better doing it. GIF still has a place where a platform specifically expects it, but for animation on your own site, WebP is the lighter choice.

Browser support: is WebP safe to use

This used to be the reason people hesitated, and it no longer applies. Every major browser, Chrome, Firefox, Safari, and Edge, has supported WebP since 2020. In practice that covers almost every visitor who will reach your site today.

You can use WebP as your default web image format with confidence. The old advice to keep a JPG fallback is now only relevant if you must support browsers that are many years out of date.

When not to use WebP

WebP is the right default for the web, but it is not the right format everywhere. Three cases call for something else.

For images that will be printed or sent to a print shop, stick with the format the printer asks for, usually a high-quality JPG or TIFF. For a logo that must scale to any size, from a favicon to a banner, a vector SVG stays sharp where any pixel format, WebP included, would blur. And for a file you are handing to someone on much older software, a plain JPG or PNG removes any risk that their program cannot open it.

How to check if a file is WebP

A file named image.jpg is not always a JPG. Files get renamed, downloaded, and re-saved, and the extension can end up describing something the data is not. When an upload fails or an editor rejects a file, a format mismatch is a common cause.

The reliable way to know is to read the file data itself. The WebP format checker confirms in one step whether a file really is WebP. For a closer look at a WebP file, its dimensions, whether it uses lossy or lossless mode, and whether it has transparency, the WebP analyzer reports the details.

How to compress and optimise WebP

WebP is already efficient, but a WebP file straight out of an export is rarely as small as it could be. Two tools tighten it further.

The WebP compressor shrinks a WebP file while keeping it usable, which is the quick option when you just need a lighter file. The change WebP quality tool gives you precise control, letting you set the exact quality level and watch the size change, so you can find the point where the file is small but still looks right. If you are pulling a WebP out of code or a data string, the Base64 to WebP converter turns an encoded string back into a real file.

How to edit a WebP file

You do not need to convert a WebP back to another format just to make a small edit. Several tools work on WebP files directly. The blur WebP tool softens a file or part of it, the change WebP color tool adjusts its colour, and the change WebP opacity tool makes the whole image more or less transparent.

All of these run in the browser. The file is processed on your own device, nothing is uploaded to a server, and there is no sign-up. If you have a BMP that needs to become a WebP, the BMP to WebP converter handles that, and the full set lives in the WebP tools category.

Free WebP tools used in this guide

Frequently asked questions

Is WebP better than JPG?

For the web, yes. A WebP file is usually 25 to 35 percent smaller than the same JPG at the same visible quality, and it can also do transparency and animation, which JPG cannot. For print or for very old software, a JPG is still the safer choice.

Do all browsers support WebP?

Every major browser, Chrome, Firefox, Safari, and Edge, has supported WebP since 2020. It is safe to use as a default web image format today.

Does WebP lose quality?

It depends on the mode. Lossy WebP discards a small amount of detail to save space, like JPG. Lossless WebP keeps every pixel, like PNG. You choose the mode that suits the image.

Can WebP have a transparent background?

Yes. WebP supports transparency, and a transparent WebP is usually much smaller than the same image as a transparent PNG.

How do I know if a file is really WebP?

Do not trust the file extension, since it can be renamed. Use a checker that reads the file data, such as the WebP format checker linked above.

The Ultimate Guide to Image File Formats: PNG, JPG, WebP, AVIF and More

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Image file formats are the difference between a web page that loads in two seconds and one that takes eight. A 4.2 MB hero image can add six seconds on mobile data, and the fix is rarely a faster server, it is usually a different format. The format you pick decides three things at once: how large the file is, how sharp it looks, and where it will open. This guide explains the main image file formats, when to use each one, how to identify what you already have, and how to convert between them without losing quality.

In this guide

Lossy vs lossless: the core idea

Every image format is either lossy or lossless, and that single property predicts most of its behaviour.

Lossy formats throw away data to shrink the file. JPG is the classic example. Each time you save a JPG, the format discards detail the human eye is unlikely to notice. The file gets small, but the loss is permanent. Save the same JPG ten times and you can watch it degrade.

Lossless formats keep every pixel exactly. PNG is the common example. A screenshot saved as PNG looks identical to the original, and you can edit and resave it without decay. The trade is size: lossless files are usually larger.

The practical rule: photographs tolerate lossy compression well, because their detail is noisy and irregular. Graphics with flat colour, sharp edges, or text (logos, screenshots, charts) suffer visibly under lossy compression, so they want lossless.

JPG: built for photographs

JPG (also written JPEG) has been the default photo format since the 1990s. It compresses photographs efficiently and opens on every device, browser, and printer made in the last 25 years.

Reach for JPG when the image is a photograph and you do not need transparency. A travel photo, a product shot on a white background, a portrait: all of these are good JPG candidates. A typical 12-megapixel photo that is 6 MB as a camera file drops to roughly 1.5 MB as a quality-80 JPG with no obvious difference.

Avoid JPG for screenshots, logos, line art, or anything with text. The lossy compression smears the sharp edges and leaves grey fuzz around letters. Avoid it too for any image that needs a transparent background, because JPG cannot store transparency at all.

PNG: graphics and transparency

PNG is lossless, so it keeps sharp edges crisp and supports a transparent background. That makes it the right choice for logos, icons, screenshots, charts, and any graphic you plan to place on top of another image or a coloured page.

If a designer hands you a logo that must sit on both a white header and a dark footer, it needs a transparent background, and PNG delivers that. Not sure whether a file actually has transparency? The image transparency checker tells you in one step, which saves the surprise of a white box appearing behind your logo.

