Reduce an image file size with a quality slider, watching the saving update as you go. Nothing is uploaded, so this is safe for anything private.
Runs in your browser — your input is not uploaded to ToolsNow.
Your files are processed locally in your browser and are not uploaded to ToolsNow.
JPEG and WebP are lossy — quality lost at one setting cannot be recovered by raising it again. Keep your original. WebP typically produces files 25–35% smaller than JPEG at matching quality.
0.75 to 0.85 is the usual sweet spot for photographs — a large saving with no difference most people can see. Below about 0.6 you start to see blocking around edges and in flat areas like skies.
No. JPEG and WebP are lossy, and detail discarded at one setting cannot be recovered by raising the slider again — you would just re-encode the already-degraded image. Always keep your original.
PNG is lossless, so the quality slider does nothing for it and re-encoding can produce a larger file than a well-optimised original. For photographs, convert to JPEG or WebP instead.
For the web, yes — it is supported by every current browser and is meaningfully smaller than JPEG. Stick with JPEG if the file is going somewhere older, or into software that may not accept WebP.
Choose an output format for the image’s contents, then compare both appearance and file size. Lower quality is useful only while the exported image still meets the purpose you need it for.
Halving width and height leaves one quarter of the pixels. File size does not follow that ratio exactly because compression also depends on image detail and format.
JPEG cannot store transparency. Check edges against both a light and a dark background before publishing.
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