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Image Tools · Updated October 17, 2026

Image Compressor

You can compress JPG, PNG and WebP images in your browser for free. Choose a quality level and an optional maximum dimension, then compare the before and after size before downloading.

Runs in your browserFree · No sign-up · No watermark
JPGPNGWebPJPG / PNG / WebPRuns in your browser
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Everything runs locally in this tab. No file is uploaded while the tool loads.

This tool runs in your tab. Nothing is uploaded and no copy is stored.

How files are handled

At a glance

Formats
JPG, PNG, WebP → JPG, PNG or WebP
Processing
In your browser
Max size
Up to 50 MB per image
Price
Free, no account
Updated
October 17, 2026
All Image Tools

About Image Compressor

Image compression is about trade-offs: every reduction in file size removes information the viewer may or may not notice. A sensible workflow is to start with a quality level around 70-80 and a maximum dimension that matches how the image will be displayed, then check the preview. A 4000-pixel photo that appears at 800 pixels wide rarely needs to keep its original dimensions.

This compressor decodes each image, optionally scales it down and re-encodes it as JPG, WebP or PNG at your chosen quality. The result list shows the original size, the new size and the percentage saved for every file, plus a total for the batch. Everything runs in your browser, so large batches never leave your device.

What this tool does

The details that matter when you use Image Compressor for real work.

  • Quality slider

    Set compression from 5 to 95 and see the effect on file size before you download anything.

  • Maximum dimension

    Cap the longest side at 2560, 1920, 1280, 1080 or 800 pixels, or keep the original size.

  • Before and after sizes

    Every result row reports the original and compressed size plus the percentage saved.

  • JPG, WebP or original format

    Convert to WebP for the smallest files, JPG for compatibility, or keep the input format.

  • Batch compression

    Compress up to 20 images in one run and download each result separately.

  • Transparency aware

    PNG and WebP transparency is kept for those outputs; JPG output is flattened onto white.

How to use Image Compressor

No account, no installation — the whole job happens in this browser tab.
  1. 01

    Add images

    Drop up to 20 files onto the picker; JPG, PNG and WebP are accepted.

  2. 02

    Set the quality level

    Move the slider down to reduce size. 70-80 is a good starting point for photographs.

  3. 03

    Optionally limit the dimensions

    Pick a maximum longest side so oversized photos are scaled down to a sensible width.

  4. 04

    Choose the output format

    WebP usually gives the smallest file, JPG the widest compatibility, and original keeps the input format.

  5. 05

    Compress and compare

    Check the before and after sizes in the result list, then download the files you are happy with.

Supported formats and limits

Input
JPGPNGWebP
Output
JPG, PNG or WebP
Processing
Client-side, in your browser. Nothing is uploaded.
Maximum size
Up to 50 MB per image
Requirements
Chrome, Edge, Firefox or Safari on desktop or mobile

Limitations worth knowing

  • Compression is lossy for JPG and WebP output; keep the originals if you may need full quality later.
  • PNG output is re-encoded losslessly and can end up larger than the original file.
  • Very large images or batches can exceed the memory a browser tab is allowed to use.

Privacy and file handling

Compression happens entirely in your browser. Your images never leave your device, are not uploaded to any server and are not stored by FormatFlow. The files are discarded when the tab is closed.

Read the full privacy policy

Image Compressor FAQ

Short, direct answers to the questions people ask before using this tool.
What quality setting should I use?
Start at 75 for photos. Product shots and faces usually look fine at 70-80; detailed artwork, text and night photos need 85 or more. Compare the output size and your own copy of the image before committing to a batch.
Why did my PNG get bigger instead of smaller?
PNG is lossless, so re-encoding it cannot throw away detail; a fresh PNG can even be larger than a carefully optimised original. Convert the image to WebP or JPG when size is the priority.
Does compression reduce the image dimensions?
Only if you choose a maximum dimension. Otherwise the pixel width and height stay the same and only the compression level changes.
Is it safe to compress personal photos here?
Yes. The images are decoded and re-encoded inside your browser tab and are never uploaded, so private photos never leave your device and no copy is stored.
What happens to transparent backgrounds?
They are preserved when the output is WebP or PNG. JPG cannot store transparency, so choosing JPG fills transparent areas with white.
Does the compressor remove EXIF data?
Yes. Re-encoding through the canvas drops EXIF, GPS and camera metadata, which also makes phone photos a little smaller. Orientation is applied before encoding so photos stay upright.
How many files can I compress at once?
Up to 20 files per batch and 50 MB each. A very large batch may exceed the memory available to the browser tab, especially on phones.
Can I compress images without visible quality loss?
Often, yes, because cameras and editors store more data than screens can show. There is no fixed threshold; it depends on the image, so compare the result sizes and the picture itself to find the point where quality still looks right.

Background reading

Format guides that explain the trade-offs behind Image Compressor.