The cost of PNG is size. A full-screen photograph saved as PNG can be five to ten times larger than the same photo as JPG. Use PNG for graphics, not for photos.

WebP: the modern web default

WebP is a format Google released specifically to make web pages lighter. It does something the older formats cannot: it offers both a lossy mode and a lossless mode, and it supports transparency and animation. In practice a WebP file is usually 25 to 35 percent smaller than the equivalent JPG, and smaller than PNG for the same graphic.

For a website, WebP is now the sensible default. A 4.2 MB PNG hero image re-saved as WebP would land near 600 KB with no visible loss, turning a six-second mobile load into well under two seconds. Every current browser supports WebP, so the old compatibility worry no longer applies.

The site has a dedicated WebP tools category for working with the format, and you can confirm whether a file is already WebP with the WebP format checker.

GIF: animation and its limits

GIF is old, and it shows. Its headline feature is animation, short looping clips with no sound. Its hard limit is colour: a GIF can hold only 256 colours total. That is fine for a simple animated icon or a flat-colour loop, but a photographic animation turns blotchy and the file balloons in size.

For a short animation today, an animated WebP or a small MP4 video will look better and weigh far less than a GIF. GIF still matters because some platforms and chat apps expect it. If you need to pull the individual frames out of a GIF, for example to edit one frame, the GIF frame capture tool separates them for you.

BMP: uncompressed and oversized

BMP stores an image with little or no compression. Every pixel is written out in full, so a BMP of a photo can be 20 to 50 times larger than the same photo as JPG. A simple desktop wallpaper can reach 25 MB as a BMP.

You almost never want to publish a BMP. It exists mostly because older Windows software, some scanners, and certain industrial and medical devices still produce it. When a BMP lands on your desk, the job is usually to convert it into something smaller and more portable:

You can confirm a file really is a BMP first with the BMP format checker.

AVIF: next-generation compression

AVIF is the newest mainstream format. It compresses harder than WebP, often producing a file 50 percent smaller than JPG at the same visible quality, and it handles a wider range of colour. For a photo-heavy page where every kilobyte counts, AVIF is the strongest option available today.

The trade is maturity. Browser support is good but slightly behind WebP, and encoding an AVIF takes longer. A common professional approach is to serve AVIF to browsers that accept it and fall back to WebP for the rest. If you are choosing one safe format for a site right now, WebP is still the easier call. If you are optimising aggressively and can manage a fallback, AVIF wins on size.

SVG: graphics that never blur

Every format above stores an image as a grid of pixels. SVG does not. It stores a set of drawing instructions: lines, curves, and shapes described by maths. Because it is instructions rather than pixels, an SVG scales to any size with zero blur. The same logo file looks razor sharp on a phone icon and on a billboard.

SVG is the right choice for logos, icons, and simple illustrations with flat colour. It is the wrong choice for photographs, which have no clean shapes to describe and would produce a huge, useless file. The quick test: if you could draw it with a pen in clean lines, SVG suits it. If it is a photo, it does not.

HEIC: the iPhone format

Recent iPhones save photos as HEIC by default. HEIC compresses better than JPG, so the photo takes less space on the phone. The friction starts when you move that file somewhere else: many Windows programs, older software, and some websites will not open a HEIC file.

If someone emails you a HEIC photo and your software refuses it, the file is fine, it just needs converting to a format the receiving program understands, usually JPG for a photo or PNG if you need transparency.

How to tell what format you have

A file extension can lie. Someone renames photo.webp to photo.jpg and now the name says one thing while the actual data says another. That mismatch causes uploads to fail and editors to throw errors. The reliable way to know is to inspect the file data itself, not the name.

Each of these checkers reads the real file signature and tells you the truth:

How to convert and shrink images

Once you know what you have and what you need, two jobs cover most cases: converting the format and reducing the size.

For converting, pick the tool that matches your starting format and target, such as the BMP converters listed above. For reducing size without changing format, the image compressor shrinks a file while keeping it usable, and the change image quality tool lets you trade a precise amount of quality for a smaller file. If you work with images embedded in code or data, the Base64 to image converter turns an encoded string back into a real file.

Every one of these runs in the browser. The image is processed on your own device, nothing is uploaded to a server, and there is no sign-up. The full set lives in the image tools category.

Free image tools used in this guide

Quick reference table

FormatTypeTransparencyAnimationBest for
JPGLossyNoNoPhotographs
PNGLosslessYesNoGraphics, screenshots, logos
WebPBothYesYesThe web, as a default
AVIFBothYesYesAggressive web optimisation
GIFLosslessYesYesSimple flat-colour animation
BMPUncompressedNoNoLegacy software output
SVGVectorYesYesLogos, icons, illustrations
HEICLossyNoNoiPhone photo storage

Frequently asked questions

Which image format is best for a website?

WebP, as a default. It is smaller than JPG and PNG, supports transparency and animation, and works in every current browser. Use AVIF if you are optimising hard and can set up a fallback.

Should I use JPG or PNG for a photo?

JPG. It compresses photographs far smaller with no visible loss. Keep PNG for graphics, screenshots, and anything that needs transparency.

Does converting between formats lose quality?

Converting into a lossless format (PNG, BMP) keeps everything. Converting into a lossy format (JPG, WebP lossy) discards some detail once. Converting a JPG to PNG will not restore detail the JPG already removed.

Why will my HEIC file not open?

The file is valid, but many non-Apple programs do not read HEIC. Convert it to JPG or PNG and it will open anywhere.

How do I know a file’s real format?

Do not trust the extension, since it can be renamed. Use a checker that reads the file data, such as the format checkers linked above.