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FileTools360
ImageAdjustable qualityRuns in your browser

Compress Image

Shrink photos for the web without an obvious drop in quality. Some detail is discarded to fit the target format; how much depends on the format and your settings.

Not uploaded to any serverConverted on this deviceGone when you close the tabHow this works

Drop your files here

JPG, PNG, WebP, AVIF and 5 more formats · up to 120 MB each

or paste files from your clipboard

Ready when you are

Shrink photos for the web without an obvious drop in quality. Everything happens in this tab; nothing is sent anywhere.

⌘K to search converters

How to use it

  1. 1

    Add your files

    Compress Image works with JPG, PNG, WebP, AVIF, TIFF, BMP, HEIC, HEIF and GIF. Drop them in, browse for them, or paste from your clipboard.

  2. 2

    Choose your options

    Tune quality and metadata removal — or leave the defaults, which are sensible.

  3. 3

    Run it and download

    Press the button and save the result. Everything happens on your device, and nothing is uploaded.

Privacy, in plain words

Is it safe? Your image is not uploaded anywhere

What “uploaded” normally means. On most online converters, pressing the button copies your file across the internet onto a computer owned by that website. That copy is what the word “upload” means, and it is the part nobody explains.

What happens instead. This site does not do it. There is no server here that receives files, so your image is read, converted and handed back by the browser you are using right now. It never travels — so there is no copy to store, read, leak or hand over.

Check it yourself in ten seconds

Turn off your Wi-Fi after this page has loaded, then convert a file anyway. It still works, because everything needed is already on your device.

The longer explanation of how this works, and the full detail of what is and is not stored on the privacy page.

Why this matters more than it sounds

Photographs carry more than what is in the frame — most also carry the time, the device and often the GPS coordinates where they were taken. It matters more than it sounds, because of what images usually are:

Screenshots of bank transfers

account details, and proof of what you paid whom

Medical scans and photographs

X-rays, results, images of a condition

Photographs of children

family pictures that should stay in the family

Passport and visa photos

biometric-grade images of your face

A file that is never sent cannot be kept, leaked, subpoenaed or used to train anything. That is a property of how this works, not a promise about how carefully it is run.

What compression removes

Lossy image compression discards the detail your eye is least likely to notice — fine variation in areas of similar colour, and precision in colour rather than brightness, because human vision is far more sensitive to the second. At sensible settings the result is hard to tell from the original; pushed too far, it produces the blocky smearing everyone recognises.

The quality setting decides how much is thrown away, and it is not a percentage of anything. Quality 80 does not mean the image is 80% as good; it means the encoder was told how aggressive to be.

Photographs compress well
Gradients and texture are exactly what the format was designed for.
Screenshots and logos do not
Hard edges and flat colour are the worst case. Those often come out both larger and visibly worse — a lossless format is the right answer for them.
Compressing twice compounds
Each pass discards more, permanently. Always start from the original rather than from a file you compressed last week.

The lever most people forget

Dimensions usually matter more than quality. A 4000-pixel photo displayed at 800 pixels wide is carrying twenty-five times more data than the screen can show, and no quality setting recovers that waste — resizing it does, instantly and without any visible loss.

If a file is too large, try the size first and the quality second. It is the difference between an image that is smaller and one that is smaller and still sharp.

Measured, not estimated

What this tool actually does to a file

Compressing a photograph at the default Recommended setting. This is the one the Node benchmark could not do: the work is a quality search, and reproducing it outside a browser would have measured a different algorithm.

On every sample measured, the result came out smaller — 4% smaller at worst and 18% smaller at best.

Each row is one document, chosen because this tool behaves differently depending on what is inside the file.
SampleInOutChange
An easy clipThe compressible end of the range — a clean tone, or a moving test pattern — where a codec does its best work.12.5 KB12.0 KB−4%
A hard clipThe other end — pink noise, or dense video grain. Close to incompressible by design, and the worst case for every codec.209 KB172 KB−18%

Produced by this site's own converter. The same code that runs in your browser, at the same default settings, so these are the bytes you would download.

Samples are generated from a fixed seed rather than taken from real photographs or documents, so the corpus is reproducible and carries no licensing question — and so the numbers predict the shape of your result rather than its exact size. Measured 2026-10-01. The method, and the command that regenerates every figure on this page, are on the how it works page.

About these formats

Accepts

JPEG Image

The universal lossy photo format.

Extensions
.jpg, .jpeg, .jpe, .jfif
MIME type
image/jpeg
Best for
Photographs · Email and messaging · Maximum compatibility
Compatibility
Opens everywhere — every browser, OS and device.

Accepts

Portable Network Graphics

Lossless image format with full alpha transparency.

Extensions
.png
MIME type
image/png
Best for
Transparency · Graphics and logos · Screenshots
Compatibility
Universally supported.

Compression is lossy and cannot be undone — keep your originals. If a file is already well compressed, FileTools360 keeps the smaller of the two results rather than making it bigger.

Good to know

Compress Image — questions

How does Compress Image work?

Shrink photos for the web without an obvious drop in quality. Add your files above, adjust anything you want to change, and press the button. The result downloads straight to your device.

Is there anything I should watch out for?

Compression is lossy and cannot be undone — keep your originals. If a file is already well compressed, FileTools360 keeps the smaller of the two results rather than making it bigger.

Is Compress Image safe — are my files uploaded to a server?

No, nothing is uploaded. On most online tools, pressing the button copies your file across the internet onto a computer owned by that website, where it is processed and then sent back. That copy is what "upload" means. This tool does not do it: your file is read and processed by the browser you are using right now, stays on this device the whole time, and is discarded when you close the tab. Turn off your Wi-Fi after the page loads and it still works, which is the quickest way to confirm it.

Can I use this on confidential or personal documents?

Yes — that is the case it was built for. Because the file never leaves your device, a confidential document is no more exposed than it is sitting in your own folder: there is no transfer, no copy on anybody else's hardware, no retention period and no staff with access. Nothing about the file is logged either — not its name, not its size, not its contents.

Do I need an account?

No. Every tool on FileTools360 works without signing up, and there is no watermark on the output.

What is the file size limit?

120 MB per file. Since everything runs locally, your device's available memory is the real constraint.

Read more about these formats

We Measured What Image Formats Actually Cost

Five test images, four formats, five quality settings, and the numbers that came out — including the case where lossless compression beats every lossy encoder.

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FileTools360 by the numbers

527 converters and tools65 file formatsnothing ever uploaded.