Compress images for mail without throwing away the original
A picture is not a PDF page
Image compress is for a PNG, JPEG, or similar picture you want to attach to a message. It is not PDF compress. Wrapping a photo in a one-page PDF and then flattening that PDF is two losses. Start from the camera file or the export you actually like. The page can crop, set a long edge or an exact size, and write JPEG, PNG, or WebP. JPEG at a moderate quality is the usual choice for a photograph in email. WebP is smaller in browsers that accept it and useless for a recipient whose mail client will not show it. PNG keeps sharp edges and stays large, which is why a screenshot of text often should remain PNG.
Batch compress on its own page is for several pictures that should land in one ZIP, each pushed toward a size you can attach. It is still local. NexTool does not upload the album. Open two or three results before you send the ZIP. One muddy photo means the quality was too low for the whole set. Raise it and run again from the originals. Do not batch-compress the already compressed ZIP contents. The PDF guide is the wrong essay if your file is a picture. This one is the wrong essay if your file is a multi-page scan.
Keep a sharp copy
Mail clients resize again. A file that looked fine in the tool can look soft after the mailbox makes a preview. That is another reason to keep the original on disk. NexTool will not have it. Crop before you compress if the subject is a small part of a wide photo. Compressing the empty background spends quality on pixels you meant to cut. HEIC from a phone may need a conversion the browser can do locally. If the browser cannot encode the format you chose, the tool falls back to PNG rather than pretending the export is WebP. Read the downloaded file’s type before you rename it.
Practice on the poster, then use your photo
The public sample is a 640 by 400 PNG. Open it on image compress, export JPEG near the starting quality, and look at the edges before you touch a personal photo. That practice costs nothing private. When you switch to your own picture, crop first, then choose JPEG for a photograph, PNG for a screenshot or a diagram, and WebP only when the recipient can open it. If the browser cannot encode the choice, you get PNG. Read the real type. Raise quality and repeat from the camera original when faces or small type break up. Several pictures belong in batch. A PDF scan belongs in PDF compress. None of these uploads the file to NexTool. The download is the copy you keep, and the original stays in the folder you opened it from until you delete it yourself.
Do not overwrite the camera file
Rename the download so it does not overwrite the camera original. A studio photo.jpg and the camera photo.jpg are not the same file. If the export is softer than you can send, delete that export and try again from the original at a higher quality. The page will not keep a history of the attempts.