What is an image compressor and how does it work?

An image compressor rewrites an image file so it takes up less space. There are two ways to do it. Lossy compression throws away fine detail that is hard to see, which is how JPG and WebP get files 60% to 90% smaller. Lossless compression stores the same pixels using a more efficient method, which is how PNG saves space without changing a single pixel. This tool gives you both. JPG and WebP use a quality slider from 10 to 100. PNG starts in lossless mode and can switch to a lossy palette mode. GIF uses a palette from 2 to 256 colors. You can also skip the sliders and type a target size in KB or MB instead. The work happens in your browser using the Canvas API and WebAssembly, so no file is sent anywhere. Output downloads straight from the browser to your device.

How do I compress an image to exactly 100KB or 1MB?

Open the Compression section, find the Target file size field, type your number, and set the unit to KB or MB. The compressor makes up to 8 passes at progressively lower quality settings, checking the output size after each one. If it still cannot fit the limit, it makes up to 6 more passes that scale the pixel dimensions down as well. The result is a file at or under the size you asked for. Very large images with a very small target may not fit, and in that case you get the smallest file the tool could produce rather than a failure. Common targets like 100KB, 200KB, 500KB, and 1MB also have their own dedicated pages if you want to skip the setup.

Which image formats does the image compressor support?

JPG, JPEG, PNG, WebP, BMP and GIF work as both input and output. Each format gets controls that fit it. JPG and JPEG use the quality slider, where 75 to 85 is the usual range for web images, plus a progressive encoding toggle. PNG uses lossless mode by default, with an optional palette slider from 2 to 256 colors and a dithering toggle. WebP takes the quality slider and often lands 25% to 35% smaller than a JPG that looks the same. GIF gets a 2 to 256 color palette control. BMP output is uncompressed by design, so use it only when a specific program needs it. Leave the output format on Original to compress without converting, or pick a different format to compress and convert in one step.

Will compressing an image lower its quality?

It depends on the mode you choose. In lossless PNG mode the pixels do not change at all, so there is no quality loss. In lossy mode there is some loss, but how much you see is up to you. At quality 85 to 95, JPG and WebP output usually looks the same as the original on a screen while the file drops 40% to 70%. At quality 75 to 85 the file gets much smaller and the difference stays hard to spot in photos. Below quality 50 you start to see blocky patches in smooth areas like skies and skin. Use the side by side preview to check the result before downloading. Photos with fine gradients need a higher setting than photos with lots of texture.

How much can I reduce my image file size?

Typical reductions run from 20% to 90%, and the format and content decide where you land. A camera JPG at quality 80 usually drops 60% to 80%. A PNG photo converted to JPG or WebP often drops 70% to 90%, because PNG is a poor fit for photographic detail in the first place. A PNG icon or screenshot in lossless mode drops 10% to 30%, and dropping the palette to 64 colors can take it much further. Animated GIFs shrink most when you cut the color palette or switch the output to WebP. Resizing multiplies all of this: halving the dimensions removes about three quarters of the pixels before compression even starts. Each row in the editor shows your actual saving as a percentage.

Are my files uploaded to a server?

No. Every image stays on your device from start to finish. The compressor runs on your browser's own JavaScript engine, Canvas API, and WebAssembly, so files are never sent to a server, never stored in a database, and never seen by anyone else, including us. You can check this yourself: open your browser's developer tools, switch to the Network tab, and compress an image. You will see no file upload. This makes the tool safe for client photos, unreleased product shots, ID documents, medical scans, and anything covered by an NDA or a data-handling policy like GDPR or HIPAA.

Can I compress multiple images at once?

Yes. Add several files and your settings for quality, target size, output format, resize, metadata, and filename suffix apply to all of them. Each file gets its own row showing the original size, the compressed size, and the percentage saved, so nothing is hidden in a summary. Files are processed with Web Workers where your browser supports them, which keeps the page responsive while a batch runs. A single file downloads on its own. Two or more download together as picssizer_compressed.zip, with the original filenames kept so you can match every result to its source. For larger sets, the dedicated Bulk Image Compressor gives you the same controls in a layout built for long lists.

Is there a file size limit for compressing images?

There is no fixed cap set by the tool, and no per-day or per-file quota. The real limit is your device's memory, because compression runs locally instead of on a server. A laptop with 8GB of RAM handles large photo files comfortably, including 30 to 50 megapixel exports. Browsers also cap the pixel area an image canvas can hold, which is around 16384 by 16384 pixels on most devices, so extremely large inputs get scaled down before compression. If a very big batch feels slow, split it into smaller groups.

