Large images fail uploads, bounce email, and slow pages down. Dropping quality all the way often makes the picture look bad, and you have to start over from the original.
Decide what you need first
Chat thumbnails, homework portals, product photos, and print posters need different levels of clarity. Chat images can be smaller; print or projection may need a larger file. Aim for good enough, not the smallest possible.
Common limits: many mailboxes reject attachments over 10–25MB; some school portals allow 5–20MB per file; phone originals are often many megabytes when 1–2MB would upload fine.
If someone asks for the “original” or “HD,” clarify whether they mean enough pixels or an uncompressed file. Many portals just need a usable longest edge.
Order: format, size, then quality
Photos usually work well as JPEG or WebP. Keep transparency with PNG or WebP. Screenshots with flat colors sometimes work better as PNG. Convert first if you need a specific format.
If the image is very large in pixels, shrink the longest edge to 1920 or 1280 before lowering quality. Small images get blurry fast when you cut quality hard.
Try 75–85% quality first. Check text, faces, and flat areas in the preview, then check the file size. Stop when you meet the limit. Avoid compressing the same JPEG again and again.
Text, tables, and formulas show compression sooner than landscapes. Raise quality a bit, or crop empty margins before you compress.
Start from the original
Process from the original each time. Re-compressing an already compressed JPEG stacks artifacts. Keep a backup of important files.
Image Compress supports multi-select. Compare sizes in the result list, then download one file or a ZIP. Files are processed in your local browser and are not uploaded to our servers.