A colleague on the move needs to choose one of ten photographs. Sending the originals up front can make a simple decision take much longer. Start with a small selection and offer the larger files after the choice or through a separate link. The recipient can decide first and download only what they need.

Give the preview a purpose

A preview should show the subject, framing, and details needed for the first look. It need not meet print requirements. Try a long edge of 800–1200 pixels for a phone as a starting range. If a small label or defect matters, add a separate close-up instead of making every overview larger.

Check the actual bytes

Read the pixel dimensions and file size separately. At one megabit per second, a 250 kB file takes about two seconds to transfer in an ideal calculation. Server delay, competing requests, and unstable reception can make the real wait longer. Check the heaviest file alongside the average.

Make the two links clear

Label the preview and the full-size download in your message. Include the approximate size of the full file and when it is needed. A recipient using mobile data can wait until Wi-Fi is available. Give both links the intended permissions and try them in a separate session.

Open the files as a recipient

View the preview at a normal size on a phone. If the detail needed to make a choice is unreadable, send a separate crop of that area. Download a full copy and check that it matches its preview. When the two files share a base name, use suffixes that identify their roles.

Plan the delivery around what the recipient needs to do

Imagine sharing a photo of a whiteboard from a workshop. A distant colleague may only need an overview of the drawing, while another needs to read the measurements at the edge. The same small preview will not work for both. Instead of enlarging the entire file, you can prepare a close-up of the measurements and include the full board for context. Add a short note that explains the role of each image. Try the link on your usual connection, then open it once on a phone in a place with weak reception. If the preview appears quickly but the full image takes a long time, give the download size next to the link. The recipient can choose to wait for a better connection. In a group of photos, put the most useful one first. Letting someone reach the important picture without waiting for an entire album can help more than another round of compression.

Run a small export comparison

Make two versions of the same photo and open both on the type of screen the recipient will use. If text stays sharp in one copy but becomes hard to read in the other, choose the readable one. If both show what matters, send the smaller file. On an image dominated by flat colours or shadows, look for new steps in a smooth gradient. Fine lines and small numbers can also disappear in a resize. Start each export from the master. Exporting from your earlier small copy makes it difficult to tell which setting caused a change. When a test works, record the dimensions and format. Before applying the settings to a new batch, choose one representative picture and check it again. A dense document and a landscape with an open sky can behave differently at the same setting. Label the files so a recipient can tell which one is an overview and which one carries the detail. If they need the original later, keep its location in your delivery notes.