Do I need an account to use the image compressor?

No. There is no signup, no email, no login, and no payment. Nothing is limited behind a plan. You get the full set of controls right away. That includes the quality slider, target file size, resize with four fit modes, and PNG and GIF palette settings. It also includes format conversion, a background color for transparent images, metadata stripping, progressive JPEG, and the filename suffix. Compressed files download without a watermark, and there is no limit on how many images you compress.

Which quality setting should I pick?

The quality slider runs from 10 to 100 and starts at 75, which suits most web images. For hero images and portfolio photos, try 85 to 90. For blog images and product thumbnails, 75 to 85 keeps files small with little visible change. For a photo that only needs to fit a size limit, skip the slider and use the target file size field instead, since the tool will find the quality level for you. For icons, logos, and screenshots, keep PNG lossless mode on, and only turn it off if you need a much smaller file. Compare a couple of settings in the preview before you commit to a batch.

Can I resize an image while compressing it?

Yes. The Resize section has three modes. None keeps the original dimensions. Max dimension caps the longest side at a pixel value, with 1920px as the default, and leaves smaller images unchanged. Percentage scales down by any value from 1% to 100%. When resizing is active you also get a fit mode: Fit keeps the aspect ratio, Contain adds letterbox bars to reach the target box, Cover fills the box and crops what hangs over, and Stretch ignores the ratio. Resizing and compression run in the same pass, so combining a smaller dimension with a target file size gives you the biggest reduction.

Will a transparent PNG lose transparency when I save it as JPG?

JPG cannot store transparency, so the transparent pixels have to be filled with something. When you set the output format to JPG, a Background color picker appears in the Compression section. White is the default, and you can type any hex code or pick a preset. Transparent areas come out in that color and the rest of the image is unchanged. If you need transparency in the output, choose PNG or WebP instead, since both keep the alpha channel intact.

Does the image compressor remove EXIF and GPS data from photos?

Yes. Strip metadata sits under Advanced and is on by default, so EXIF fields are removed as the file is compressed. That covers GPS coordinates, camera make and model, lens details, and the capture date and time. It also removes the embedded color profile, which is why the file ends up slightly smaller. Turn the toggle off when you need that data kept, for example when a client needs the shooting details or a print workflow depends on the color profile. Nothing is added back later, so the downloaded file matches exactly what the toggle says.

Can I compress an animated GIF and keep the animation?

Yes, with two paths. Keep the output format as GIF or Original and lower the color palette using the slider, which runs from 2 to 256. Fewer colors means a smaller file, and the frames stay intact. The other option is to set the output format to WebP, which supports animation and usually produces a smaller file than GIF at similar quality, so you get an animated WebP file. Choosing JPG, PNG, or BMP flattens the animation to a single frame, and the editor shows a warning before you export so the loss is never a surprise.

What do the compressed files look like when I download them?

Each file keeps its original name with a suffix added, set to _compressed by default, which you can change or clear in the Advanced section. The extension matches your chosen output format, or the input format if you left it on Original. One file downloads directly. Two or more arrive as picssizer_compressed.zip holding all the results under their original names. Before downloading, each row shows the old size, the new size, and the percentage saved, and the preview button opens a side by side view so you can compare the compressed image against the source.

Free Image Compressor for JPG, PNG, WebP and GIF

Compress images to a target size in KB or MB, resize them, and download in seconds. Everything runs inside your browser, so your files are never uploaded.

or drag and drop your image here

Supports JPG, JPEG, PNG, WEBP, BMP, GIF

Paste an image (Cmd/Ctrl+V)

Compress to a Target KB or MB SizeResize by Max Dimension or PercentageQuality Slider From 10 to 100JPG, PNG, WebP, GIF and BMPStrip EXIF, GPS and TimestampsBackground Color for Transparent PNGsProgressive JPEG OutputFiles Stay Private on Your DeviceNo Uploads and No Signup

All compression runs on your device, not on a serverNo file uploads and no server storageCompress a batch of images and download them as one ZIP

What Is an Image Compressor?

