How to use the Image Compressor
Step 1: Drag an image onto the upload box, or tap it to choose a JPG, JPEG, PNG or WebP file (up to 25 MB).
Step 2: Pick an output format. Keep the original, or choose WebP or JPG when you want the smallest possible file.
Step 3: Move the Quality slider. Lower values give smaller files; around 70 to 80 percent is a common starting point for photographs.
Step 4: Optionally set a maximum width if the image is larger than it needs to be for your page or form.
Step 5: Compare the original and compressed previews and sizes, then press Download.
Features and benefits
Runs in your browser
Your image is decoded, redrawn and re-encoded with the Canvas API on your own device. There is no upload, no queue and no waiting for a server.
Adjustable quality
A live slider lets you trade file size against detail and see the effect immediately, instead of guessing from fixed presets.
JPG, PNG and WebP
Works with the three formats most websites use, and can convert between them while it compresses.
Optional resizing
Camera photos are often thousands of pixels wide. Setting a maximum width is usually the biggest single saving you can make.
Honest results
You see exact before and after sizes. If the new file would be larger than the original, the tool says so rather than hiding it.
How the image compressor works
Your browser decodes the picture into raw pixels, draws it onto an off-screen canvas and then asks its built-in encoder to save it again as JPG, PNG or WebP. For JPG and WebP the encoder accepts a quality value; lower values discard more fine detail, which is why the file becomes smaller. This is lossy compression, so every time you re-compress an already compressed image you lose a little more detail. Always keep your original file.
PNG behaves differently. It is a lossless format, so there is no quality setting for it, and re-encoding a PNG usually changes the size only slightly. If you need a much smaller file from a PNG that does not need transparency, choose JPG or WebP as the output.
Choosing a good quality setting
There is no single perfect value because it depends on the picture. Photographs with natural texture tolerate strong compression better than screenshots or graphics with sharp text. Start around 70 to 80 percent, zoom into the preview and lower the slider until you can just begin to see blocky patches or fuzzy edges, then raise it one notch.
Resizing matters as much as quality. An image shown 800 pixels wide on a page does not need to be 4,000 pixels wide. Reducing the dimensions to what you really need removes pixels entirely, which no quality setting can match.
Privacy and limits
Because everything happens locally, your pictures are never sent to FreeToolsHub. The practical limit is your device's memory: we accept files up to 25 MB and refuse images with an extreme number of pixels. If a very large image fails on a phone, try a desktop browser or a smaller version.
Photo metadata such as camera model or GPS location is not carried into the compressed file, because the browser draws fresh pixels. The colour profile may also be converted to standard sRGB. That can be a privacy benefit when sharing photos, but keep your original if you need the metadata.
Example use cases
Faster web pages
Shrink hero images and blog photos before uploading them to your site so pages load quickly on mobile data.
Email and chat attachments
Get photos under an attachment limit without installing anything.
Online forms and portals
Many job, school and government portals set a maximum size for uploaded photos or scanned documents.
Online shops
Product galleries with dozens of pictures stay fast when every photo is optimised first.
Frequently asked questions
Is the image compressor really free?
Yes. There is no limit on how many images you compress, no watermark and no sign-up.
Will my image be uploaded to a server?
No. The image is processed inside your browser using the Canvas API and is never transmitted to FreeToolsHub or anyone else.
Why did my PNG barely get smaller?
PNG is a lossless format with no quality setting, so re-saving it rarely shrinks it much. Choose WebP or JPG as the output format, or resize the image, for a bigger reduction.
Which format gives the smallest file?
For photographs, WebP is usually the smallest, followed by JPG. WebP is supported by all current major browsers. For graphics with flat colours or transparency, WebP or PNG are the better choices.
Does compression reduce image quality?
JPG and WebP compression is lossy, so some detail is discarded. At moderate settings the difference is often hard to see, but use a higher quality for important images and always keep the original.
Related tools
Useful guides
- How to Compress Images Without Losing QualityLearn how to shrink JPG, PNG and WebP files without visible quality loss: resize first, choose the right format, tune quality and always compare the result.
- Why Image Compression Matters for Website SpeedSee how oversized images slow pages, affect Core Web Vitals and frustrate mobile visitors, and how to fix it: resize, pick formats, compress and lazy load.
- JPG vs PNG vs WebP: Which Image Format Should You Use?Compare JPG, PNG and WebP on quality, file size, transparency and compatibility, with a simple guide to choosing the right image format for every situation.
Last updated 7 November 2026.