Skip to content
ToolsNow
Images

Image Compressor: Reduce Image File Size

Make a picture smaller for an upload limit or easier sharing. Try quality, format and size changes, then compare the result before saving.

Runs in your browser — your input is not uploaded to ToolsNow.

Loading your workspace…

Compare two quality settings

Open the practice HEIC card and choose JPG. Try 85% quality, then a lower setting, comparing the lettering and File size each time. The transparent PNG also shows why changing format can change the background.

Follow the worked example →

ToolsNow practice files with fictional details, free to download and reuse.

How to use

  1. Choose images. Open one picture or a batch, then select the picture you want to inspect.
  2. Try a smaller export. Choose an accepted format under Save as and lower Quality gradually. Compare original lets you judge the change; PNG has no lossy quality slider.
  3. Resize if needed. Reduce dimensions when the source is larger than the destination needs. Check the actual File size rather than relying on a percentage setting.
  4. Download and inspect. Save the selected picture or prepare a ZIP. Open the download to check the details that matter at its intended viewing size.

Questions

How do I get below an upload limit such as 200 KB?

Watch File size while lowering Quality, then reduce dimensions in Resize if needed. There is no exact target-size setting. Check lettering and faces in the result, and leave a little room below the destination’s limit.

Why is the result larger?

The source may already be well compressed, or your new format may be less efficient for this picture. PNG often makes photos larger. Compare JPG or WebP where accepted, and keep the original if a new export offers no useful saving.

Can I raise quality again without damaging the original?

Yes. Each preview is made again from the loaded source with your current edits. That differs from opening a previously compressed download: lost detail in that file cannot be restored by increasing quality.

Does PNG preserve everything?

It avoids lossy compression of the rendered pixels, but this workspace still makes one flattened, 8-bit still image. Animation, layers and high-bit-depth data do not survive, and source profiles and metadata are stripped. Keep the original for those features.

Can I compress several pictures locally?

Yes. Prepare all as ZIP applies the same settings to every picture, so check a mix of images before saving the batch. The files are processed on your device; loading the processor and other site resources can still use the network.

Examples and checks

Open an image, choose an output format and compare it with the original. If changing quality is not enough, reduce the dimensions in the same workspace.

A photo for a web page

Input or situation
A large photograph; reduce its dimensions and compare JPEG or WebP quality settings.
Result
An image to inspect at its intended display size.

Halving width and height leaves one quarter of the pixels. Check the actual file size too; it will not necessarily fall by the same proportion.

A logo with transparency

Input or situation
An image with transparent edges
Result
Choose PNG or WebP when the transparency must remain.

JPEG cannot store transparency. Check edges against both a light and a dark background before publishing.

Before you use the result

Published by ToolsNow. How tools and sources are checked · Report a problem

Read more

Guide How to convert HEIC photos to JPG without uploading them Convert one HEIC photo or a batch to JPG, choose quality and dimensions, and understand what happens to Live Photos, HDR and metadata. Guide JPEG vs PNG: a practical rule that covers almost every case Start with JPEG for photos and PNG for sharp text or transparency, then compare the saved result. Practical advice on quality, backgrounds and newer formats. Guide What DPI actually means (and which number to pick) Choose a PDF export resolution or work out an image's print size. Learn when changing DPI adds pixels and when it only changes a printing instruction.

Related tools

Image cropper Crop a picture by dragging, using a preset or entering percentages. Image format converter Convert, resize, crop and compress images in one workspace. Rotate & flip image Turn pictures in 90-degree steps or make a mirror image. Favicon generator Make six square icon sizes from one image. Image to Base64 Convert an image to a data URI, with CSS and HTML snippets. Color picker from image Sample a colour from a picture and copy its HEX value.