An image compressor is a tool that makes an image file smaller. It does this by storing the same pixels more efficiently, or by dropping fine detail that is hard to notice on a screen. The first approach is lossless, used by PNG and WebP, and the pixels stay identical. The second is lossy, used by JPG and WebP, and it trades a little detail for a much smaller file. The PicsSizer image compressor gives you both modes and runs entirely in your browser through the Canvas API and WebAssembly, so your files are never uploaded. It handles JPG, JPEG, PNG, WebP, BMP and GIF as both input and output. The controls include a quality slider from 10 to 100, a target file size in KB or MB, palette settings for PNG and GIF, resizing with four fit modes, and EXIF stripping that is on by default.

What People Compress Images For

Website Speed

Cap hero images at 1920px on the longest side
Get blog photos under 200KB for faster pages
Convert PNG screenshots to WebP for smaller files
Improve Largest Contentful Paint on image-heavy pages

Social Media and Uploads

Scale photos down to 1080px for feed posts
Meet a 100KB or 1MB limit on an upload form
Save a transparent PNG as JPG on a white background
Remove GPS location data before you share a photo

Product Photos

Compress product shots to a fixed KB size
Batch compress a full catalog into one ZIP file
Convert PNG product images to WebP or JPG
Add a _compressed suffix so originals stay untouched

How the Image Compressor Works

1
Add Your Images
Drag and drop your files or pick them from your device. The compressor accepts JPG, JPEG, PNG, WebP, BMP and GIF, either one file or a batch.
2
Set Quality or a Target Size
Move the quality slider between 10 and 100, or type a target file size in KB or MB. You can also resize, pick an output format, strip EXIF data, and choose a background color for transparent areas.
3
Download the Smaller File
Each file shows its old size, new size, and the percentage saved. Open the side by side preview to compare, then download. One file saves on its own and a batch saves as a single ZIP.

How This Image Compressor Reduces JPG, PNG, WebP and GIF File Size

The PicsSizer image compressor re-encodes your image with settings you control, so the file gets smaller while the picture still looks right. JPG and WebP use a quality slider from 10 to 100. PNG has a lossless mode that keeps every pixel exact, plus a lossy mode that cuts the color palette down to as few as 2 colors. GIF has its own palette control from 2 to 256 colors. You can also set a target file size in KB or MB and let the tool work down to it. Most online image compressors send your file to a server first. This one does not. Compression runs in your browser through the Canvas API and WebAssembly, so the image never leaves your device.

Compress an Image to a Target File Size

Open the Compression section, type a number in the Target file size field, and pick KB or MB. The compressor then makes up to 8 passes at lower quality levels. If the file is still too big, it makes up to 6 more passes that also scale the dimensions down. This is the fastest way to hit a hard limit, like a 100KB photo cap on an application form or a 1MB attachment rule. If the limit cannot be reached, you get the smallest result the tool could produce instead of an error.

Resize While You Compress

Resizing cuts file size faster than quality alone, so the two controls sit side by side. Pick Max dimension to cap the longest side at a pixel value, with 1920px as the default. Images already smaller than that are left alone. Pick Percentage to scale down by any amount from 1% to 100%. Four fit modes control the shape of the result: Fit keeps the aspect ratio, Contain adds letterbox bars, Cover fills the box and crops the overflow, and Stretch ignores the ratio.

Save a Transparent PNG as JPG With Your Own Background Color

JPG files cannot store transparency. When you set the output format to JPG, a Background color picker appears and the transparent pixels get filled with the color you choose. White is the default, and you can enter any hex value or pick from the presets. Use a dark fill for photos on dark pages, or a brand color for product images. PNG and WebP output keeps transparency exactly as it was.

Strip EXIF, GPS and Timestamp Metadata

Phone cameras write extra data into every photo, including GPS coordinates, camera model, and the date and time of the shot. Strip metadata is turned on by default under Advanced, so this data is removed during compression and the file gets a little smaller too. It also removes the embedded color profile. Turn the toggle off if you need to keep the profile or copyright fields for a print or client workflow.

Progressive JPEG Output

A progressive JPEG loads in passes. Viewers see a rough version of the whole image first, then it sharpens as more data arrives. On slow connections this feels faster than watching a normal JPEG paint from the top down. The Progressive JPEG toggle is on by default and shows up under Advanced whenever the output is JPG.

PNG and GIF Palette Controls

PNG output starts in lossless mode, which keeps every pixel identical and still trims the file. Turn lossless off and two more controls appear: a color palette slider from 2 to 256, and a dithering toggle that blends colors to hide banding in gradients. GIF output has the same 2 to 256 palette slider. Cutting colors is the main way to shrink a PNG icon, a screenshot, or an animated GIF, since flat areas of color compress much better with a smaller palette.

