Print Size Photo Editor for Professional Labs

Professional photo labs have strict specifications that consumer labs do not enforce as rigidly. WHCC, Millers, Bay Photo, and Mpix expect files at exactly 300 DPI at the ordered size, encoded in sRGB colour space, saved as JPG at a quality level that balances file size with fidelity. Uploading a phone photo at the wrong DPI or the wrong colour space still prints but loses some sharpness or comes back with a colour shift. Professional photographers doing volume orders cannot afford that inconsistency, so pre-preparing files to exact spec is standard workflow.

This tool handles that preparation in one step. Pick the print size (eight-by-ten, eleven-by-fourteen, sixteen-by-twenty, twenty-by-twenty-four, and so on), pick the aspect if the source does not match, and the tool outputs a file at exactly the expected pixel dimensions and 300 DPI in sRGB. The output drops into any professional lab's upload form without triggering any warnings or silent re-scaling. For photographers delivering client orders, this is the single highest-leverage efficiency improvement in the lab-delivery workflow.

The alternative is preparing each file in Lightroom or Photoshop with the correct export settings, which takes significantly longer for volume work. This tool is the light-weight version for photographers who have the RAW processing done in Lightroom and just need the lab-ready JPG exported fast. Drop the high-res JPG from Lightroom here, pick the print size, get the lab-ready file, upload. That is the whole flow and it scales to dozens of orders per session.

WHCC expects 300 DPI at the ordered size, sRGB, JPG at 100 percent quality (or TIFF for highest fidelity). Millers has similar specs, with an explicit recommendation against uploading at higher than 300 DPI because they downscale rather than letting their algorithm decide. Bay Photo and Mpix mirror these specifications. The baseline expectation across all professional labs is: exact pixel dimensions, 300 DPI, sRGB, JPG or TIFF. Getting any of these wrong either triggers re-upload prompts or silently degrades the final print.

Colour space matters more than most people realise. If you edit in Adobe RGB (common for print work), your files look vibrant on your calibrated monitor but get colour-shifted when printed by a lab that expects sRGB. The shift usually makes colours look muted and slightly desaturated. This tool converts colour space on export, so the file uploaded to the lab is already sRGB and the print matches what you expect from the monitor preview.

File quality for JPG output needs to be high but not maximum. At 100 percent JPG quality, file sizes balloon without any visible benefit on paper. At 90 percent, files are about a third smaller with indistinguishable print quality. The tool defaults to 95 percent as a safe balance. For archival-quality print work, TIFF output is also available, which is lossless at the cost of files several times larger.