Compress Images Online
Compress JPG, PNG and WebP images on your device. Process a batch, compare real file sizes and download the results without signing up.
Free · No signup · No watermark · On-device processing
Choose images
Select multiple files for a batch. Choosing again replaces the current selection.
JPG/WebP quality may decrease. PNG follows the selected palette mode. Dimensions change only when allowed. If the target cannot be reached, no over-target file is offered as a success.
How to compress images
- Select one or more supported images.
- Choose quality/PNG settings or Fit under a target size. Enter a maximum KB size if targeting.
- Optionally allow smaller dimensions when the target needs fewer pixels.
- Compress, compare actual bytes and dimensions, and download the successful results.
Choose the right kind of compression
JPEG and WebP use adjustable lossy encoding: lowering quality can reduce file size but also changes pixels. Start near the default, inspect a downloaded image at full size, and lower quality only if the result is acceptable. Pixel dimensions remain unchanged; use Resize Image when you also need fewer pixels.
PNG works differently. Lossless optimization preserves decoded image pixels, including transparency. The optional reduced-colour mode may make graphics smaller by simplifying their palette, which can affect gradients and fine detail. An already optimized file may not shrink. If an attempted compression is larger, the tool offers the original and tells you why.
Process batches without uploading them to Varento Tools. Large batches and very large photos still need device memory. Keep your originals, especially when an image contains an embedded colour profile or animation: browser-based processing can change colour handling and this tool exports still images.
Target-size mode aims for a maximum, not an exact byte count. One KB means 1,024 bytes here. JPEG and WebP search for a quality setting within the target. PNG follows your selected lossless or reduced-palette mode. Smaller dimensions are used only if you explicitly enable them. If the target cannot be met, the tool shows an error instead of offering an over-target file as a success. An unchanged original that is already small enough can retain its original metadata.
Need exact pixel dimensions too? Use Resize Image.
Privacy and browser support
Your input is handled in this browser tab. Selected files and entered text are not sent to Varento Tools by this tool. Some specialized libraries load only when needed. A browser with JavaScript and sufficient device memory is required. Read our local-processing explanation.
Related tools
Frequently asked questions
Is this tool free without daily usage limits?
Yes. Varento Tools has no signup, accounts, usage-count caps, paywalls or watermarks. Device memory, format support and browser restrictions can still limit technically demanding files.
Does compression always make an image smaller?
No. A small or already optimized image can grow when re-encoded. We compare actual bytes and keep the original when compression does not help.
Are the dimensions changed?
Dimensions remain unchanged by default. In target-size mode, they may decrease only if you enable Allow smaller dimensions.
Can I compress several images?
Yes. Select multiple supported images, then download them separately or build a ZIP after processing.
Is PNG optimization lossless?
The default PNG mode preserves decoded pixels. Reduced-colour mode is optional and may change colours; metadata and animation are separate from pixel fidelity.