Compress a Batch of Images at Once

Add several files and the compressor applies your quality, format, resize, and metadata settings to all of them. Every row lists the original size, the new size, and the percentage saved, so you can spot a file that needs different settings. A single file downloads on its own with your filename suffix applied. Two or more files download together as picssizer_compressed.zip with the original filenames kept, so you can match each result back to its source.

Why Use This Image Compressor

Your images stay on your device, which matters for client photos, ID documents, and unreleased product shots. You control the trade-off instead of accepting one fixed preset: a 10 to 100 quality slider, a target size in KB or MB, palette controls for PNG and GIF, and four resize fit modes. Input and output both cover JPG, JPEG, PNG, WebP, BMP and GIF, so compressing and converting happen in one step. There is no signup, no watermark on the output, and no cap on how many images you compress.

Who Uses the Image Compressor

Web developers cutting page weight to improve Core Web Vitals. Bloggers and marketers getting photos under a size limit before upload. Store owners compressing product catalogs in batches. Photographers making web previews while keeping their master files untouched. Job applicants and students fitting a photo or scan into a 100KB or 200KB form limit. Anyone who wants EXIF and GPS data gone before a photo gets shared.

What You Get in Every Compression

A before and after file size with the percentage saved on each row. A side by side preview so you can check the result before you download. Your choice of output format, including keeping the original. A filename suffix, set to _compressed by default, so compressed files never overwrite your originals. Metadata stripping and progressive JPEG encoding turned on by default, which you can switch off at any time.

Common Ways to Compress Images

For web pages, cap the longest side at 1920px and use JPG or WebP at quality 75 to 85. For upload forms with a hard limit, set the target file size to 100KB, 200KB, 500KB, or 1MB and let the tool find the quality level. For icons, logos, and screenshots, keep PNG and use lossless mode, or turn lossless off and drop the palette to 64 colors. For email attachments, resize to 50% and strip metadata. For animated GIFs, lower the palette or switch the output to WebP, which keeps the animation and usually produces a smaller file.

Add a file above, set a quality level or a target size in KB or MB, and download the smaller version. No account needed, and nothing gets uploaded.

More Image Tools

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Image Compressor FAQs

Answers about settings, supported formats, and what the output files look like

Still have questions? Contact our support team

Free Image Compressor for JPG, PNG, WebP and GIF

What Is an Image Compressor?

What People Compress Images For

Website Speed

Social Media and Uploads

Product Photos

How the Image Compressor Works

Add Your Images

Set Quality or a Target Size

Download the Smaller File

How This Image Compressor Reduces JPG, PNG, WebP and GIF File Size

Compress an Image to a Target File Size

Resize While You Compress

Save a Transparent PNG as JPG With Your Own Background Color

Strip EXIF, GPS and Timestamp Metadata

Progressive JPEG Output

PNG and GIF Palette Controls

Compress a Batch of Images at Once

Why Use This Image Compressor

Who Uses the Image Compressor

What You Get in Every Compression

Common Ways to Compress Images

More Image Tools

Image Resizer

JPEG Compressor

PNG Compressor

Image Converter

Compress to 100KB

Compress to 200KB

Compress to 500KB

Compress to 1MB

Image Compressor FAQs

1What is an image compressor and how does it work?

What is an image compressor and how does it work?

2How do I compress an image to exactly 100KB or 1MB?

How do I compress an image to exactly 100KB or 1MB?

3Which image formats does the image compressor support?

Which image formats does the image compressor support?

4Will compressing an image lower its quality?

Will compressing an image lower its quality?

5How much can I reduce my image file size?

How much can I reduce my image file size?

6Are my files uploaded to a server?

Are my files uploaded to a server?

7Can I compress multiple images at once?

Can I compress multiple images at once?

8Is there a file size limit for compressing images?

Is there a file size limit for compressing images?

9Do I need an account to use the image compressor?

Do I need an account to use the image compressor?

10Which quality setting should I pick?

Which quality setting should I pick?

11Can I resize an image while compressing it?

Can I resize an image while compressing it?

12Will a transparent PNG lose transparency when I save it as JPG?

Will a transparent PNG lose transparency when I save it as JPG?

13Does the image compressor remove EXIF and GPS data from photos?

Does the image compressor remove EXIF and GPS data from photos?

14Can I compress an animated GIF and keep the animation?

Can I compress an animated GIF and keep the animation?

15What do the compressed files look like when I download them?

What do the compressed files look like when I download them?