Image tools
Compress image online
Reduce JPG/PNG size with visible quality control.
Run Compress image online online
In-browserDocument processing runs on your device. External resources may still load.
Enable JavaScript to use the interactive tool. Read the instructions, limitations and FAQs below before starting.
Image compression reduces the file size of photographs, graphics, and screenshots while maintaining an acceptable level of visual quality. Compressed images load faster on websites, take less storage space, are easier to share via email and messaging apps, and meet the file size requirements of upload portals.
This tool compresses JPEG, PNG, WebP, and GIF images using format-appropriate algorithms. JPEG compression uses quality factor reduction with careful chroma subsampling; PNG compression uses lossless deflate optimisation and optional quantisation to reduce colour depth. The result is a significantly smaller file that looks nearly identical to the original on screen.
Web developers use image compression to improve page load speed (images are typically the largest page elements). Photographers use it to reduce gallery storage size. Form applicants use it to meet portal upload limits. Social media users use it to upload images within platform size limits without auto-compression artifacts from the platform itself.
How to use this utility
- Use the controls below—paste text, pick files, or adjust options as described on the tool.
- Click the main action button. Processing runs in your browser on this device.
- Download or copy the output. Check the processing note for any external services used by this operation.
Common use cases
- Reducing product photos for an e-commerce website to improve page speed scores.
- Compressing a profile photo to under 50 KB for a job portal upload.
- Shrinking a screenshot or screen recording frame for inclusion in a report or presentation.
- Reducing WhatsApp shared images to maintain quality while keeping file size under 5 MB.
- Compressing a batch of event photos before archiving to reduce storage usage.
Tips for best results
- 1For JPEG images, 75–85% quality is typically indistinguishable from the original on screen and reduces file size by 50–70%.
- 2PNG files with limited colour palettes (icons, logos, screenshots with flat colours) compress extremely well using palette quantisation — try this for PNGs before considering JPEG conversion.
- 3Convert PNG photographs to JPEG before compressing — JPEG achieves 5–10x better compression than PNG for photographic content.
- 4Use WebP format for web images — it provides 25–30% smaller files than JPEG and PNG at equivalent quality.
- 5After compression, view the image at 100% zoom before using it — artefacts visible at 100% will be visible in the final use context.
Frequently asked questions
- Is Konnect2Tools free?
- Yes. These in-browser tools are completely free to use with no account required for core functionality.
- Do my files leave my device?
- Browser document operations run locally, except where the operation uses an external service, such as AI summarisation. Read the processing note before using sensitive inputs.
- Is the Compress image online tool safe to use?
- Local operations process document content on your device. External-service operations may send inputs as described in the processing note. Keep originals and inspect the output.
- What is the difference between lossless and lossy compression?
- Lossless compression (PNG, GIF) reduces file size without any loss of image data — the decompressed image is identical to the original. Lossy compression (JPEG, WebP) permanently discards some image data to achieve much higher compression ratios, with the discarded detail generally invisible to the human eye.
- Should I use JPEG or PNG for my photos?
- JPEG is best for photographs, complex scenes, and images with many colours. PNG is best for screenshots, graphics, logos, and images with large flat-colour regions, sharp edges, or transparency. Using JPEG for photographs and PNG for graphics gives the best size-quality ratio for each type.
- How much can I expect to reduce my image file size?
- Typical reductions: JPEG photos by 40–70%, PNG screenshots by 50–80% (more with colour reduction), and PNG photos converted to JPEG by 70–90%. Actual savings depend on the original image's content and any existing compression.
- Will compression affect the image dimensions (pixels)?
- No — compression changes quality and file size, not dimensions. The output image has the same pixel width and height as the original. For dimension changes, use the Bulk Resize Images tool.
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